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libfdt: add function fdt_device_is_available 

Change-Id: Ia6c727e246339107c280f715d0e35edd54ce6dc3
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: yxj <yxj@rock-chips.com>
This commit is contained in:
yxj 2014-06-19 16:11:24 +08:00 committed by Kever Yang
parent d4bafcc833
commit f82d121178
3 changed files with 24 additions and 0 deletions
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0
include/libfdt.h Normal file → Executable file
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23
lib/libfdt/fdt_ro.c Normal file → Executable file
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@ -680,3 +680,26 @@ int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
return offset; /* error from fdt_next_node() */
}
/**
* of_device_is_available - check if a device is available for use
*
* @device: Node to check for availability
*
* Returns 1 if the status property is absent or set to "okay" or "ok",
* 0 otherwise
*/
int fdt_device_is_available(const void *blob, int node)
{
const char *cell;
cell = fdt_getprop(blob, node, "status", NULL);
if (cell) {
if (!strcmp(cell, "okay") || !strcmp(cell, "ok"))
return 1;
} else {
return 1;
}
return 0;
}

1
lib/libfdt/libfdt.h
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@ -2165,6 +2165,7 @@ 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);
#endif /* SWIG */
#endif /* _LIBFDT_H */