From 1889a7e275c82cfa120004595a652e834c3723e1 Mon Sep 17 00:00:00 2001
From: Peng Fan <van.freenix@gmail.com>
Date: Mon, 1 Feb 2016 13:31:15 +0800
Subject: [PATCH] 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>
---
include/fdtdec.h | 9 +++++++++
lib/fdtdec.c | 11 +++++++++++
2 files changed, 20 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h
index dd82916dc0..d1c29a8a5d 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 0eb56af4d6..1b1ca02e69 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)
{
--
2.39.5