45f3d1a095
This is done to get the target path for the overlay nodes which is very useful in many cases. For example, Xen hypervisor needs it when applying overlays because Xen needs to do further processing of the overlay nodes, e.g. mapping of resources(IRQs and IOMMUs) to other VMs, creation of SMMU pagetables, etc. Signed-off-by: Vikram Garhwal <fnu.vikram@xilinx.com> Message-Id: <1637204036-382159-2-git-send-email-fnu.vikram@xilinx.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2147 lines
75 KiB
C
2147 lines
75 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
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#ifndef LIBFDT_H
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#define LIBFDT_H
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/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*/
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#include <libfdt_env.h>
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#include <fdt.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define FDT_FIRST_SUPPORTED_VERSION 0x02
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#define FDT_LAST_COMPATIBLE_VERSION 0x10
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#define FDT_LAST_SUPPORTED_VERSION 0x11
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/* Error codes: informative error codes */
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#define FDT_ERR_NOTFOUND 1
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/* FDT_ERR_NOTFOUND: The requested node or property does not exist */
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#define FDT_ERR_EXISTS 2
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/* FDT_ERR_EXISTS: Attempted to create a node or property which
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* already exists */
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#define FDT_ERR_NOSPACE 3
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/* FDT_ERR_NOSPACE: Operation needed to expand the device
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* tree, but its buffer did not have sufficient space to
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* contain the expanded tree. Use fdt_open_into() to move the
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* device tree to a buffer with more space. */
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/* Error codes: codes for bad parameters */
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#define FDT_ERR_BADOFFSET 4
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/* FDT_ERR_BADOFFSET: Function was passed a structure block
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* offset which is out-of-bounds, or which points to an
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* unsuitable part of the structure for the operation. */
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#define FDT_ERR_BADPATH 5
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/* FDT_ERR_BADPATH: Function was passed a badly formatted path
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* (e.g. missing a leading / for a function which requires an
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* absolute path) */
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#define FDT_ERR_BADPHANDLE 6
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/* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle.
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* This can be caused either by an invalid phandle property
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* length, or the phandle value was either 0 or -1, which are
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* not permitted. */
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#define FDT_ERR_BADSTATE 7
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/* FDT_ERR_BADSTATE: Function was passed an incomplete device
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* tree created by the sequential-write functions, which is
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* not sufficiently complete for the requested operation. */
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/* Error codes: codes for bad device tree blobs */
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#define FDT_ERR_TRUNCATED 8
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/* FDT_ERR_TRUNCATED: FDT or a sub-block is improperly
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* terminated (overflows, goes outside allowed bounds, or
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* isn't properly terminated). */
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#define FDT_ERR_BADMAGIC 9
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/* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
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* device tree at all - it is missing the flattened device
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* tree magic number. */
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#define FDT_ERR_BADVERSION 10
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/* FDT_ERR_BADVERSION: Given device tree has a version which
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* can't be handled by the requested operation. For
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* read-write functions, this may mean that fdt_open_into() is
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* required to convert the tree to the expected version. */
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#define FDT_ERR_BADSTRUCTURE 11
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/* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
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* structure block or other serious error (e.g. misnested
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* nodes, or subnodes preceding properties). */
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#define FDT_ERR_BADLAYOUT 12
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/* FDT_ERR_BADLAYOUT: For read-write functions, the given
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* device tree has it's sub-blocks in an order that the
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* function can't handle (memory reserve map, then structure,
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* then strings). Use fdt_open_into() to reorganize the tree
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* into a form suitable for the read-write operations. */
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/* "Can't happen" error indicating a bug in libfdt */
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#define FDT_ERR_INTERNAL 13
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/* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
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* Should never be returned, if it is, it indicates a bug in
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* libfdt itself. */
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/* Errors in device tree content */
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#define FDT_ERR_BADNCELLS 14
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/* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells
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* or similar property with a bad format or value */
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#define FDT_ERR_BADVALUE 15
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/* FDT_ERR_BADVALUE: Device tree has a property with an unexpected
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* value. For example: a property expected to contain a string list
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* is not NUL-terminated within the length of its value. */
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#define FDT_ERR_BADOVERLAY 16
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/* FDT_ERR_BADOVERLAY: The device tree overlay, while
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* correctly structured, cannot be applied due to some
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* unexpected or missing value, property or node. */
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#define FDT_ERR_NOPHANDLES 17
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/* FDT_ERR_NOPHANDLES: The device tree doesn't have any
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* phandle available anymore without causing an overflow */
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#define FDT_ERR_BADFLAGS 18
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/* FDT_ERR_BADFLAGS: The function was passed a flags field that
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* contains invalid flags or an invalid combination of flags. */
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#define FDT_ERR_ALIGNMENT 19
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/* FDT_ERR_ALIGNMENT: The device tree base address is not 8-byte
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* aligned. */
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#define FDT_ERR_MAX 19
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/* constants */
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#define FDT_MAX_PHANDLE 0xfffffffe
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/* Valid values for phandles range from 1 to 2^32-2. */
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/**********************************************************************/
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/* Low-level functions (you probably don't need these) */
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/**********************************************************************/
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#ifndef SWIG /* This function is not useful in Python */
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const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
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#endif
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static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
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{
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return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
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}
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uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
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/*
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* External helpers to access words from a device tree blob. They're built
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* to work even with unaligned pointers on platforms (such as ARMv5) that don't
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* like unaligned loads and stores.
