ASoC: Add bindings for DMIC codec driver

This patch adds documentation of device tree bindings for audio DMIC codec.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/dmic.txt b/Documentation/devicetree/bindings/sound/dmic.txt
new file mode 100644 (file)
index 0000000..a0c58f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/dmic.txt
@@ -0,0 +1,12 @@
+Device-Tree bindings for Digital microphone (DMIC) codec
+
+This device support generic PDM digital microphone.
+
+Required properties:
+       - compatible: should be "dmic-codec".
+
+Example node:
+
+       dmic_codec: dmic@0 {
+               compatible = "dmic-codec";
+       };