[PATCH 17/23] of_graph: add of_graph_get_endpoint_count()

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>

OF graph want to count its endpoint number, same as
of_get_child_count(). This patch adds of_graph_get_endpoint_count()
which can check specific type. It will count all endpoint if type
was NULL.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 drivers/of/base.c        | 16 ++++++++++++++++
 include/linux/of_graph.h |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 131f416..03a5bfc 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2529,3 +2529,19 @@ bool of_graph_port_type_is(struct device_node *port, char *type)
 	return false;
 }
 EXPORT_SYMBOL(of_graph_port_type_is);
+
+int of_graph_get_endpoint_count(const struct device_node *np, char *type)
+{
+	struct device_node *port, *endpoint;
+	int num = 0;
+
+	for_each_of_endpoint(np, port, endpoint) {
+		if (!type)
+			num++;
+		else
+			num += of_graph_port_type_is(port, type);
+	}
+
+	return num;
+}
+EXPORT_SYMBOL(of_graph_get_endpoint_count);
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index eca1f3b..2d16be7 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -52,11 +52,13 @@ struct of_endpoint {
 	     child = of_graph_get_next_endpoint(parent, child))
 
 #define of_graph_port_type_is_sound(n)		of_graph_port_type_is(n, "sound")
+#define of_graph_get_sound_endpoint_count(n)	of_graph_get_endpoint_count(n, "sound")
 
 #ifdef CONFIG_OF
 int of_graph_parse_endpoint(const struct device_node *node,
 				struct of_endpoint *endpoint);
 bool of_graph_port_type_is(struct device_node *port, char *type);
+int of_graph_get_endpoint_count(const struct device_node *np, char *type);
 struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
 struct device_node *of_graph_get_top_port(struct device *dev);
 struct device_node *of_graph_get_next_port(const struct device_node *parent,
@@ -87,6 +89,12 @@ static bool of_graph_port_type_is(struct device_node *port, char *type)
 	return false;
 }
 
+static inline int of_graph_get_endpoint_count(const struct device_node *np,
+					      char *type)
+{
+	return 0;
+}
+
 static inline struct device_node *of_graph_get_port_by_id(
 					struct device_node *node, u32 id)
 {
-- 
1.9.1