arm64: dts: allwinner: orange-pi-3: Enable HDMI output

Orange Pi 3 has a DDC_CEC_EN signal connected to PH2, that enables the DDC
I2C bus voltage shifter. Before EDID can be read, we need to pull PH2 high.
This is realized by the ddc-en-gpios property.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts

@@ -21,6 +21,18 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	connector {
+		compatible = "hdmi-connector";
+		ddc-en-gpios = <&pio 7 2 GPIO_ACTIVE_HIGH>; /* PH2 */
+		type = "a";
+
+		port {
+			hdmi_con_in: endpoint {
+				remote-endpoint = <&hdmi_out_con>;
+			};
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -50,6 +62,10 @@ &cpu0 {
 	cpu-supply = <&reg_dcdca>;
 };
 
+&de {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -58,6 +74,16 @@ &ehci3 {
 	status = "okay";
 };
 
+&hdmi {
+	status = "okay";
+};
+
+&hdmi_out {
+	hdmi_out_con: endpoint {
+		remote-endpoint = <&hdmi_con_in>;
+	};
+};
+
 &mmc0 {
 	vmmc-supply = <&reg_cldo1>;
 	cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>; /* PF6 */