dt: Add documentation for the ZTE I2S controller

This patch adds the devicetree documentation for the ZTE
zx296702 I2S audio controller.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/zte,zx-i2s.txt b/Documentation/devicetree/bindings/sound/zte,zx-i2s.txt
new file mode 100644 (file)
index 0000000..7e5aa6f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/zte,zx-i2s.txt
@@ -0,0 +1,44 @@
+ZTE ZX296702 I2S controller
+
+Required properties:
+ - compatible : Must be "zte,zx296702-i2s"
+ - reg : Must contain I2S core's registers location and length
+ - clocks : Pairs of phandle and specifier referencing the controller's clocks.
+ - clock-names: "tx" for the clock to the I2S interface.
+ - dmas: Pairs of phandle and specifier for the DMA channel that is used by
+   the core. The core expects two dma channels for transmit.
+ - dma-names : Must be "tx" and "rx"
+
+For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties
+please check:
+       * resource-names.txt
+       * clock/clock-bindings.txt
+       * dma/dma.txt
+
+Example:
+       i2s0: i2s0@0b005000 {
+               #sound-dai-cells = <0>;
+               compatible = "zte,zx296702-i2s";
+               reg = <0x0b005000 0x1000>;
+               clocks = <&lsp0clk ZX296702_I2S0_DIV>;
+               clock-names = "tx";
+               interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
+               dmas = <&dma 5>, <&dma 6>;
+               dma-names = "tx", "rx";
+               status = "okay";
+       };
+
+       sound {
+               compatible = "simple-audio-card";
+               simple-audio-card,name = "zx296702_snd";
+               simple-audio-card,format = "left_j";
+               simple-audio-card,bitclock-master = <&sndcodec>;
+               simple-audio-card,frame-master = <&sndcodec>;
+               sndcpu: simple-audio-card,cpu {
+                       sound-dai = <&i2s0>;
+               };
+
+               sndcodec: simple-audio-card,codec {
+                       sound-dai = <&acodec>;
+               };
+       };