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*/
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static inline uint16_t fdt16_ld(const fdt16_t *p)
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{
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const uint8_t *bp = (const uint8_t *)p;
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return ((uint16_t)bp[0] << 8) | bp[1];
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}
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static inline uint32_t fdt32_ld(const fdt32_t *p)
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{
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const uint8_t *bp = (const uint8_t *)p;
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return ((uint32_t)bp[0] << 24)
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| ((uint32_t)bp[1] << 16)
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| ((uint32_t)bp[2] << 8)
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| bp[3];
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}
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static inline void fdt32_st(void *property, uint32_t value)
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{
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uint8_t *bp = (uint8_t *)property;
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bp[0] = value >> 24;
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bp[1] = (value >> 16) & 0xff;
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bp[2] = (value >> 8) & 0xff;
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bp[3] = value & 0xff;
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}
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static inline uint64_t fdt64_ld(const fdt64_t *p)
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{
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const uint8_t *bp = (const uint8_t *)p;
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return ((uint64_t)bp[0] << 56)
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| ((uint64_t)bp[1] << 48)
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| ((uint64_t)bp[2] << 40)
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| ((uint64_t)bp[3] << 32)
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| ((uint64_t)bp[4] << 24)
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| ((uint64_t)bp[5] << 16)
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| ((uint64_t)bp[6] << 8)
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| bp[7];
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}
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static inline void fdt64_st(void *property, uint64_t value)
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{
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uint8_t *bp = (uint8_t *)property;
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bp[0] = value >> 56;
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bp[1] = (value >> 48) & 0xff;
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bp[2] = (value >> 40) & 0xff;
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bp[3] = (value >> 32) & 0xff;
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bp[4] = (value >> 24) & 0xff;
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bp[5] = (value >> 16) & 0xff;
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bp[6] = (value >> 8) & 0xff;
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bp[7] = value & 0xff;
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}
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/**********************************************************************/
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/* Traversal functions */
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/**********************************************************************/
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int fdt_next_node(const void *fdt, int offset, int *depth);
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/**
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* fdt_first_subnode() - get offset of first direct subnode
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* @fdt: FDT blob
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* @offset: Offset of node to check
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*
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* Return: offset of first subnode, or -FDT_ERR_NOTFOUND if there is none
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*/
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int fdt_first_subnode(const void *fdt, int offset);
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/**
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* fdt_next_subnode() - get offset of next direct subnode
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* @fdt: FDT blob
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* @offset: Offset of previous subnode
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*
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* After first calling fdt_first_subnode(), call this function repeatedly to
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* get direct subnodes of a parent node.
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*
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* Return: offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more
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* subnodes
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*/
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int fdt_next_subnode(const void *fdt, int offset);
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/**
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* fdt_for_each_subnode - iterate over all subnodes of a parent
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*
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* @node: child node (int, lvalue)
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* @fdt: FDT blob (const void *)
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* @parent: parent node (int)
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*
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* This is actually a wrapper around a for loop and would be used like so:
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*
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* fdt_for_each_subnode(node, fdt, parent) {
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* Use node
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* ...
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* }
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*
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* if ((node < 0) && (node != -FDT_ERR_NOTFOUND)) {
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* Error handling
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* }
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*
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* Note that this is implemented as a macro and @node is used as
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* iterator in the loop. The parent variable be constant or even a
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* literal.
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*/
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#define fdt_for_each_subnode(node, fdt, parent) \
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for (node = fdt_first_subnode(fdt, parent); \
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node >= 0; \
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node = fdt_next_subnode(fdt, node))
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/**********************************************************************/
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/* General functions */
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/**********************************************************************/
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#define fdt_get_header(fdt, field) \
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(fdt32_ld(&((const struct fdt_header *)(fdt))->field))
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#define fdt_magic(fdt) (fdt_get_header(fdt, magic))
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#define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize))
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#define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct))
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#define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings))
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#define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap))
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#define fdt_version(fdt) (fdt_get_header(fdt, version))
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#define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
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#define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
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#define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
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#define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
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#define fdt_set_hdr_(name) \
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static inline void fdt_set_##name(void *fdt, uint32_t val) \
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{ \
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struct fdt_header *fdth = (struct fdt_header *)fdt; \
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fdth->name = cpu_to_fdt32(val); \
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}
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fdt_set_hdr_(magic);
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fdt_set_hdr_(totalsize);
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fdt_set_hdr_(off_dt_struct);
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fdt_set_hdr_(off_dt_strings);
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fdt_set_hdr_(off_mem_rsvmap);
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fdt_set_hdr_(version);
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fdt_set_hdr_(last_comp_version);
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fdt_set_hdr_(boot_cpuid_phys);
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fdt_set_hdr_(size_dt_strings);
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fdt_set_hdr_(size_dt_struct);
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#undef fdt_set_hdr_
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/**
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* fdt_header_size - return the size of the tree's header
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* @fdt: pointer to a flattened device tree
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*
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* Return: size of DTB header in bytes
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*/
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size_t fdt_header_size(const void *fdt);
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/**
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* fdt_header_size_ - internal function to get header size from a version number
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* @version: devicetree version number
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*
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* Return: size of DTB header in bytes
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*/
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size_t fdt_header_size_(uint32_t version);
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/**
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* fdt_check_header - sanity check a device tree header
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* @fdt: pointer to data which might be a flattened device tree
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*
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* fdt_check_header() checks that the given buffer contains what
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* appears to be a flattened device tree, and that the header contains
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* valid information (to the extent that can be determined from the
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* header alone).
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*
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* returns:
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* 0, if the buffer appears to contain a valid device tree
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE,
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* -FDT_ERR_TRUNCATED, standard meanings, as above
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*/
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int fdt_check_header(const void *fdt);
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/**
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* fdt_move - move a device tree around in memory
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* @fdt: pointer to the device tree to move
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* @buf: pointer to memory where the device is to be moved
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* @bufsize: size of the memory space at buf
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*
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* fdt_move() relocates, if possible, the device tree blob located at
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* fdt to the buffer at buf of size bufsize. The buffer may overlap
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* with the existing device tree blob at fdt. Therefore,
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* fdt_move(fdt, fdt, fdt_totalsize(fdt))
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* should always succeed.
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*
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* returns:
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* 0, on success
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* -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings
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*/
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int fdt_move(const void *fdt, void *buf, int bufsize);
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/**********************************************************************/
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/* Read-only functions */
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/**********************************************************************/
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int fdt_check_full(const void *fdt, size_t bufsize);
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/**
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* fdt_get_string - retrieve a string from the strings block of a device tree
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* @fdt: pointer to the device tree blob
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* @stroffset: offset of the string within the strings block (native endian)
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* @lenp: optional pointer to return the string's length
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*
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* fdt_get_string() retrieves a pointer to a single string from the
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* strings block of the device tree blob at fdt, and optionally also
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* returns the string's length in *lenp.
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*
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* returns:
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* a pointer to the string, on success
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* NULL, if stroffset is out of bounds, or doesn't point to a valid string
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*/
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const char *fdt_get_string(const void *fdt, int stroffset, int *lenp);
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/**
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* fdt_string - retrieve a string from the strings block of a device tree
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* @fdt: pointer to the device tree blob
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* @stroffset: offset of the string within the strings block (native endian)
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*
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* fdt_string() retrieves a pointer to a single string from the
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* strings block of the device tree blob at fdt.
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*
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* returns:
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* a pointer to the string, on success
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* NULL, if stroffset is out of bounds, or doesn't point to a valid string
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*/
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const char *fdt_string(const void *fdt, int stroffset);
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/**
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* fdt_find_max_phandle - find and return the highest phandle in a tree
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* @fdt: pointer to the device tree blob
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* @phandle: return location for the highest phandle value found in the tree
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*
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* fdt_find_max_phandle() finds the highest phandle value in the given device
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* tree. The value returned in @phandle is only valid if the function returns
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* success.
