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dtc/libfdt/libfdt.h

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/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
#ifndef LIBFDT_H
#define LIBFDT_H
/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2006 David Gibson, IBM Corporation.
*/
#include <libfdt_env.h>
#include <fdt.h>
#define FDT_FIRST_SUPPORTED_VERSION 0x02
#define FDT_LAST_SUPPORTED_VERSION 0x11
/* Error codes: informative error codes */
#define FDT_ERR_NOTFOUND 1
/* FDT_ERR_NOTFOUND: The requested node or property does not exist */
#define FDT_ERR_EXISTS 2
/* FDT_ERR_EXISTS: Attempted to create a node or property which
* already exists */
#define FDT_ERR_NOSPACE 3
/* FDT_ERR_NOSPACE: Operation needed to expand the device
* tree, but its buffer did not have sufficient space to
* contain the expanded tree. Use fdt_open_into() to move the
* device tree to a buffer with more space. */
/* Error codes: codes for bad parameters */
#define FDT_ERR_BADOFFSET 4
/* FDT_ERR_BADOFFSET: Function was passed a structure block
* offset which is out-of-bounds, or which points to an
* unsuitable part of the structure for the operation. */
#define FDT_ERR_BADPATH 5
/* FDT_ERR_BADPATH: Function was passed a badly formatted path
* (e.g. missing a leading / for a function which requires an
* absolute path) */
#define FDT_ERR_BADPHANDLE 6
/* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle.
* This can be caused either by an invalid phandle property
* length, or the phandle value was either 0 or -1, which are
* not permitted. */
#define FDT_ERR_BADSTATE 7
/* FDT_ERR_BADSTATE: Function was passed an incomplete device
* tree created by the sequential-write functions, which is
* not sufficiently complete for the requested operation. */
/* Error codes: codes for bad device tree blobs */
#define FDT_ERR_TRUNCATED 8
/* FDT_ERR_TRUNCATED: FDT or a sub-block is improperly
* terminated (overflows, goes outside allowed bounds, or
* isn't properly terminated). */
#define FDT_ERR_BADMAGIC 9
/* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
* device tree at all - it is missing the flattened device
* tree magic number. */
#define FDT_ERR_BADVERSION 10
/* FDT_ERR_BADVERSION: Given device tree has a version which
* can't be handled by the requested operation. For
* read-write functions, this may mean that fdt_open_into() is
* required to convert the tree to the expected version. */
#define FDT_ERR_BADSTRUCTURE 11
/* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
* structure block or other serious error (e.g. misnested
* nodes, or subnodes preceding properties). */
#define FDT_ERR_BADLAYOUT 12
/* FDT_ERR_BADLAYOUT: For read-write functions, the given
* device tree has it's sub-blocks in an order that the
* function can't handle (memory reserve map, then structure,
* then strings). Use fdt_open_into() to reorganize the tree
* into a form suitable for the read-write operations. */
/* "Can't happen" error indicating a bug in libfdt */
#define FDT_ERR_INTERNAL 13
/* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
* Should never be returned, if it is, it indicates a bug in
* libfdt itself. */
/* Errors in device tree content */
#define FDT_ERR_BADNCELLS 14
/* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells
* or similar property with a bad format or value */
#define FDT_ERR_BADVALUE 15
/* FDT_ERR_BADVALUE: Device tree has a property with an unexpected
* value. For example: a property expected to contain a string list
* is not NUL-terminated within the length of its value. */
#define FDT_ERR_BADOVERLAY 16
/* FDT_ERR_BADOVERLAY: The device tree overlay, while
* correctly structured, cannot be applied due to some
* unexpected or missing value, property or node. */
#define FDT_ERR_NOPHANDLES 17
/* FDT_ERR_NOPHANDLES: The device tree doesn't have any
* phandle available anymore without causing an overflow */
#define FDT_ERR_BADFLAGS 18
/* FDT_ERR_BADFLAGS: The function was passed a flags field that
* contains invalid flags or an invalid combination of flags. */
#define FDT_ERR_MAX 18
/* constants */
#define FDT_MAX_PHANDLE 0xfffffffe
/* Valid values for phandles range from 1 to 2^32-2. */
/**********************************************************************/
/* Low-level functions (you probably don't need these) */
/**********************************************************************/
#ifndef SWIG /* This function is not useful in Python */
const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
#endif
static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
{
return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
}
uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
/*
* Alignment helpers:
* These helpers access words from a device tree blob. They're
* built to work even with unaligned pointers on platforms (ike
* ARM) that don't like unaligned loads and stores
*/
static inline uint32_t fdt32_ld(const fdt32_t *p)
{
const uint8_t *bp = (const uint8_t *)p;
return ((uint32_t)bp[0] << 24)
