[PATCH v3 6/7] ASoC: add audio-graph-card document

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

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

"Audio Graph Card" = "Simple Card" + "OF-graph"

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v2 -> v3

 - simple-graph-card -> audio-graph-card
 - cleanup unnecessary comments

 .../devicetree/bindings/sound/audio-graph-card.txt | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/audio-graph-card.txt

diff --git a/Documentation/devicetree/bindings/sound/audio-graph-card.txt b/Documentation/devicetree/bindings/sound/audio-graph-card.txt
new file mode 100644
index 0000000..81213ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/audio-graph-card.txt
@@ -0,0 +1,126 @@
+Audio Graph Card:
+
+Audio Graph Card specifies audio DAI connections of SoC <-> codec.
+It is based on common bindings for device graphs.
+see ${LINUX}/Documentation/devicetree/bindings/graph.txt
+
+Basically, Audio Graph Card property is same as Simple Card.
+see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
+
+Below are same as Simple-Card.
+
+- audio-graph-card,name
+- audio-graph-card,format
+- audio-graph-card,frame-master
+- audio-graph-card,bitclock-master
+- audio-graph-card,bitclock-inversion
+- audio-graph-card,frame-inversion
+- audio-graph-card,dai-tdm-slot-num
+- audio-graph-card,dai-tdm-slot-width
+- clocks / system-clock-frequency
+
+Required properties:
+
+- compatible				: "asoc-audio-graph-card";
+- dais					: list of CPU DAI port{s}
+
+Example: Single DAI case
+
+	sound_card {
+		compatible = "asoc-audio-graph-card";
+
+		dais = <&cpu_port>;
+	};
+
+	dai-controller@0 {
+		...
+		cpu_port: port {
+			cpu_endpoint: endpoint {
+				remote-endpoint = <&codec_endpoint>;
+
+				audio-graph-card,format = "left_j";
+				audio-graph-card,xxx = ...
+				...
+			};
+		};
+	};
+
+	dai-controller@1 {
+		...
+		port {
+			codec_endpoint: endpoint {
+				remote-endpoint = <&cpu_endpoint>;
+			};
+		};
+	};
+
+Example: Multi DAI case
+
+	sound_card {
+		compatible = "asoc-audio-graph-card";
+
+		dais = <&cpu_port0
+			&cpu_port1
+			&cpu_port2>;
+	};
+
+	dai-controller@0 {
+		...
+		port {
+			codec0_endpoint: endpoint {
+				remote-endpoint = <&cpu_endpoint0>;
+			};
+		};
+	};
+
+	dai-controller@1 {
+		...
+		port {
+			codec1_endpoint: endpoint {
+				remote-endpoint = <&cpu_endpoint1>;
+			};
+		};
+	};
+
+	dai-controller@2 {
+		...
+		port {
+			codec2_endpoint: endpoint {
+				remote-endpoint = <&cpu_endpoint2>;
+			};
+		};
+	};
+
+	dai-controller@3 {
+		...
+		ports {
+			cpu_port0: port@0 {
+				cpu_endpoint0: endpoint {
+					remote-endpoint = <&codec0_endpoint>;
+
+					audio-graph-card,format = "left_j";
+					audio-graph-card,xxx = ...
+					...
+				};
+			};
+			cpu_port1: port@1 {
+				cpu_endpoint1: endpoint {
+					remote-endpoint = <&codec1_endpoint>;
+
+					audio-graph-card,format = "i2s";
+					audio-graph-card,xxx = ...
+					...
+				};
+			};
+			cpu_port2: port@2 {
+				cpu_endpoint2: endpoint {
+					remote-endpoint = <&codec2_endpoint>;
+
+					audio-graph-card,format = "i2s";
+					audio-graph-card,xxx = ...
+					...
+				};
+			};
+		};
+	};
+
-- 
1.9.1