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*
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* returns:
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* 0 on success or a negative error code on failure
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*/
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int fdt_find_max_phandle(const void *fdt, uint32_t *phandle);
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/**
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* fdt_get_max_phandle - retrieves the highest phandle in a tree
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* @fdt: pointer to the device tree blob
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*
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* fdt_get_max_phandle retrieves the highest phandle in the given
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* device tree. This will ignore badly formatted phandles, or phandles
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* with a value of 0 or -1.
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*
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* This function is deprecated in favour of fdt_find_max_phandle().
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*
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* returns:
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* the highest phandle on success
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* 0, if no phandle was found in the device tree
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* -1, if an error occurred
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*/
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static inline uint32_t fdt_get_max_phandle(const void *fdt)
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{
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uint32_t phandle;
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int err;
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err = fdt_find_max_phandle(fdt, &phandle);
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if (err < 0)
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return (uint32_t)-1;
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return phandle;
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}
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/**
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* fdt_generate_phandle - return a new, unused phandle for a device tree blob
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* @fdt: pointer to the device tree blob
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* @phandle: return location for the new phandle
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*
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* Walks the device tree blob and looks for the highest phandle value. On
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* success, the new, unused phandle value (one higher than the previously
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* highest phandle value in the device tree blob) will be returned in the
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* @phandle parameter.
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*
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* Return: 0 on success or a negative error-code on failure
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*/
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int fdt_generate_phandle(const void *fdt, uint32_t *phandle);
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/**
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* fdt_num_mem_rsv - retrieve the number of memory reserve map entries
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* @fdt: pointer to the device tree blob
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*
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* Returns the number of entries in the device tree blob's memory
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* reservation map. This does not include the terminating 0,0 entry
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* or any other (0,0) entries reserved for expansion.
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*
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* returns:
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* the number of entries
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*/
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int fdt_num_mem_rsv(const void *fdt);
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/**
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* fdt_get_mem_rsv - retrieve one memory reserve map entry
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* @fdt: pointer to the device tree blob
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* @n: index of reserve map entry
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* @address: pointer to 64-bit variable to hold the start address
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* @size: pointer to 64-bit variable to hold the size of the entry
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*
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* On success, @address and @size will contain the address and size of
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* the n-th reserve map entry from the device tree blob, in
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* native-endian format.
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*
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* returns:
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* 0, on success
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings
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*/
|
|
int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
|
|
|
|
/**
|
|
* fdt_subnode_offset_namelen - find a subnode based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to locate
|
|
* @namelen: number of characters of name to consider
|
|
*
|
|
* Identical to fdt_subnode_offset(), but only examine the first
|
|
* namelen characters of name for matching the subnode name. This is
|
|
* useful for finding subnodes based on a portion of a larger string,
|
|
* such as a full path.
|
|
*
|
|
* Return: offset of the subnode or -FDT_ERR_NOTFOUND if name not found.
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
|
|
const char *name, int namelen);
|
|
#endif
|
|
/**
|
|
* fdt_subnode_offset - find a subnode of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to locate
|
|
*
|
|
* fdt_subnode_offset() finds a subnode of the node at structure block
|
|
* offset parentoffset with the given name. name may include a unit
|
|
* address, in which case fdt_subnode_offset() will find the subnode
|
|
* with that unit address, or the unit address may be omitted, in
|
|
* which case fdt_subnode_offset() will find an arbitrary subnode
|
|
* whose name excluding unit address matches the given name.
|
|
*
|
|
* returns:
|
|
* structure block offset of the requested subnode (>=0), on success
|
|
* -FDT_ERR_NOTFOUND, if the requested subnode does not exist
|
|
* -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE
|
|
* tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_path_offset_namelen - find a tree node by its full path
|
|
* @fdt: pointer to the device tree blob
|
|
* @path: full path of the node to locate
|
|
* @namelen: number of characters of path to consider
|
|
*
|
|
* Identical to fdt_path_offset(), but only consider the first namelen
|
|
* characters of path as the path name.
|
|
*
|
|
* Return: offset of the node or negative libfdt error value otherwise
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_path_offset - find a tree node by its full path
|
|
* @fdt: pointer to the device tree blob
|
|
* @path: full path of the node to locate
|
|
*
|
|
* fdt_path_offset() finds a node of a given path in the device tree.
|
|
* Each path component may omit the unit address portion, but the
|
|
* results of this are undefined if any such path component is
|
|
* ambiguous (that is if there are multiple nodes at the relevant
|
|
* level matching the given component, differentiated only by unit
|
|
* address).
|
|
*
|
|
* returns:
|
|
* structure block offset of the node with the requested path (>=0), on
|
|
* success
|
|
* -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid
|
|
* -FDT_ERR_NOTFOUND, if the requested node does not exist
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_path_offset(const void *fdt, const char *path);
|
|
|
|
/**
|
|
* fdt_get_name - retrieve the name of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of the starting node
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_get_name() retrieves the name (including unit address) of the
|
|
* device tree node at structure block offset nodeoffset. If lenp is
|
|
* non-NULL, the length of this name is also returned, in the integer
|
|
* pointed to by lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the node's name, on success
|
|
* If lenp is non-NULL, *lenp contains the length of that name
|
|
* (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL *lenp contains an error code (<0):
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
|
|
* tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE, standard meanings
|
|
*/
|
|
const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
|
|
|
|
/**
|
|
* fdt_first_property_offset - find the offset of a node's first property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of a node
|
|
*
|
|
* fdt_first_property_offset() finds the first property of the node at
|
|
* the given structure block offset.
|
|
*
|
|
* returns:
|
|
* structure block offset of the property (>=0), on success
|
|
* -FDT_ERR_NOTFOUND, if the requested node has no properties
|
|
* -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_first_property_offset(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_next_property_offset - step through a node's properties
|
|
* @fdt: pointer to the device tree blob
|
|
* @offset: structure block offset of a property
|
|
*
|
|
* fdt_next_property_offset() finds the property immediately after the
|
|
* one at the given structure block offset. This will be a property
|
|
* of the same node as the given property.
|
|
*
|
|
* returns:
|
|
* structure block offset of the next property (>=0), on success
|
|
* -FDT_ERR_NOTFOUND, if the given property is the last in its node
|
|
* -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_next_property_offset(const void *fdt, int offset);
|
|
|
|
/**
|
|
* fdt_for_each_property_offset - iterate over all properties of a node
|
|
*
|
|
* @property: property offset (int, lvalue)
|
|
* @fdt: FDT blob (const void *)
|
|
* @node: node offset (int)
|
|
*
|
|
* This is actually a wrapper around a for loop and would be used like so:
|
|
*
|
|
* fdt_for_each_property_offset(property, fdt, node) {
|
|
* Use property
|
|
* ...
