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fdt: Add fdt_node_offset_by_compat_reg helper

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Given a compatible string and physical address try and find a node that
matches.  This is useful when we want to find a specific device node to
update (for example if we have multiple PCI nodes we can use the
physical address to distinguish them when trying to update the device
tree).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>
This commit is contained in:
Kumar Gala 2010-07-04 12:48:21 -05:00
parent a0342c0804
commit 75e73afd57
2 changed files with 29 additions and 0 deletions
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27
common/fdt_support.c
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@ -1125,3 +1125,30 @@ u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr)
{
return __of_translate_address(blob, node_offset, in_addr, "ranges");
}
/**
* fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
* who's reg property matches a physical cpu address
*
* @blob: ptr to device tree
* @compat: compatiable string to match
* @compat_off: property name
*
*/
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
phys_addr_t compat_off)
{
int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
while (off != -FDT_ERR_NOTFOUND) {
u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", &len);
if (reg) {
if (compat_off == fdt_translate_address(blob, off, reg))
return off;
}
off = fdt_node_offset_by_compatible(blob, off, compat);
}
return -FDT_ERR_NOTFOUND;
}

2
include/fdt_support.h
View file

@ -84,6 +84,8 @@ int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size);
void fdt_fixup_mtdparts(void *fdt, void *node_info, int node_info_size);
void fdt_del_node_and_alias(void *blob, const char *alias);
u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr);
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
phys_addr_t compat_off);
#endif /* ifdef CONFIG_OF_LIBFDT */
#endif /* ifndef __FDT_SUPPORT_H */