[PATCH v2 1/7] Documentation: of: add type property

[Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>]

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

OF graph indicates each devices connection. But it doesn't support type
of each port. For example HDMI case, it has video port and sound port
in one device node.
In this case, current driver can't handle each port correctly.
This patch enables to use type property on OF graph.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v1 -> v2
 - doesn't indicate Linux subsystem on git log
 - use HDMI example on graph.txt

 Documentation/devicetree/bindings/graph.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/devicetree/bindings/graph.txt b/Documentation/devicetree/bindings/graph.txt
index fcb1c6a..fe6c8ce 100644
--- a/Documentation/devicetree/bindings/graph.txt
+++ b/Documentation/devicetree/bindings/graph.txt
@@ -110,6 +110,27 @@ device-2 {
         };
 };
 
+port / endpoint type
+--------------------
+
+Each port can have its type if needed.
+For example HDMI case, it has video port and sound port.
+Below example indicates that port@0 is HDMI-video port,
+and port@1 is HDMI-sound port.
+
+HDMI {
+	port@0 {
+		type = "video";
+		endpoint {
+		};
+	};
+	port@1 {
+		type = "sound";
+		endpoint {
+		};
+	};
+};
+
 
 Required properties
 -------------------
-- 
1.9.1