|
|
* }
|
|
*
|
|
* if ((property < 0) && (property != -FDT_ERR_NOTFOUND)) {
|
|
* Error handling
|
|
* }
|
|
*
|
|
* Note that this is implemented as a macro and property is used as
|
|
* iterator in the loop. The node variable can be constant or even a
|
|
* literal.
|
|
*/
|
|
#define fdt_for_each_property_offset(property, fdt, node) \
|
|
for (property = fdt_first_property_offset(fdt, node); \
|
|
property >= 0; \
|
|
property = fdt_next_property_offset(fdt, property))
|
|
|
|
/**
|
|
* fdt_get_property_by_offset - retrieve the property at a given offset
|
|
* @fdt: pointer to the device tree blob
|
|
* @offset: offset of the property to retrieve
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_get_property_by_offset() retrieves a pointer to the
|
|
* fdt_property structure within the device tree blob at the given
|
|
* offset. If lenp is non-NULL, the length of the property value is
|
|
* also returned, in the integer pointed to by lenp.
|
|
*
|
|
* Note that this code only works on device tree versions >= 16. fdt_getprop()
|
|
* works on all versions.
|
|
*
|
|
* returns:
|
|
* pointer to the structure representing the property
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
|
|
int offset,
|
|
int *lenp);
|
|
|
|
/**
|
|
* fdt_get_property_namelen - find a property based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @namelen: number of characters of name to consider
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* Identical to fdt_get_property(), but only examine the first namelen
|
|
* characters of name for matching the property name.
|
|
*
|
|
* Return: pointer to the structure representing the property, or NULL
|
|
* if not found
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
|
|
int nodeoffset,
|
|
const char *name,
|
|
int namelen, int *lenp);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_get_property - find a given property in a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_get_property() retrieves a pointer to the fdt_property
|
|
* structure within the device tree blob corresponding to the property
|
|
* named 'name' of the node at offset nodeoffset. If lenp is
|
|
* non-NULL, the length of the property value is also returned, in the
|
|
* integer pointed to by lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the structure representing the property
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_NOTFOUND, node does not have named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
|
|
* tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
|
|
const char *name, int *lenp);
|
|
static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
|
|
const char *name,
|
|
int *lenp)
|
|
{
|
|
return (struct fdt_property *)(uintptr_t)
|
|
fdt_get_property(fdt, nodeoffset, name, lenp);
|
|
}
|
|
|
|
/**
|
|
* fdt_getprop_by_offset - retrieve the value of a property at a given offset
|
|
* @fdt: pointer to the device tree blob
|
|
* @offset: offset of the property to read
|
|
* @namep: pointer to a string variable (will be overwritten) or NULL
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_getprop_by_offset() retrieves a pointer to the value of the
|
|
* property at structure block offset 'offset' (this will be a pointer
|
|
* to within the device blob itself, not a copy of the value). If
|
|
* lenp is non-NULL, the length of the property value is also
|
|
* returned, in the integer pointed to by lenp. If namep is non-NULL,
|
|
* the property's namne will also be returned in the char * pointed to
|
|
* by namep (this will be a pointer to within the device tree's string
|
|
* block, not a new copy of the name).
|
|
*
|
|
* returns:
|
|
* pointer to the property's value
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* if namep is non-NULL *namep contiains a pointer to the property
|
|
* name.
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#ifndef SWIG /* This function is not useful in Python */
|
|
const void *fdt_getprop_by_offset(const void *fdt, int offset,
|
|
const char **namep, int *lenp);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_getprop_namelen - get property value based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @namelen: number of characters of name to consider
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* Identical to fdt_getprop(), but only examine the first namelen
|
|
* characters of name for matching the property name.
|
|
*
|
|
* Return: pointer to the property's value or NULL on error
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
|
|
const char *name, int namelen, int *lenp);
|
|
static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset,
|
|
const char *name, int namelen,
|
|
int *lenp)
|
|
{
|
|
return (void *)(uintptr_t)fdt_getprop_namelen(fdt, nodeoffset, name,
|
|
namelen, lenp);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* fdt_getprop - retrieve the value of a given property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_getprop() retrieves a pointer to the value of the property
|
|
* named @name of the node at offset @nodeoffset (this will be a
|
|
* pointer to within the device blob itself, not a copy of the value).
|
|
* If @lenp is non-NULL, the length of the property value is also
|
|
* returned, in the integer pointed to by @lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the property's value
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_NOTFOUND, node does not have named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE
|
|
* tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const void *fdt_getprop(const void *fdt, int nodeoffset,
|
|
const char *name, int *lenp);
|
|
static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
|
|
const char *name, int *lenp)
|
|
{
|
|
return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);
|
|
}
|
|
|
|
/**
|
|
* fdt_get_phandle - retrieve the phandle of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of the node
|
|
*
|
|
* fdt_get_phandle() retrieves the phandle of the device tree node at
|
|
* structure block offset nodeoffset.
|
|
*
|
|
* returns:
|
|
* the phandle of the node at nodeoffset, on success (!= 0, != -1)
|
|
* 0, if the node has no phandle, or another error occurs
|
|
*/
|
|
uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_get_alias_namelen - get alias based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of the alias th look up
|
|
* @namelen: number of characters of name to consider
|
|
*
|
|
* Identical to fdt_get_alias(), but only examine the first @namelen
|
|
* characters of @name for matching the alias name.
|
|
*
|
|
* Return: a pointer to the expansion of the alias named @name, if it exists,
|
|
* NULL otherwise
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
const char *fdt_get_alias_namelen(const void *fdt,
|
|
const char *name, int namelen);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_get_alias - retrieve the path referenced by a given alias
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of the alias th look up
|
|
*
|
|
* fdt_get_alias() retrieves the value of a given alias. That is, the
|
|
* value of the property named @name in the node /aliases.
|
|
*
|
|
* returns:
|
|
* a pointer to the expansion of the alias named 'name', if it exists
|
|
* NULL, if the given alias or the /aliases node does not exist
|
|
*/
|
|
const char *fdt_get_alias(const void *fdt, const char *name);
|
|
|
|
/**
|
|
* fdt_get_path - determine the full path of a node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose path to find
|
|
* @buf: character buffer to contain the returned path (will be overwritten)
|
|
* @buflen: size of the character buffer at buf
|
|
*
|
|
* fdt_get_path() computes the full path of the node at offset
|
|
* nodeoffset, and records that path in the buffer at buf.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* buf contains the absolute path of the node at
|
|
* nodeoffset, as a NUL-terminated string.