| ((uint32_t)bp[1] << 16)
| ((uint32_t)bp[2] << 8)
| bp[3];
}
static inline void fdt32_st(void *property, uint32_t value)
{
uint8_t *bp = (uint8_t *)property;
bp[0] = value >> 24;
bp[1] = (value >> 16) & 0xff;
bp[2] = (value >> 8) & 0xff;
bp[3] = value & 0xff;
}
static inline uint64_t fdt64_ld(const fdt64_t *p)
{
const uint8_t *bp = (const uint8_t *)p;
return ((uint64_t)bp[0] << 56)
| ((uint64_t)bp[1] << 48)
| ((uint64_t)bp[2] << 40)
| ((uint64_t)bp[3] << 32)
| ((uint64_t)bp[4] << 24)
| ((uint64_t)bp[5] << 16)
| ((uint64_t)bp[6] << 8)
| bp[7];
}
static inline void fdt64_st(void *property, uint64_t value)
{
uint8_t *bp = (uint8_t *)property;
bp[0] = value >> 56;
bp[1] = (value >> 48) & 0xff;
bp[2] = (value >> 40) & 0xff;
bp[3] = (value >> 32) & 0xff;
bp[4] = (value >> 24) & 0xff;
bp[5] = (value >> 16) & 0xff;
bp[6] = (value >> 8) & 0xff;
bp[7] = value & 0xff;
}
/**********************************************************************/
/* Traversal functions */
/**********************************************************************/
int fdt_next_node(const void *fdt, int offset, int *depth);
/**
* fdt_first_subnode() - get offset of first direct subnode
*
* @fdt: FDT blob
* @offset: Offset of node to check
* @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none
*/
int fdt_first_subnode(const void *fdt, int offset);
/**
* fdt_next_subnode() - get offset of next direct subnode
*
* After first calling fdt_first_subnode(), call this function repeatedly to
* get direct subnodes of a parent node.
*
* @fdt: FDT blob
* @offset: Offset of previous subnode
* @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more
* subnodes
*/
int fdt_next_subnode(const void *fdt, int offset);
/**
* fdt_for_each_subnode - iterate over all subnodes of a parent
*
* @node: child node (int, lvalue)
* @fdt: FDT blob (const void *)
* @parent: parent node (int)
*
* This is actually a wrapper around a for loop and would be used like so:
*
* fdt_for_each_subnode(node, fdt, parent) {
* Use node
* ...
* }
*
* if ((node < 0) && (node != -FDT_ERR_NOTFOUND)) {
* Error handling
* }
*
* Note that this is implemented as a macro and @node is used as
* iterator in the loop. The parent variable be constant or even a
* literal.
*
*/
#define fdt_for_each_subnode(node, fdt, parent) \
for (node = fdt_first_subnode(fdt, parent); \
node >= 0; \
node = fdt_next_subnode(fdt, node))
/**********************************************************************/
/* General functions */
/**********************************************************************/
#define fdt_get_header(fdt, field) \
(fdt32_ld(&((const struct fdt_header *)(fdt))->field))
#define fdt_magic(fdt) (fdt_get_header(fdt, magic))
#define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize))
#define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct))
#define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings))
#define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap))
#define fdt_version(fdt) (fdt_get_header(fdt, version))
#define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
#define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
#define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
#define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
#define fdt_set_hdr_(name) \
static inline void fdt_set_##name(void *fdt, uint32_t val) \
{ \
struct fdt_header *fdth = (struct fdt_header *)fdt; \
fdth->name = cpu_to_fdt32(val); \
}
fdt_set_hdr_(magic);
fdt_set_hdr_(totalsize);
fdt_set_hdr_(off_dt_struct);
fdt_set_hdr_(off_dt_strings);
fdt_set_hdr_(off_mem_rsvmap);
fdt_set_hdr_(version);
fdt_set_hdr_(last_comp_version);
fdt_set_hdr_(boot_cpuid_phys);
fdt_set_hdr_(size_dt_strings);
fdt_set_hdr_(size_dt_struct);
#undef fdt_set_hdr_
/**
* fdt_header_size - return the size of the tree's header
* @fdt: pointer to a flattened device tree
*/
size_t fdt_header_size(const void *fdt);
/**
* fdt_header_size_ - internal function which takes a version number
*/
size_t fdt_header_size_(uint32_t version);
/**
* fdt_check_header - sanity check a device tree header
* @fdt: pointer to data which might be a flattened device tree
*
* fdt_check_header() checks that the given buffer contains what
* appears to be a flattened device tree, and that the header contains
* valid information (to the extent that can be determined from the
* header alone).
*
* returns:
* 0, if the buffer appears to contain a valid device tree
* -FDT_ERR_BADMAGIC,
* -FDT_ERR_BADVERSION,
* -FDT_ERR_BADSTATE,
* -FDT_ERR_TRUNCATED, standard meanings, as above
*/
int fdt_check_header(const void *fdt);
/**
* fdt_move - move a device tree around in memory
* @fdt: pointer to the device tree to move
* @buf: pointer to memory where the device is to be moved
* @bufsize: size of the memory space at buf
*
* fdt_move() relocates, if possible, the device tree blob located at
* fdt to the buffer at buf of size bufsize. The buffer may overlap
* with the existing device tree blob at fdt. Therefore,
* fdt_move(fdt, fdt, fdt_totalsize(fdt))
* should always succeed.
