arm64: dts: mnt-reform2: add internal display support

This adds support for the internal display of the Reform2 Laptop, which
is connected to the i.MX8MQ via a MIPI-DSI->eDP bridge chip. Clocking
is derived from a system PLL, which provides quite good rate matching
for the single supported display mode and keeps the video PLL free for
usage with the external display, which isn't supported yet.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-mnt-reform2.dts

@@ -14,6 +14,30 @@ / {
 	compatible = "mntre,reform2", "boundary,imx8mq-nitrogen8m-som", "fsl,imx8mq";
 	chassis-type = "laptop";
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_backlight>;
+		pwms = <&pwm2 0 10000>;
+		power-supply = <&reg_main_usb>;
+		enable-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		brightness-levels = <0 32 64 128 160 200 255>;
+		default-brightness-level = <6>;
+	};
+
+	panel {
+		compatible = "innolux,n125hce-gn1", "simple-panel";
+		power-supply = <&reg_main_3v3>;
+		backlight = <&backlight>;
+		no-hpd;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&edp_bridge_out>;
+			};
+		};
+	};
+
 	pcie1_refclk: clock-pcie1-refclk {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
@@ -42,6 +66,22 @@ reg_main_usb: regulator-main-usb {
 		vin-supply = <&reg_main_5v>;
 	};
 
+	reg_main_1v8: regulator-main-1v8 {
+		compatible = "regulator-fixed";
+		regulator-name = "1V8";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		vin-supply = <&reg_main_3v3>;
+	};
+
+	reg_main_1v2: regulator-main-1v2 {
+		compatible = "regulator-fixed";
+		regulator-name = "1V2";
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+		vin-supply = <&reg_main_5v>;
+	};
+
 	sound {
 		compatible = "fsl,imx-audio-wm8960";
 		audio-cpu = <&sai2>;
@@ -61,6 +101,13 @@ sound {
 	};
 };
 
+&dphy {
+	assigned-clocks = <&clk IMX8MQ_CLK_DSI_PHY_REF>;
+	assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_800M>;
+	assigned-clock-rates = <25000000>;
+	status = "okay";
+};
+
 &fec1 {
 	status = "okay";
 };
@@ -84,6 +131,67 @@ rtc@68 {
 	};
 };
 
+&i2c4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c4>;
+	clock-frequency = <400000>;
+	status = "okay";
+
+	edp_bridge: bridge@2c {
+		compatible = "ti,sn65dsi86";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_edp_bridge>;
+		reg = <0x2c>;
+		enable-gpios = <&gpio3 20 GPIO_ACTIVE_HIGH>;
+		vccio-supply = <&reg_main_1v8>;
+		vpll-supply = <&reg_main_1v8>;
+		vcca-supply = <&reg_main_1v2>;
+		vcc-supply = <&reg_main_1v2>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				edp_bridge_in: endpoint {
+					remote-endpoint = <&mipi_dsi_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				edp_bridge_out: endpoint {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+		};
+	};
+};
+
+&lcdif {
+	assigned-clocks = <&clk IMX8MQ_CLK_LCDIF_PIXEL>;
+	assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_800M>;
+	/delete-property/assigned-clock-rates;
+	status = "okay";
+};
+
+&mipi_dsi {
+	status = "okay";
+
+	ports {
+		port@1 {
+			reg = <1>;
+
+			mipi_dsi_out: endpoint {
+				remote-endpoint = <&edp_bridge_in>;
+			};
+		};
+	};
+};
+
 &pcie1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie1>;
@@ -96,6 +204,13 @@ &pcie1 {
 	status = "okay";
 };
 
+&pwm2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm2>;
+	status = "okay";
+};
+
+
 &reg_1p8v {
 	vin-supply = <&reg_main_5v>;
 };
@@ -169,6 +284,18 @@ &usdhc2 {
 };
 
 &iomuxc {
+	pinctrl_backlight: backlightgrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_GPIO1_IO10_GPIO1_IO10		0x3
+		>;
+	};
+
+	pinctrl_edp_bridge: edpbridgegrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_SAI5_RXC_GPIO3_IO20		0x1
+		>;
+	};
+
 	pinctrl_i2c3: i2c3grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C3_SCL_I2C3_SCL			0x4000007f
@@ -176,12 +303,25 @@ MX8MQ_IOMUXC_I2C3_SDA_I2C3_SDA			0x4000007f
 		>;
 	};
 
+	pinctrl_i2c4: i2c4grp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C4_SCL_I2C4_SCL			0x40000022
+			MX8MQ_IOMUXC_I2C4_SDA_I2C4_SDA			0x40000022
+		>;
+	};
+
 	pinctrl_pcie1: pcie1grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SAI5_RXD2_GPIO3_IO23		0x16
 		>;
 	};
 
+	pinctrl_pwm2: pwm2grp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_SPDIF_RX_PWM2_OUT			0x3
+		>;
+	};
+
 	pinctrl_sai2: sai2grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_SAI2_RXD0_SAI2_RX_DATA0		0xd6