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libfdt: Add support for using aliases in fdt_path_offset() 

If the path doesn't start with '/' check to see if it matches some alias
under "/aliases" and substitute the matching alias value in the path
and retry the lookup.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>
This commit is contained in:
Kumar Gala 2008-08-14 08:28:19 -05:00 committed by Gerald Van Baren
parent 0219399a4e
commit feeca3f578
1 changed files with 19 additions and 2 deletions
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21
libfdt/fdt_ro.c
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@ -143,8 +143,25 @@ int fdt_path_offset(const void *fdt, const char *path)
FDT_CHECK_HEADER(fdt);
if (*path != '/')
return -FDT_ERR_BADPATH;
/* see if we have an alias */
if (*path != '/') {
const char *q;
int aliasoffset = fdt_path_offset(fdt, "/aliases");
if (aliasoffset < 0)
return -FDT_ERR_BADPATH;
q = strchr(path, '/');
if (!q)
q = end;
p = fdt_getprop_namelen(fdt, aliasoffset, path, q - p, NULL);
if (!p)
return -FDT_ERR_BADPATH;
offset = fdt_path_offset(fdt, p);
p = q;
}
while (*p) {
const char *q;