arm64: dts: imx8mp-debix-model-a: Enable HDMI output

Enable the HDMI output on the Debix Model A SBC, using the HDMI encoder
present in the i.MX8MP SoC.

This has been tested with a generic 1080p HDMI display, along with a
smaller 1280x800 HDMI display.
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-debix-model-a.dts

@@ -20,6 +20,18 @@ chosen {
 		stdout-path = &uart2;
 	};
 
+	hdmi-connector {
+		compatible = "hdmi-connector";
+		label = "hdmi";
+		type = "a";
+
+		port {
+			hdmi_connector_in: endpoint {
+				remote-endpoint = <&hdmi_tx_out>;
+			};
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 		pinctrl-names = "default";
@@ -94,6 +106,28 @@ ethphy0: ethernet-phy@0 { /* RTL8211E */
 	};
 };
 
+&hdmi_pvi {
+	status = "okay";
+};
+
+&hdmi_tx {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hdmi>;
+	status = "okay";
+
+	ports {
+		port@1 {
+			hdmi_tx_out: endpoint {
+				remote-endpoint = <&hdmi_connector_in>;
+			};
+		};
+	};
+};
+
+&hdmi_tx_phy {
+	status = "okay";
+};
+
 &i2c1 {
 	clock-frequency = <400000>;
 	pinctrl-names = "default";
@@ -239,6 +273,10 @@ &i2c6 {
 	status = "okay";
 };
 
+&lcdif3 {
+	status = "okay";
+};
+
 &snvs_pwrkey {
 	status = "okay";
 };
@@ -356,6 +394,15 @@ MX8MP_IOMUXC_NAND_READY_B__GPIO3_IO16				0x19
 		>;
 	};
 
+	pinctrl_hdmi: hdmigrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL			0x1c3
+			MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA			0x1c3
+			MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD				0x19
+			MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC				0x19
+		>;
+	};
+
 	pinctrl_i2c1: i2c1grp {
 		fsl,pins = <
 			MX8MP_IOMUXC_I2C1_SCL__I2C1_SCL					0x400001c2