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)
|
|
* characters and will not fit in the given buffer.
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
|
|
|
|
/**
|
|
* fdt_supernode_atdepth_offset - find a specific ancestor of a node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
* @supernodedepth: depth of the ancestor to find
|
|
* @nodedepth: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_supernode_atdepth_offset() finds an ancestor of the given node
|
|
* at a specific depth from the root (where the root itself has depth
|
|
* 0, its immediate subnodes depth 1 and so forth). So
|
|
* fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);
|
|
* will always return 0, the offset of the root node. If the node at
|
|
* nodeoffset has depth D, then:
|
|
* fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);
|
|
* will return nodeoffset itself.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
* structure block offset of the node at node offset's ancestor
|
|
* of depth supernodedepth (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of
|
|
* nodeoffset
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
|
|
int supernodedepth, int *nodedepth);
|
|
|
|
/**
|
|
* fdt_node_depth - find the depth of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
*
|
|
* fdt_node_depth() finds the depth of a given node. The root node
|
|
* has depth 0, its immediate subnodes depth 1 and so forth.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
* depth of the node at nodeoffset (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_depth(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_parent_offset - find the parent of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
*
|
|
* fdt_parent_offset() locates the parent node of a given node (that
|
|
* is, it finds the offset of the node which contains the node at
|
|
* nodeoffset as a subnode).
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset, *twice*.
|
|
*
|
|
* returns:
|
|
* structure block offset of the parent of the node at nodeoffset
|
|
* (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_parent_offset(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_node_offset_by_prop_value - find nodes with a given property value
|
|
* @fdt: pointer to the device tree blob
|
|
* @startoffset: only find nodes after this offset
|
|
* @propname: property name to check
|
|
* @propval: property value to search for
|
|
* @proplen: length of the value in propval
|
|
*
|
|
* fdt_node_offset_by_prop_value() returns the offset of the first
|
|
* node after startoffset, which has a property named propname whose
|
|
* value is of length proplen and has value equal to propval; or if
|
|
* startoffset is -1, the very first such node in the tree.
|
|
*
|
|
* To iterate through all nodes matching the criterion, the following
|
|
* idiom can be used:
|
|
* offset = fdt_node_offset_by_prop_value(fdt, -1, propname,
|
|
* propval, proplen);
|
|
* while (offset != -FDT_ERR_NOTFOUND) {
|
|
* // other code here
|
|
* offset = fdt_node_offset_by_prop_value(fdt, offset, propname,
|
|
* propval, proplen);
|
|
* }
|
|
*
|
|
* Note the -1 in the first call to the function, if 0 is used here
|
|
* instead, the function will never locate the root node, even if it
|
|
* matches the criterion.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0, >startoffset),
|
|
* on success
|
|
* -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
|
|
* tree after startoffset
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
|
|
const char *propname,
|
|
const void *propval, int proplen);
|
|
|
|
/**
|
|
* fdt_node_offset_by_phandle - find the node with a given phandle
|
|
* @fdt: pointer to the device tree blob
|
|
* @phandle: phandle value
|
|
*
|
|
* fdt_node_offset_by_phandle() returns the offset of the node
|
|
* which has the given phandle value. If there is more than one node
|
|
* in the tree with the given phandle (an invalid tree), results are
|
|
* undefined.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0), on success
|
|
* -FDT_ERR_NOTFOUND, no node with that phandle exists
|
|
* -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1)
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle);
|
|
|
|
/**
|
|
* fdt_node_check_compatible - check a node's compatible property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of a tree node
|
|
* @compatible: string to match against
|
|
*
|
|
* fdt_node_check_compatible() returns 0 if the given node contains a
|
|
* @compatible property with the given string as one of its elements,
|
|
* it returns non-zero otherwise, or on error.
|
|
*
|
|
* returns:
|
|
* 0, if the node has a 'compatible' property listing the given string
|
|
* 1, if the node has a 'compatible' property, but it does not list
|
|
* the given string
|
|
* -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property
|
|
* -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
|
|
const char *compatible);
|
|
|
|
/**
|
|
* fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
|
|
* @fdt: pointer to the device tree blob
|
|
* @startoffset: only find nodes after this offset
|
|
* @compatible: 'compatible' string to match against
|
|
*
|
|
* fdt_node_offset_by_compatible() returns the offset of the first
|
|
* node after startoffset, which has a 'compatible' property which
|
|
* lists the given compatible string; or if startoffset is -1, the
|
|
* very first such node in the tree.
|
|
*
|
|
* To iterate through all nodes matching the criterion, the following
|
|
* idiom can be used:
|
|
* offset = fdt_node_offset_by_compatible(fdt, -1, compatible);
|
|
* while (offset != -FDT_ERR_NOTFOUND) {
|
|
* // other code here
|
|
* offset = fdt_node_offset_by_compatible(fdt, offset, compatible);
|
|
* }
|
|
*
|
|
* Note the -1 in the first call to the function, if 0 is used here
|
|
* instead, the function will never locate the root node, even if it
|
|
* matches the criterion.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0, >startoffset),
|
|
* on success
|
|
* -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
|
|
* tree after startoffset
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
|
|
const char *compatible);
|
|
|
|
/**
|
|
* fdt_stringlist_contains - check a string list property for a string
|
|
* @strlist: Property containing a list of strings to check
|
|
* @listlen: Length of property
|
|
* @str: String to search for
|
|
*
|
|
* This is a utility function provided for convenience. The list contains
|
|
* one or more strings, each terminated by \0, as is found in a device tree
|
|
* "compatible" property.
|
|
*
|
|
* Return: 1 if the string is found in the list, 0 not found, or invalid list
|
|
*/
|
|
int fdt_stringlist_contains(const char *strlist, int listlen, const char *str);
|
|
|
|
/**
|
|
* fdt_stringlist_count - count the number of strings in a string list
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of a tree node
|
|
* @property: name of the property containing the string list
|
|
*
|
|
* Return:
|
|
* the number of strings in the given property
|
|
* -FDT_ERR_BADVALUE if the property value is not NUL-terminated
|
|
* -FDT_ERR_NOTFOUND if the property does not exist
|
|
*/
|
|
int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property);
|
|
|
|
/**
|
|
* fdt_stringlist_search - find a string in a string list and return its index
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of a tree node
|
|
* @property: name of the property containing the string list
|
|
* @string: string to look up in the string list
|
|
*
|
|
* Note that it is possible for this function to succeed on property values
|
|
* that are not NUL-terminated. That's because the function will stop after
|
|
* finding the first occurrence of @string. This can for example happen with
|
|
* small-valued cell properties, such as #address-cells, when searching for
|
|
* the empty string.
