dt-bindings: display: renesas: Add R-Car LVDS encoder DT bindings

The Renesas R-Car Gen2 and Gen3 SoCs have internal LVDS encoders. Add
corresponding device tree bindings.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt

+Renesas R-Car LVDS Encoder
+==========================
+
+These DT bindings describe the LVDS encoder embedded in the Renesas R-Car
+Gen2, R-Car Gen3 and RZ/G SoCs.
+
+Required properties:
+
+- compatible : Shall contain one of
+  - "renesas,r8a7743-lvds" for R8A7743 (RZ/G1M) compatible LVDS encoders
+  - "renesas,r8a7790-lvds" for R8A7790 (R-Car H2) compatible LVDS encoders
+  - "renesas,r8a7791-lvds" for R8A7791 (R-Car M2-W) compatible LVDS encoders
+  - "renesas,r8a7793-lvds" for R8A7793 (R-Car M2-N) compatible LVDS encoders
+  - "renesas,r8a7795-lvds" for R8A7795 (R-Car H3) compatible LVDS encoders
+  - "renesas,r8a7796-lvds" for R8A7796 (R-Car M3-W) compatible LVDS encoders
+
+- reg: Base address and length for the memory-mapped registers
+- clocks: A phandle + clock-specifier pair for the functional clock
+- resets: A phandle + reset specifier for the module reset
+
+Required nodes:
+
+The LVDS encoder has two video ports. Their connections are modelled using the
+OF graph bindings specified in Documentation/devicetree/bindings/graph.txt.
+
+- Video port 0 corresponds to the parallel RGB input
+- Video port 1 corresponds to the LVDS output
+
+Each port shall have a single endpoint.
+
+
+Example:
+
+	lvds0: lvds@feb90000 {
+		compatible = "renesas,r8a7790-lvds";
+		reg = <0 0xfeb90000 0 0x1c>;
+		clocks = <&cpg CPG_MOD 726>;
+		resets = <&cpg 726>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				lvds0_in: endpoint {
+					remote-endpoint = <&du_out_lvds0>;
+				};
+			};
+			port@1 {
+				reg = <1>;
+				lvds0_out: endpoint {
+				};
+			};
+		};
+	};

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@@ -4744,6 +4744,7 @@ F:	drivers/gpu/drm/rcar-du/
 F:	drivers/gpu/drm/shmobile/
 F:	include/linux/platform_data/shmob_drm.h
 F:	Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
+F:	Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
 F:	Documentation/devicetree/bindings/display/renesas,du.txt
 
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