*
* returns:
* 0, on success
* -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
* -FDT_ERR_BADMAGIC,
* -FDT_ERR_BADVERSION,
* -FDT_ERR_BADSTATE, standard meanings
*/
int fdt_move(const void *fdt, void *buf, int bufsize);
/**********************************************************************/
/* Read-only functions */
/**********************************************************************/
int fdt_check_full(const void *fdt, size_t bufsize);
/**
* fdt_get_string - retrieve a string from the strings block of a device tree
* @fdt: pointer to the device tree blob
* @stroffset: offset of the string within the strings block (native endian)
* @lenp: optional pointer to return the string's length
*
* fdt_get_string() retrieves a pointer to a single string from the
* strings block of the device tree blob at fdt, and optionally also
* returns the string's length in *lenp.
*
* returns:
* a pointer to the string, on success
* NULL, if stroffset is out of bounds, or doesn't point to a valid string
*/
const char *fdt_get_string(const void *fdt, int stroffset, int *lenp);
/**
* fdt_string - retrieve a string from the strings block of a device tree
* @fdt: pointer to the device tree blob
* @stroffset: offset of the string within the strings block (native endian)
*
* fdt_string() retrieves a pointer to a single string from the
* strings block of the device tree blob at fdt.
*
* returns:
* a pointer to the string, on success
* NULL, if stroffset is out of bounds, or doesn't point to a valid string
*/
const char *fdt_string(const void *fdt, int stroffset);
/**
* fdt_find_max_phandle - find and return the highest phandle in a tree
* @fdt: pointer to the device tree blob
* @phandle: return location for the highest phandle value found in the tree
*
* fdt_find_max_phandle() finds the highest phandle value in the given device
* tree. The value returned in @phandle is only valid if the function returns
* success.
*
* returns:
* 0 on success or a negative error code on failure
*/
int fdt_find_max_phandle(const void *fdt, uint32_t *phandle);
/**
* fdt_get_max_phandle - retrieves the highest phandle in a tree
* @fdt: pointer to the device tree blob
*
* fdt_get_max_phandle retrieves the highest phandle in the given
* device tree. This will ignore badly formatted phandles, or phandles
* with a value of 0 or -1.
*
* This function is deprecated in favour of fdt_find_max_phandle().
*
* returns:
* the highest phandle on success
* 0, if no phandle was found in the device tree
* -1, if an error occurred
*/
static inline uint32_t fdt_get_max_phandle(const void *fdt)
{
uint32_t phandle;
int err;
err = fdt_find_max_phandle(fdt, &phandle);
if (err < 0)
return (uint32_t)-1;
return phandle;
}
/**
* fdt_generate_phandle - return a new, unused phandle for a device tree blob
* @fdt: pointer to the device tree blob
* @phandle: return location for the new phandle
*
* Walks the device tree blob and looks for the highest phandle value. On
* success, the new, unused phandle value (one higher than the previously
* highest phandle value in the device tree blob) will be returned in the
* @phandle parameter.
*
* Returns:
* 0 on success or a negative error-code on failure
*/
int fdt_generate_phandle(const void *fdt, uint32_t *phandle);
/**
* fdt_num_mem_rsv - retrieve the number of memory reserve map entries
* @fdt: pointer to the device tree blob
*
* Returns the number of entries in the device tree blob's memory
* reservation map. This does not include the terminating 0,0 entry
* or any other (0,0) entries reserved for expansion.
*
* returns:
* the number of entries
*/
int fdt_num_mem_rsv(const void *fdt);
/**
* fdt_get_mem_rsv - retrieve one memory reserve map entry
* @fdt: pointer to the device tree blob
* @address, @size: pointers to 64-bit variables
*
* On success, *address and *size will contain the address and size of
* the n-th reserve map entry from the device tree blob, in
* native-endian format.
*
* returns:
* 0, on success
* -FDT_ERR_BADMAGIC,
* -FDT_ERR_BADVERSION,
* -FDT_ERR_BADSTATE, standard meanings
*/
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.
*/
#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.
*/
#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_offset: 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.
*/
#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.
*/
#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.
*/
#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.
*/
#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
*
* This is an alternative name for fdt_setprop_inplace_u32()
*/
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
* @fdt: 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
* @fdt: 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, @size: 64-bit values (native endian)
*
* 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
*
* This is an alternative name for fdt_setprop_u32()
*/
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
*
* This is an alternative name for fdt_appendprop_u32()
*/
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 locate
* @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.
*/
#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);
/**********************************************************************/
/* Debugging / informational functions */
/**********************************************************************/
const char *fdt_strerror(int errval);
#endif /* LIBFDT_H */