ASoC: ak4642: add Device Tree support

Support for loading the ak4642 codec module via devicetree.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/ak4642.txt b/Documentation/devicetree/bindings/sound/ak4642.txt
new file mode 100644
index 00000000000..623d4e70ae1
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ak4642.txt
@@ -0,0 +1,17 @@
+AK4642 I2C transmitter
+
+This device supports I2C mode only.
+
+Required properties:
+
+  - compatible : "asahi-kasei,ak4642" or "asahi-kasei,ak4643" or "asahi-kasei,ak4648"
+  - reg : The chip select number on the I2C bus
+
+Example:
+
+&i2c {
+	ak4648: ak4648@0x12 {
+		compatible = "asahi-kasei,ak4642";
+		reg = <0x12>;
+	};
+};