1#ifndef _LIBFDT_H
2#define _LIBFDT_H
3/*
4 * libfdt - Flat Device Tree manipulation
5 * Copyright (C) 2006 David Gibson, IBM Corporation.
6 *
7 * libfdt is dual licensed: you can use it either under the terms of
8 * the GPL, or the BSD license, at your option.

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117 * libfdt itself. */
118
119#define FDT_ERR_MAX 13
120
121/**********************************************************************/
122/* Low-level functions (you probably don't need these) */
123/**********************************************************************/
124
125const void *fdt_offset_ptr(const void *fdt, int offset, int checklen);
126static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
127{
128 return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
129}
130
131uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
132
133/**********************************************************************/

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151#define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
152#define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
153#define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
154#define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
155
156#define __fdt_set_hdr(name) \
157 static inline void fdt_set_##name(void *fdt, uint32_t val) \
158 { \
159 struct fdt_header *fdth = fdt; \
160 fdth->name = cpu_to_fdt32(val); \
161 }
162__fdt_set_hdr(magic);
163__fdt_set_hdr(totalsize);
164__fdt_set_hdr(off_dt_struct);
165__fdt_set_hdr(off_dt_strings);
166__fdt_set_hdr(off_mem_rsvmap);
167__fdt_set_hdr(version);

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338 * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
339 * -FDT_ERR_BADMAGIC,
340 * -FDT_ERR_BADVERSION,
341 * -FDT_ERR_BADSTATE, standard meanings
342 */
343const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
344
345/**
346 * fdt_get_property - find a given property in a given node
347 * @fdt: pointer to the device tree blob
348 * @nodeoffset: offset of the node whose property to find
349 * @name: name of the property to find
350 * @lenp: pointer to an integer variable (will be overwritten) or NULL
351 *
352 * fdt_get_property() retrieves a pointer to the fdt_property
353 * structure within the device tree blob corresponding to the property

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375 const char *name,
376 int *lenp)
377{
378 return (struct fdt_property *)(uintptr_t)
379 fdt_get_property(fdt, nodeoffset, name, lenp);
380}
381
382/**
383 * fdt_getprop - retrieve the value of a given property
384 * @fdt: pointer to the device tree blob
385 * @nodeoffset: offset of the node whose property to find
386 * @name: name of the property to find
387 * @lenp: pointer to an integer variable (will be overwritten) or NULL
388 *
389 * fdt_getprop() retrieves a pointer to the value of the property
390 * named 'name' of the node at offset nodeoffset (this will be a

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424 *
425 * returns:
426 * the phandle of the node at nodeoffset, on success (!= 0, != -1)
427 * 0, if the node has no phandle, or another error occurs
428 */
429uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
430
431/**
432 * fdt_get_path - determine the full path of a node
433 * @fdt: pointer to the device tree blob
434 * @nodeoffset: offset of the node whose path to find
435 * @buf: character buffer to contain the returned path (will be overwritten)
436 * @buflen: size of the character buffer at buf
437 *
438 * fdt_get_path() computes the full path of the node at offset
439 * nodeoffset, and records that path in the buffer at buf.

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