diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
index 22d6dda587c5737f39ace88bc75e136549d9951b..7854fff4fc16687a1e136fda220c331ccdfb3ba9 100644
--- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
+++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
@@ -376,6 +376,8 @@ Required properties:
     * allwinner,sun8i-a83t-de2-mixer-0
     * allwinner,sun8i-a83t-de2-mixer-1
     * allwinner,sun8i-h3-de2-mixer-0
+    * allwinner,sun8i-r40-de2-mixer-0
+    * allwinner,sun8i-r40-de2-mixer-1
     * allwinner,sun8i-v3s-de2-mixer
     * allwinner,sun50i-a64-de2-mixer-0
     * allwinner,sun50i-a64-de2-mixer-1