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

[Kuninori Morimoto]

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

OF graph is used mainly from V4L2, but ALSA needs to use it too.
Then, ALSA needs to know each port/endpoint type, otherwise it
can't detect ALSA port/endpoint correctly.
This patch enables to use type property on OF graph.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 Documentation/devicetree/bindings/graph.txt | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/graph.txt b/Documentation/devicetree/bindings/graph.txt
index fcb1c6a..b5b9040 100644
--- a/Documentation/devicetree/bindings/graph.txt
+++ b/Documentation/devicetree/bindings/graph.txt
@@ -110,6 +110,32 @@ device-2 {
         };
 };
 
+port / endpoint type
+--------------------
+
+Each ports / port / endpoint can have its type if needed.
+child node can take over parent node type. below example indicates
+device0 type is "typeA" && "typeB",
+device1 type is "typeA" && "typeB" && "typeC".
+
+device {
+	ports {
+		type = "typeA";
+
+		port@0 {
+			type = "typeB";
+
+			device0: endpoint@0 {
+			};
+
+			device1: endpoint@1 {
+				type = "typeC";
+			};
+		};
+		...
+	};
+};
+
 
 Required properties
 -------------------
-- 
1.9.1