arm64: dts: r8a7796: salvator-x: Enable HDMI output

Enable the HDMI encoder for the M3-W Salvator-X board and hook it up to
the HDMI connector.
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-salvator-x.dts

@@ -39,3 +39,20 @@ &du {
 	clock-names = "du.0", "du.1", "du.2", "lvds.0",
 		      "dclkin.0", "dclkin.1", "dclkin.2";
 };
+
+&hdmi0 {
+	status = "okay";
+
+	ports {
+		port@1 {
+			reg = <1>;
+			rcar_dw_hdmi0_out: endpoint {
+				remote-endpoint = <&hdmi0_con>;
+			};
+		};
+	};
+};
+
+&hdmi0_con {
+	remote-endpoint = <&rcar_dw_hdmi0_out>;
+};