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diff --git a/Documentation/devicetree/bindings/video/rockchip-drm.txt b/Documentation/devicetree/bindings/video/rockchip-drm.txt
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+Rockchip DRM master device
+================================
+
+The Rockchip DRM master device is a virtual device needed to list all
+vop devices or other display interface nodes that comprise the
+graphics subsystem.
+
+Required properties:
+- compatible: Should be "rockchip,display-subsystem"
+- ports: Should contain a list of phandles pointing to display interface port
+  of vop devices. vop definitions as defined in
+  Documentation/devicetree/bindings/video/rockchip-vop.txt
+
+example:
+
+display-subsystem {
+        compatible = "rockchip,display-subsystem";
+        ports = <&vopl_out>, <&vopb_out>;
+};