fdt: introduce fdtdec_get_child_count

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>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/include/fdtdec.h b/include/fdtdec.h
index dd82916..d1c29a8 100644 (file)
--- 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 (file)
--- 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)
 {