ASoC: rk3308_codec: Add bindings documentation for RK3308 audio codec

Change-Id: I5163dcf9f463ef75120d4c29581f5db3eceb5c1c
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.txt b/Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.txt
new file mode 100644
index 000000000000..689a65c670e3
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+++ b/Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.txt
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+* Rockchip RK3308 Internal Codec
+
+Required properties:
+
+- compatible: "rockchip,rk3308-codec"
+- reg: The physical base address of the controller and length of memory
+  mapped region.
+- rockchip,grf: The phandle of the syscon node for GRF register.
+- clocks: A list of phandle + clock-specifer pairs, one for each entry in
+  clock-names.
+- clock-names: It should be "acodec".
+- resets : Must contain an entry for each entry in reset-names.
+- reset-names : Must include the following entries: "acodec-reset".
+- spk_ctl-gpios: The gpio of speak controller.
+
+Example for rk3308 internal codec:
+
+acodec: acodec@ff560000 {
+	compatible = "rockchip,rk3308-codec";
+	reg = <0x0 0xff560000 0x0 0x10000>;
+	rockchip,grf = <&grf>;
+	clocks = <&cru PCLK_ACODEC>;
+	clock-names = "acodec";
+	resets = <&cru SRST_ACODEC_P>;
+	reset-names = "acodec-reset";
+	spk_ctl-gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};