diff --git a/Documentation/devicetree/bindings/sound/mt8183-da7219-max98357.txt b/Documentation/devicetree/bindings/sound/mt8183-da7219-max98357.txt
index f7f3b83da6300c1e292854b1f3ed6ba849c1b9e0..6787ce8789dd3742273703bba5d37474a33161ec 100644
--- a/Documentation/devicetree/bindings/sound/mt8183-da7219-max98357.txt
+++ b/Documentation/devicetree/bindings/sound/mt8183-da7219-max98357.txt
@@ -6,11 +6,15 @@ Required properties:
 - mediatek,headset-codec: the phandles of da7219 codecs
 - mediatek,platform: the phandle of MT8183 ASoC platform
 
+Optional properties:
+- mediatek,hdmi-codec: the phandles of HDMI codec
+
 Example:
 
 	sound {
 		compatible = "mediatek,mt8183_da7219_max98357";
 		mediatek,headset-codec = <&da7219>;
+		mediatek,hdmi-codec = <&it6505dptx>;
 		mediatek,platform = <&afe>;
 	};