ASoC: Add ADAU7002 Stereo PDM-to-I2S/TDM Converter DT bindings

The ADAU7002 takes a stereo PDM signal (e.g. from two digital microphones)
and converts it into a I2S/TDM PCM stream. The chip does not have a
control interface and has a single power supply that is modeled in the
devicetree.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/adi,adau7002.txt b/Documentation/devicetree/bindings/sound/adi,adau7002.txt
new file mode 100644 (file)
index 0000000..f144ee1
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/adi,adau7002.txt
@@ -0,0 +1,19 @@
+Analog Devices ADAU7002 Stereo PDM-to-I2S/TDM Converter
+
+Required properties:
+
+ - compatible: Must be "adi,adau7002"
+
+Optional properties:
+
+ - IOVDD-supply: Phandle and specifier for the power supply providing the IOVDD
+       supply as covered in Documentation/devicetree/bindings/regulator/regulator.txt
+
+       If this property is not present it is assumed that the supply pin is
+       hardwired to always on.
+
+Example:
+       adau7002: pdm-to-i2s {
+               compatible = "adi,adau7002";
+               IOVDD-supply = <&supply>;
+       };