arm64: dts: r8a7796: Add DU device to DT

Add the DU device to r8a7796.dtsi in a disabled state.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7796.dtsi

@@ -1666,7 +1666,21 @@ fcpvd2: fcp@fea37000 {
 		};
 
 		du: display@feb00000 {
-			/* placeholder */
+			compatible = "renesas,du-r8a7796";
+			reg = <0 0xfeb00000 0 0x70000>,
+			      <0 0xfeb90000 0 0x14>;
+			reg-names = "du", "lvds.0";
+			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 268 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 269 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 724>,
+				 <&cpg CPG_MOD 723>,
+				 <&cpg CPG_MOD 722>,
+				 <&cpg CPG_MOD 727>;
+			clock-names = "du.0", "du.1", "du.2", "lvds.0";
+			status = "disabled";
+
+			vsps = <&vspd0 &vspd1 &vspd2>;
 
 			ports {
 				#address-cells = <1>;
@@ -1677,6 +1691,16 @@ port@0 {
 					du_out_rgb: endpoint {
 					};
 				};
+				port@1 {
+					reg = <1>;
+					du_out_hdmi0: endpoint {
+					};
+				};
+				port@2 {
+					reg = <2>;
+					du_out_lvds0: endpoint {
+					};
+				};
 			};
 		};