[PATCH] dt-bindings: sound: add dmicen property in dmic driver

[huang lin]

there may use enable pin to control dmic start and stop,
so add this property in dt-bindings.

Signed-off-by: Lin Huang <hl@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/sound/dmic.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/dmic.txt b/Documentation/devicetree/bindings/sound/dmic.txt
index a0c58f2a162a..54c8ef6498a8 100644
--- a/Documentation/devicetree/bindings/sound/dmic.txt
+++ b/Documentation/devicetree/bindings/sound/dmic.txt
@@ -5,8 +5,12 @@ This device support generic PDM digital microphone.
 Required properties:
 	- compatible: should be "dmic-codec".
 
+Optional properties:
+	- dmicen-gpios: GPIO specifier for dmic to control start and stop
+
 Example node:
 
 	dmic_codec: dmic@0 {
 		compatible = "dmic-codec";
+		dmicen-gpios = <&gpio4 3 GPIO_ACTIVE_HIGH>;
 	};
-- 
2.13.3