|
|
*
|
|
* return:
|
|
* the index of the string in the list of strings
|
|
* -FDT_ERR_BADVALUE if the property value is not NUL-terminated
|
|
* -FDT_ERR_NOTFOUND if the property does not exist or does not contain
|
|
* the given string
|
|
*/
|
|
int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
|
|
const char *string);
|
|
|
|
/**
|
|
* fdt_stringlist_get() - obtain the string at a given index in a string list
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of a tree node
|
|
* @property: name of the property containing the string list
|
|
* @index: index of the string to return
|
|
* @lenp: return location for the string length or an error code on failure
|
|
*
|
|
* Note that this will successfully extract strings from properties with
|
|
* non-NUL-terminated values. For example on small-valued cell properties
|
|
* this function will return the empty string.
|
|
*
|
|
* If non-NULL, the length of the string (on success) or a negative error-code
|
|
* (on failure) will be stored in the integer pointer to by lenp.
|
|
*
|
|
* Return:
|
|
* A pointer to the string at the given index in the string list or NULL on
|
|
* failure. On success the length of the string will be stored in the memory
|
|
* location pointed to by the lenp parameter, if non-NULL. On failure one of
|
|
* the following negative error codes will be returned in the lenp parameter
|
|
* (if non-NULL):
|
|
* -FDT_ERR_BADVALUE if the property value is not NUL-terminated
|
|
* -FDT_ERR_NOTFOUND if the property does not exist
|
|
*/
|
|
const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
|
|
const char *property, int index,
|
|
int *lenp);
|
|
|
|
/**********************************************************************/
|
|
/* Read-only functions (addressing related) */
|
|
/**********************************************************************/
|
|
|
|
/**
|
|
* FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells
|
|
*
|
|
* This is the maximum value for #address-cells, #size-cells and
|
|
* similar properties that will be processed by libfdt. IEE1275
|
|
* requires that OF implementations handle values up to 4.
|
|
* Implementations may support larger values, but in practice higher
|
|
* values aren't used.
|
|
*/
|
|
#define FDT_MAX_NCELLS 4
|
|
|
|
/**
|
|
* fdt_address_cells - retrieve address size for a bus represented in the tree
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to find the address size for
|
|
*
|
|
* When the node has a valid #address-cells property, returns its value.
|
|
*
|
|
* returns:
|
|
* 0 <= n < FDT_MAX_NCELLS, on success
|
|
* 2, if the node has no #address-cells property
|
|
* -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
|
|
* #address-cells property
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_address_cells(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_size_cells - retrieve address range size for a bus represented in the
|
|
* tree
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to find the address range size for
|
|
*
|
|
* When the node has a valid #size-cells property, returns its value.
|
|
*
|
|
* returns:
|
|
* 0 <= n < FDT_MAX_NCELLS, on success
|
|
* 1, if the node has no #size-cells property
|
|
* -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
|
|
* #size-cells property
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_size_cells(const void *fdt, int nodeoffset);
|
|
|
|
|
|
/**********************************************************************/
|
|
/* Write-in-place functions */
|
|
/**********************************************************************/
|
|
|
|
/**
|
|
* fdt_setprop_inplace_namelen_partial - change a property's value,
|
|
* but not its size
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @namelen: number of characters of name to consider
|
|
* @idx: index of the property to change in the array
|
|
* @val: pointer to data to replace the property value with
|
|
* @len: length of the property value
|
|
*
|
|
* Identical to fdt_setprop_inplace(), but modifies the given property
|
|
* starting from the given index, and using only the first characters
|
|
* of the name. It is useful when you want to manipulate only one value of
|
|
* an array and you have a string that doesn't end with \0.
|
|
*
|
|
* Return: 0 on success, negative libfdt error value otherwise
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
|
|
const char *name, int namelen,
|
|
uint32_t idx, const void *val,
|
|
int len);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_setprop_inplace - change a property's value, but not its size
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: pointer to data to replace the property value with
|
|
* @len: length of the property value
|
|
*
|
|
* fdt_setprop_inplace() replaces the value of a given property with
|
|
* the data in val, of length len. This function cannot change the
|
|
* size of a property, and so will only work if len is equal to the
|
|
* current length of the property.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if len is not equal to the property's current length
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value to replace the property with
|
|
*
|
|
* fdt_setprop_inplace_u32() replaces the value of a given property
|
|
* with the 32-bit integer value in val, converting val to big-endian
|
|
* if necessary. This function cannot change the size of a property,
|
|
* and so will only work if the property already exists and has length
|
|
* 4.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if the property's length is not equal to 4
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_inplace_u64 - change the value of a 64-bit integer property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value to replace the property with
|
|
*
|
|
* fdt_setprop_inplace_u64() replaces the value of a given property
|
|
* with the 64-bit integer value in val, converting val to big-endian
|
|
* if necessary. This function cannot change the size of a property,
|
|
* and so will only work if the property already exists and has length
|
|
* 8.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if the property's length is not equal to 8
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset,
|
|
const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_inplace_cell - change the value of a single-cell property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node containing the property
|
|
* @name: name of the property to change the value of
|
|
* @val: new value of the 32-bit cell
|
|
*
|
|
* This is an alternative name for fdt_setprop_inplace_u32()
|
|
* Return: 0 on success, negative libfdt error number otherwise.
|
|
*/
|
|
static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_nop_property - replace a property with nop tags
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to nop
|
|
* @name: name of the property to nop
|
|
*
|
|
* fdt_nop_property() will replace a given property's representation
|
|
* in the blob with FDT_NOP tags, effectively removing it from the
|
|
* tree.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the property, and will not alter or move any other part of the
|
|
* tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_nop_property(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_nop_node - replace a node (subtree) with nop tags
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to nop
|
|
*
|
|
* fdt_nop_node() will replace a given node's representation in the
|
|
* blob, including all its subnodes, if any, with FDT_NOP tags,
|
|
* effectively removing it from the tree.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the node and its properties and subnodes, and will not alter or
|
|
* move any other part of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_nop_node(void *fdt, int nodeoffset);
|
|
|
|
/**********************************************************************/
|
|
/* Sequential write functions */
|
|
/**********************************************************************/
|
|
|
|
/* fdt_create_with_flags flags */
|
|
#define FDT_CREATE_FLAG_NO_NAME_DEDUP 0x1
|
|
/* FDT_CREATE_FLAG_NO_NAME_DEDUP: Do not try to de-duplicate property
|
|
* names in the fdt. This can result in faster creation times, but
|
|
* a larger fdt. */
|
|
|
|
#define FDT_CREATE_FLAGS_ALL (FDT_CREATE_FLAG_NO_NAME_DEDUP)
|
|
|
|
/**
|
|
* fdt_create_with_flags - begin creation of a new fdt
|
|
* @buf: pointer to memory allocated where fdt will be created
|
|
* @bufsize: size of the memory space at fdt
|
|
* @flags: a valid combination of FDT_CREATE_FLAG_ flags, or 0.
