arm64: dts: renesas: r8a774e1: Populate HDMI encoder node

Populate HDMI 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/20200812140217.24251-7-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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

@@ -2601,22 +2601,32 @@ csi40vin3: endpoint@3 {
 		};
 
 		hdmi0: hdmi@fead0000 {
+			compatible = "renesas,r8a774e1-hdmi",
+				     "renesas,rcar-gen3-hdmi";
 			reg = <0 0xfead0000 0 0x10000>;
+			interrupts = <GIC_SPI 389 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 729>,
+				 <&cpg CPG_CORE R8A774E1_CLK_HDMI>;
+			clock-names = "iahb", "isfr";
+			power-domains = <&sysc R8A774E1_PD_ALWAYS_ON>;
+			resets = <&cpg 729>;
 			status = "disabled";
 
-			/* placeholder */
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;
 
 				port@0 {
 					reg = <0>;
+					dw_hdmi0_in: endpoint {
+						remote-endpoint = <&du_out_hdmi0>;
+					};
 				};
 				port@1 {
 					reg = <1>;
 				};
 				port@2 {
+					/* HDMI sound */
 					reg = <2>;
 				};
 			};
@@ -2650,6 +2660,7 @@ du_out_rgb: endpoint {
 				port@1 {
 					reg = <1>;
 					du_out_hdmi0: endpoint {
+						remote-endpoint = <&dw_hdmi0_in>;
 					};
 				};
 				port@2 {