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authorKumar Gala <galak@kernel.crashing.org>2008-08-14 08:28:19 -0500
committerGerald Van Baren <vanbaren@cideas.com>2008-08-24 22:20:50 -0400
commitfeeca3f578b7f53c032ba203698751c982f8bf5a (patch)
treea5fa94b8160afd4dd98466090b827b5e0ba6c69d
parent0219399a4e3a8edb428e1924e1a03d58cccf8d8e (diff)
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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>
-rw-r--r--libfdt/fdt_ro.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index d566eba..b09a6e9 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -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;