[PATCH 2/2] Documentation: Describe the SiRF audio hub Device Tree bindings

[RongJun Ying <rjying@gmail.com>]

From: Rongjun Ying <rongjun.ying@csr.com>

Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
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 .../devicetree/bindings/sound/sirf-audio-hub.txt   |   52 ++++++++++++++++++++
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+SiRF audio hub
+
+The audio hub is the consist of an internal audio codec, internal
+audio port and i2s controller. There are sharing same register
+address space.
+
+Required properties:
+- compatible: Must be "sirf,audio-hub"
+- reg : The register address of the device
+- #address-cells: Must be 1
+- #size-cells: Must be 1
+
+Nodes:
+Internal audio codec:
+- compatible : "sirf,atlas6-audio-codec" or "sirf,prima2-audio-codec"
+- clocks: A phandle reference to the SiRF internal audio codec clock
+
+Internal audio port:
+- compatible: "sirf,audio-port"
+
+I2S controller:
+- compatible: "sirf,prima2-i2s"
+- clocks: A phandle reference to the SiRF I2S controller clock
+
+Example:
+sirf_audio_hub: audio_hub@b0040000 {
+	compatible = "sirf,audio-hub";
+	reg = <0xb0040000 0x10000>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	audiocodec: audiocodec {
+		compatible = "sirf,atlas6-audio-codec";
+		interrupts = <35>;
+		clocks = <&clks 27>;
+	};
+
+	audioport: audioport {
+		compatible = "sirf,audio-port";
+		dmas = <&dmac1 3>, <&dmac1 8>;
+		dma-names = "rx", "tx";
+	};
+
+	i2s: i2s {
+		compatible = "sirf,prima2-i2s";
+		dmas = <&dmac1 6>, <&dmac1 12>;
+		dma-names = "rx", "tx";
+		clocks = <&clks 27>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&i2s_pins_a>;
+	};
+};
-- 
1.7.5.4