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libfdt: add api fdt_node_offset_by_phandle_node() find node with phandle and start node. 

Change-Id: I3d7c710367005510ed936e75863f9d3685cb4bc5
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: cwz <cwz@rock-chips.com>
This commit is contained in:
cwz 2015-03-17 16:59:02 +08:00 committed by Kever Yang
parent f82d121178
commit d807358c86
2 changed files with 44 additions and 0 deletions
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23
lib/libfdt/fdt_ro.c
View File

@ -526,6 +526,29 @@ int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
return offset; /* error from fdt_next_node() */
}
int fdt_node_offset_by_phandle_node(const void *fdt, int node, uint32_t phandle)
{
int offset;
if ((phandle == 0) || (phandle == -1) || (node < 0))
return -FDT_ERR_BADPHANDLE;
FDT_CHECK_HEADER(fdt);
offset = node;
if (fdt_get_phandle(fdt, offset) == phandle)
return offset;
for (offset = fdt_next_node(fdt, offset, NULL);
offset >= 0;
offset = fdt_next_node(fdt, offset, NULL)) {
if (fdt_get_phandle(fdt, offset) == phandle)
return offset;
}
return offset; /* error from fdt_next_node() */
}
int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
{
int len = strlen(str);

21
lib/libfdt/libfdt.h
View File

@ -2166,6 +2166,27 @@ int fdt_next_region(const void *fdt,
int fdt_add_alias_regions(const void *fdt, struct fdt_region *region, int count,
int max_regions, struct fdt_region_state *info);
int fdt_device_is_available(const void *blob, int node);
/**
* fdt_node_offset_by_phandle_node - find the node with a given phandle and node
* @fdt: pointer to the device tree blob
* @phandle: phandle value
* @node: start node value
*
* fdt_node_offset_by_phandle_node() 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_node(const void *fdt, int node, uint32_t phandle);
#endif /* SWIG */
#endif /* _LIBFDT_H */