#ifndef _LIBFDT_H
  #define _LIBFDT_H

  /*
   * libfdt - Flat Device Tree manipulation
   * Copyright (C) 2006 David Gibson, IBM Corporation.
   *

   * libfdt is dual licensed: you can use it either under the terms of
   * the GPL, or the BSD license, at your option.
   *
   *  a) This library is free software; you can redistribute it and/or
   *     modify it under the terms of the GNU General Public License as
   *     published by the Free Software Foundation; either version 2 of the
   *     License, or (at your option) any later version.
   *
   *     This library is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *     GNU General Public License for more details.
   *
   *     You should have received a copy of the GNU General Public
   *     License along with this library; if not, write to the Free
   *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   *     MA 02110-1301 USA
   *
   * Alternatively,
   *
   *  b) Redistribution and use in source and binary forms, with or
   *     without modification, are permitted provided that the following
   *     conditions are met:

   *

   *     1. Redistributions of source code must retain the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer.
   *     2. Redistributions in binary form must reproduce the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer in the documentation and/or other materials
   *        provided with the distribution.

   *

   *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   */

  #include <libfdt_env.h>

  #include <fdt.h>

  
  #define FDT_FIRST_SUPPORTED_VERSION	0x10
  #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: Attemped 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
  	 * value.  phandle values of 0 and -1 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: Structure block of the given device tree
  	 * ends without an FDT_END tag. */
  #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. */

  #define FDT_ERR_MAX		13
  
  /**********************************************************************/
  /* Low-level functions (you probably don't need these)                */
  /**********************************************************************/

  const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);

  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);
  
  /**********************************************************************/

  /* 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);

  /**********************************************************************/

  /* General functions                                                  */
  /**********************************************************************/

  
  #define fdt_get_header(fdt, field) \

  	(fdt32_to_cpu(((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_check_header - sanity check a device tree or possible device tree
   * @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 with sane information in its
   * header.
   *
   * returns:
   *     0, if the buffer appears to contain a valid device tree
   *     -FDT_ERR_BADMAGIC,
   *     -FDT_ERR_BADVERSION,
   *     -FDT_ERR_BADSTATE, 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                                                */
  /**********************************************************************/

  /**

   * 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
   */
  const char *fdt_string(const void *fdt, int stroffset);

  /**

   * 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.
   */

  int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
  			       const char *name, int namelen);

  /**
   * 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 - 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_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.
   *
   * 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_namelen(), but only examine the first
   * namelen characters of name for matching the property name.
   */
  const struct fdt_property *fdt_get_property_namelen(const void *fdt,
  						    int nodeoffset,
  						    const char *name,
  						    int namelen, int *lenp);
  
  /**

   * 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
   * @ffset: 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
   */
  const void *fdt_getprop_by_offset(const void *fdt, int offset,
  				  const char **namep, int *lenp);
  
  /**

   * 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.
   */
  const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
  				const char *name, int namelen, int *lenp);
  
  /**

   * 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.
   */
  const char *fdt_get_alias_namelen(const void *fdt,
  				  const char *name, int namelen);
  
  /**

   * fdt_get_alias - retrieve the path referenced by a given alias

   * @fdt: pointer to the device tree blob

   * @name: name of the alias to 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);

  /**********************************************************************/
  /* Write-in-place functions                                           */
  /**********************************************************************/

  /**
   * 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
   */

  int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  			const void *val, int len);

  
  /**

   * 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                                         */
  /**********************************************************************/

  int fdt_create(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));

  }
  static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
  {
  	return fdt_property_u32(fdt, name, val);
  }

  #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_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_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_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.
   */

  int fdt_add_subnode_namelen(void *fdt, int parentoffset,
  			    const char *name, int namelen);

  
  /**
   * 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);

  /**********************************************************************/
  /* Debugging / informational functions                                */
  /**********************************************************************/

  const char *fdt_strerror(int errval);

  struct fdt_region {
  	int offset;
  	int size;
  };
  
  /**
   * fdt_find_regions() - find regions in device tree
   *
   * Given a list of nodes to include and properties to exclude, find
   * the regions of the device tree which describe those included parts.
   *
   * The intent is to get a list of regions which will be invariant provided
   * those parts are invariant. For example, if you request a list of regions
   * for all nodes but exclude the property "data", then you will get the
   * same region contents regardless of any change to "data" properties.
   *
   * This function can be used to produce a byte-stream to send to a hashing
   * function to verify that critical parts of the FDT have not changed.
   *
   * Nodes which are given in 'inc' are included in the region list, as
   * are the names of the immediate subnodes nodes (but not the properties
   * or subnodes of those subnodes).
   *
   * For eaxample "/" means to include the root node, all root properties
   * and the FDT_BEGIN_NODE and FDT_END_NODE of all subnodes of /. The latter
   * ensures that we capture the names of the subnodes. In a hashing situation
   * it prevents the root node from changing at all Any change to non-excluded
   * properties, names of subnodes or number of subnodes would be detected.
   *
   * When used with FITs this provides the ability to hash and sign parts of
   * the FIT based on different configurations in the FIT. Then it is
   * impossible to change anything about that configuration (include images
   * attached to the configuration), but it may be possible to add new
   * configurations, new images or new signatures within the existing
   * framework.
   *
   * Adding new properties to a device tree may result in the string table
   * being extended (if the new property names are different from those
   * already added). This function can optionally include a region for
   * the string table so that this can be part of the hash too.
   *
   * The device tree header is not included in the list.
   *
   * @fdt:	Device tree to check
   * @inc:	List of node paths to included
   * @inc_count:	Number of node paths in list
   * @exc_prop:	List of properties names to exclude
   * @exc_prop_count:	Number of properties in exclude list
   * @region:	Returns list of regions
   * @max_region:	Maximum length of region list
   * @path:	Pointer to a temporary string for the function to use for
   *		building path names
   * @path_len:	Length of path, must be large enough to hold the longest
   *		path in the tree
   * @add_string_tab:	1 to add a region for the string table
   * @return number of regions in list. If this is >max_regions then the
   * region array was exhausted. You should increase max_regions and try
   * the call again.
   */
  int fdt_find_regions(const void *fdt, char * const inc[], int inc_count,
  		     char * const exc_prop[], int exc_prop_count,
  		     struct fdt_region region[], int max_regions,
  		     char *path, int path_len, int add_string_tab);

  #endif /* _LIBFDT_H */