|
|
*
|
|
* fdt_create_with_flags() begins the process of creating a new fdt with
|
|
* the sequential write interface.
|
|
*
|
|
* fdt creation process must end with fdt_finished() to produce a valid fdt.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, bufsize is insufficient for a minimal fdt
|
|
* -FDT_ERR_BADFLAGS, flags is not valid
|
|
*/
|
|
int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags);
|
|
|
|
/**
|
|
* fdt_create - begin creation of a new fdt
|
|
* @buf: pointer to memory allocated where fdt will be created
|
|
* @bufsize: size of the memory space at fdt
|
|
*
|
|
* fdt_create() is equivalent to fdt_create_with_flags() with flags=0.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, bufsize is insufficient for a minimal fdt
|
|
*/
|
|
int fdt_create(void *buf, int bufsize);
|
|
|
|
int fdt_resize(void *fdt, void *buf, int bufsize);
|
|
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
|
|
int fdt_finish_reservemap(void *fdt);
|
|
int fdt_begin_node(void *fdt, const char *name);
|
|
int fdt_property(void *fdt, const char *name, const void *val, int len);
|
|
static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_property(fdt, name, &tmp, sizeof(tmp));
|
|
}
|
|
static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_property(fdt, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
#ifndef SWIG /* Not available in Python */
|
|
static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
|
|
{
|
|
return fdt_property_u32(fdt, name, val);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* fdt_property_placeholder - add a new property and return a ptr to its value
|
|
*
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of property to add
|
|
* @len: length of property value in bytes
|
|
* @valp: returns a pointer to where where the value should be placed
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_NOSPACE, standard meanings
|
|
*/
|
|
int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp);
|
|
|
|
#define fdt_property_string(fdt, name, str) \
|
|
fdt_property(fdt, name, str, strlen(str)+1)
|
|
int fdt_end_node(void *fdt);
|
|
int fdt_finish(void *fdt);
|
|
|
|
/**********************************************************************/
|
|
/* Read-write functions */
|
|
/**********************************************************************/
|
|
|
|
int fdt_create_empty_tree(void *buf, int bufsize);
|
|
int fdt_open_into(const void *fdt, void *buf, int bufsize);
|
|
int fdt_pack(void *fdt);
|
|
|
|
/**
|
|
* fdt_add_mem_rsv - add one memory reserve map entry
|
|
* @fdt: pointer to the device tree blob
|
|
* @address: 64-bit start address of the reserve map entry
|
|
* @size: 64-bit size of the reserved region
|
|
*
|
|
* Adds a reserve map entry to the given blob reserving a region at
|
|
* address address of length size.
|
|
*
|
|
* This function will insert data into the reserve map and will
|
|
* therefore change the indexes of some entries in the table.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new reservation entry
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
|
|
|
|
/**
|
|
* fdt_del_mem_rsv - remove a memory reserve map entry
|
|
* @fdt: pointer to the device tree blob
|
|
* @n: entry to remove
|
|
*
|
|
* fdt_del_mem_rsv() removes the n-th memory reserve map entry from
|
|
* the blob.
|
|
*
|
|
* This function will delete data from the reservation table and will
|
|
* therefore change the indexes of some entries in the table.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
|
|
* are less than n+1 reserve map entries)
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_del_mem_rsv(void *fdt, int n);
|
|
|
|
/**
|
|
* fdt_set_name - change the name of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of a node
|
|
* @name: name to give the node
|
|
*
|
|
* fdt_set_name() replaces the name (including unit address, if any)
|
|
* of the given node with the given string. NOTE: this function can't
|
|
* efficiently check if the new name is unique amongst the given
|
|
* node's siblings; results are undefined if this function is invoked
|
|
* with a name equal to one of the given node's siblings.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob
|
|
* to contain the new name
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE, standard meanings
|
|
*/
|
|
int fdt_set_name(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_setprop - create or change a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: pointer to data to set the property value to
|
|
* @len: length of the property value
|
|
*
|
|
* fdt_setprop() sets the value of the named property in the given
|
|
* node to the given value and length, creating the property if it
|
|
* does not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
|
|
/**
|
|
* fdt_setprop_placeholder - allocate space for a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @len: length of the property value
|
|
* @prop_data: return pointer to property data
|
|
*
|
|
* fdt_setprop_placeholer() allocates the named property in the given node.
|
|
* If the property exists it is resized. In either case a pointer to the
|
|
* property data is returned.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
|
|
int len, void **prop_data);
|
|
|
|
/**
|
|
* fdt_setprop_u32 - set a property to a 32-bit integer
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value for the property (native endian)
|
|
*
|
|
* fdt_setprop_u32() sets the value of the named property in the given
|
|
* node to the given 32-bit integer value (converting to big-endian if
|
|
* necessary), or creates a new property with that value if it does
|
|
* not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name,
|
|
uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_u64 - set a property to a 64-bit integer
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value for the property (native endian)
|
|
*
|
|
* fdt_setprop_u64() sets the value of the named property in the given
|
|
* node to the given 64-bit integer value (converting to big-endian if
|
|
* necessary), or creates a new property with that value if it does
|
|
* not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name,
|
|
uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_cell - set a property to a single cell value
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value for the property (native endian)
|
|
*
|
|
* This is an alternative name for fdt_setprop_u32()
|
|
*
|
|
* Return: 0 on success, negative libfdt error value otherwise.
