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
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