ASoC: dt-bindings: add bindings for AK4118 transceiver

Document the bindings for AK4118 S/PDIF transceiver

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/ak4118.txt b/Documentation/devicetree/bindings/sound/ak4118.txt
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+AK4118 S/PDIF transceiver
+
+This device supports I2C mode.
+
+Required properties:
+
+- compatible : "asahi-kasei,ak4118"
+- reg : The I2C address of the device for I2C
+- reset-gpios: A GPIO specifier for the reset pin
+- irq-gpios: A GPIO specifier for the IRQ pin
+
+Example:
+
+&i2c {
+       ak4118: ak4118@13 {
+               #sound-dai-cells = <0>;
+               compatible = "asahi-kasei,ak4118";
+               reg = <0x13>;
+               reset-gpios = <&gpio 0 GPIO_ACTIVE_LOW>
+               irq-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+       };
+};