|
|
*/
|
|
static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
|
|
uint32_t val)
|
|
{
|
|
return fdt_setprop_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_string - set a property to a string value
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @str: string value for the property
|
|
*
|
|
* fdt_setprop_string() sets the value of the named property in the
|
|
* given node to the given string value (using the length of the
|
|
* string to determine the new length of the property), or creates a
|
|
* new property with that value if it does not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
|
|
fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
|
|
|
|
|
|
/**
|
|
* fdt_setprop_empty - set a property to an empty value
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
*
|
|
* fdt_setprop_empty() sets the value of the named property in the
|
|
* given node to an empty (zero length) value, or creates a new empty
|
|
* property if it does not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#define fdt_setprop_empty(fdt, nodeoffset, name) \
|
|
fdt_setprop((fdt), (nodeoffset), (name), NULL, 0)
|
|
|
|
/**
|
|
* fdt_appendprop - append to or create a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to append to
|
|
* @val: pointer to data to append to the property value
|
|
* @len: length of the data to append to the property value
|
|
*
|
|
* fdt_appendprop() appends the value to the named property in the
|
|
* given node, creating the property if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
|
|
/**
|
|
* fdt_appendprop_u32 - append a 32-bit integer value to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value to append to the property (native endian)
|
|
*
|
|
* fdt_appendprop_u32() appends the given 32-bit integer value
|
|
* (converting to big-endian if necessary) to the value of the named
|
|
* property in the given node, or creates a new property with that
|
|
* value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_appendprop_u32(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_u64 - append a 64-bit integer value to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value to append to the property (native endian)
|
|
*
|
|
* fdt_appendprop_u64() appends the given 64-bit integer value
|
|
* (converting to big-endian if necessary) to the value of the named
|
|
* property in the given node, or creates a new property with that
|
|
* value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_appendprop_u64(void *fdt, int nodeoffset,
|
|
const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_cell - append a single cell value to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value to append to the property (native endian)
|
|
*
|
|
* This is an alternative name for fdt_appendprop_u32()
|
|
*
|
|
* Return: 0 on success, negative libfdt error value otherwise.
|
|
*/
|
|
static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
return fdt_appendprop_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_string - append a string to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @str: string value to append to the property
|
|
*
|
|
* fdt_appendprop_string() appends the given string to the value of
|
|
* the named property in the given node, or creates a new property
|
|
* with that value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#define fdt_appendprop_string(fdt, nodeoffset, name, str) \
|
|
fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
|
|
|
|
/**
|
|
* fdt_appendprop_addrrange - append a address range property
|
|
* @fdt: pointer to the device tree blob
|
|
* @parent: offset of the parent node
|
|
* @nodeoffset: offset of the node to add a property at
|
|
* @name: name of property
|
|
* @addr: start address of a given range
|
|
* @size: size of a given range
|
|
*
|
|
* fdt_appendprop_addrrange() appends an address range value (start
|
|
* address and size) to the value of the named property in the given
|
|
* node, or creates a new property with that value if it does not
|
|
* already exist.
|
|
* If "name" is not specified, a default "reg" is used.
|
|
* Cell sizes are determined by parent's #address-cells and #size-cells.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
|
|
* #address-cells property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADVALUE, addr or size doesn't fit to respective cells size
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain a new property
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
|
|
const char *name, uint64_t addr, uint64_t size);
|
|
|
|
/**
|
|
* fdt_delprop - delete a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to nop
|
|
* @name: name of the property to nop
|
|
*
|
|
* fdt_del_property() will delete the given property.
|
|
*
|
|
* This function will delete data from the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_delprop(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_add_subnode_namelen - creates a new node based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to create
|
|
* @namelen: number of characters of name to consider
|
|
*
|
|
* Identical to fdt_add_subnode(), but use only the first @namelen
|
|
* characters of @name as the name of the new node. This is useful for
|
|
* creating subnodes based on a portion of a larger string, such as a
|
|
* full path.
|
|
*
|
|
* Return: structure block offset of the created subnode (>=0),
|
|
* negative libfdt error value otherwise
|
|
*/
|
|
#ifndef SWIG /* Not available in Python */
|
|
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
|
|
const char *name, int namelen);
|
|
#endif
|
|
|
|
/**
|
|
* fdt_add_subnode - creates a new node
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to locate
|
|
*
|
|
* fdt_add_subnode() creates a new node as a subnode of the node at
|
|
* structure block offset parentoffset, with the given name (which
|
|
* should include the unit address, if any).
|
|
*
|
|
* This function will insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* structure block offset of the created nodeequested subnode (>=0), on
|
|
* success
|
|
* -FDT_ERR_NOTFOUND, if the requested subnode does not exist
|
|
* -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE
|
|
* tag
|
|
* -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
|
|
* the given name
|
|
* -FDT_ERR_NOSPACE, if there is insufficient free space in the
|
|
* blob to contain the new node
|
|
* -FDT_ERR_NOSPACE
|
|
* -FDT_ERR_BADLAYOUT
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_add_subnode(void *fdt, int parentoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_del_node - delete a node (subtree)
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to nop
|
|
*
|
|
* fdt_del_node() will remove the given node, including all its
|
|
* subnodes if any, from the blob.
|
|
*
|
|
* This function will delete data from the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_del_node(void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_overlay_apply - Applies a DT overlay on a base DT
|
|
* @fdt: pointer to the base device tree blob
|
|
* @fdto: pointer to the device tree overlay blob
|
|
*
|
|
* fdt_overlay_apply() will apply the given device tree overlay on the
|
|
* given base device tree.
|
|
*
|
|
* Expect the base device tree to be modified, even if the function
|
|
* returns an error.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there's not enough space in the base device tree
|
|
* -FDT_ERR_NOTFOUND, the overlay points to some inexistant nodes or
|
|
* properties in the base DT
|
|
* -FDT_ERR_BADPHANDLE,
|
|
* -FDT_ERR_BADOVERLAY,
|
|
* -FDT_ERR_NOPHANDLES,
|
|
* -FDT_ERR_INTERNAL,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADOFFSET,
|
|
* -FDT_ERR_BADPATH,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_overlay_apply(void *fdt, void *fdto);
|
|
|
|
/**
|
|
* fdt_overlay_target_offset - retrieves the offset of a fragment's target
|
|
* @fdt: Base device tree blob
|
|
* @fdto: Device tree overlay blob
|
|
* @fragment_offset: node offset of the fragment in the overlay
|
|
* @pathp: pointer which receives the path of the target (or NULL)
|
|
*
|
|
* fdt_overlay_target_offset() retrieves the target offset in the base
|
|
* device tree of a fragment, no matter how the actual targeting is
|
|
* done (through a phandle or a path)
|
|
*
|
|
* returns:
|
|
* the targeted node offset in the base device tree
|
|
* Negative error code on error
|
|
*/
|
|
int fdt_overlay_target_offset(const void *fdt, const void *fdto,
|
|
int fragment_offset, char const **pathp);
|
|
|
|
/**********************************************************************/
|
|
/* Debugging / informational functions */
|
|
/**********************************************************************/
|
|
|
|
const char *fdt_strerror(int errval);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LIBFDT_H */
|