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authorDavid Gibson <david@gibson.dropbear.id.au>2008-08-20 16:55:14 +1000
committerGerald Van Baren <vanbaren@cideas.com>2008-10-02 19:06:09 -0400
commit9a6cf73a88ddab2e1ac39088f2806177982cc62c (patch)
tree16af8bb02d53d727c06f64852d71b20786294577 /include/libfdt.h
parent3e38577208e4256956bc33bb8bcd0a6b6fab55c3 (diff)
libfdt: Add function to explicitly expand aliases
Kumar has already added alias expansion to fdt_path_offset(). However, in some circumstances it may be convenient for the user of libfdt to explicitly get the string expansion of an alias. This patch adds a function to do this, fdt_get_alias(), and uses it to implement fdt_path_offset(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'include/libfdt.h')
-rw-r--r--include/libfdt.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index 5492a53520..7cad68c3ce 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -459,6 +459,32 @@ static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
/**
+ * fdt_get_namelen - get alias based on substring
+ * @fdt: pointer to the device tree blob
+ * @name: name of the alias th look up
+ * @namelen: number of characters of name to consider
+ *
+ * Identical to fdt_get_alias(), but only examine the first namelen
+ * characters of name for matching the alias name.
+ */
+const char *fdt_get_alias_namelen(const void *fdt,
+ const char *name, int namelen);
+
+/**
+ * fdt_get_alias - retreive the path referenced by a given alias
+ * @fdt: pointer to the device tree blob
+ * @name: name of the alias th look up
+ *
+ * fdt_get_alias() retrieves the value of a given alias. That is, the
+ * value of the property named 'name' in the node /aliases.
+ *
+ * returns:
+ * a pointer to the expansion of the alias named 'name', of it exists
+ * NULL, if the given alias or the /aliases node does not exist
+ */
+const char *fdt_get_alias(const void *fdt, const char *name);
+
+/**
* fdt_get_path - determine the full path of a node
* @fdt: pointer to the device tree blob
* @nodeoffset: offset of the node whose path to find