diff --git a/Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.txt b/Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.txt
index 2469588c7ccb..1ecd75d2032a 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,rk3328-codec.txt
@@ -10,6 +10,11 @@ Required properties:
 - clock-names: should be "pclk".
 - spk-depop-time-ms: speak depop time msec.
 
+Optional properties:
+
+- mute-gpios: GPIO specifier for external line driver control (typically the
+              dedicated GPIO_MUTE pin)
+
 Example for rk3328 internal codec:
 
 codec: codec@ff410000 {
@@ -18,6 +23,6 @@ codec: codec@ff410000 {
 	rockchip,grf = <&grf>;
 	clocks = <&cru PCLK_ACODEC>;
 	clock-names = "pclk";
+	mute-gpios = <&grf_gpio 0 GPIO_ACTIVE_LOW>;
 	spk-depop-time-ms = 100;
-	status = "disabled";
 };