arm64: dts: renesas: r8a774e1: Populate DU device node

Populate the DU device node properties in R8A774E1 SoC dtsi.
Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20200812140217.24251-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a774e1.dtsi

@@ -2623,22 +2623,39 @@ port@2 {
 		};
 
 		du: display@feb00000 {
+			compatible = "renesas,du-r8a774e1";
 			reg = <0 0xfeb00000 0 0x80000>;
+			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 268 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 270 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 724>,
+				 <&cpg CPG_MOD 723>,
+				 <&cpg CPG_MOD 721>;
+			clock-names = "du.0", "du.1", "du.3";
+			resets = <&cpg 724>, <&cpg 722>;
+			reset-names = "du.0", "du.3";
 			status = "disabled";
 
-			/* placeholder */
+			renesas,vsps = <&vspd0 0>, <&vspd1 0>, <&vspd0 1>;
+
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;
 
 				port@0 {
 					reg = <0>;
+					du_out_rgb: endpoint {
+					};
 				};
 				port@1 {
 					reg = <1>;
+					du_out_hdmi0: endpoint {
+					};
 				};
 				port@2 {
 					reg = <2>;
+					du_out_lvds0: endpoint {
+					};
 				};
 			};
 		};