Introduce fdtdec_get_child_count for get the number of subnodes of one parent node.
Signed-off-by: Peng Fan van.freenix@gmail.com Cc: Simon Glass sjg@chromium.org ---
V2: correct spell error. renamed to fdtdec_get_child_count, move code to lib/fdtdec.c and add prototype in include/fdtdec.h
include/fdtdec.h | 9 +++++++++ lib/fdtdec.c | 11 +++++++++++ 2 files changed, 20 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h index dd82916..d1c29a8 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -722,6 +722,15 @@ const u32 *fdtdec_locate_array(const void *blob, int node, */ int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
+/* + * Count child nodes of one parent node. + * + * @param blob FDT blob + * @param node parent node + * @return number of child node; 0 if there is not child node + */ +int fdtdec_get_child_count(const void *blob, int node); + /** * Look in the FDT for a config item with the given name and return its value * as a 32-bit integer. The property must have at least 4 bytes of data. The diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 0eb56af..1b1ca02 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -831,6 +831,17 @@ int fdtdec_parse_phandle_with_args(const void *blob, int src_node, return rc; }
+int fdtdec_get_child_count(const void *blob, int node) +{ + int subnode; + int num = 0; + + fdt_for_each_subnode(blob, subnode, node) + num++; + + return num; +} + int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, u8 *array, int count) {