arm64: dts: imx8mp: add imx8mp-venice-gw74xx-rpidsi overlay for display

Add support for the following Raspberry Pi displays:
 - DFROBOT DRF0678 7in 800x480 TFT DSI capacitive touch
 - DFROBOT DRF0550 5in 800x480 TFT DSI capacitive touch

Both have the following hardware:
 - FocalTech FT5406 10pt touch controller (with no interrupt)
 - Powertip PH800480T013-IDF02 compatible panel
 - Toshiba TC358762 compatible DSI to DBI bridge
 - ATTINY based regulator used for backlight controller and panel enable

Support is added via a device-tree overlay. The touch controller is not
yet supported as polling mode is needed.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Gateworks

arch/arm64/boot/dts/freescale/Makefile

@@ -153,6 +153,7 @@ imx8mm-venice-gw73xx-0x-rpidsi-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice
 imx8mm-venice-gw73xx-0x-rs232-rts-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs232-rts.dtbo
 imx8mm-venice-gw73xx-0x-rs422-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs422.dtbo
 imx8mm-venice-gw73xx-0x-rs485-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs485.dtbo
+imx8mp-venice-gw74xx-rpidsi-dtbs	:= imx8mp-venice-gw74xx.dtb imx8mp-venice-gw74xx-rpidsi.dtbo
 
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw72xx-0x-imx219.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw72xx-0x-rpidsi.dtb
@@ -164,6 +165,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rpidsi.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs232-rts.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs422.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs485.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-venice-gw74xx-rpidsi.dtb
 
 dtb-$(CONFIG_ARCH_S32) += s32g274a-evb.dtb
 dtb-$(CONFIG_ARCH_S32) += s32g274a-rdb2.dtb

arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx-rpidsi.dtso

@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2023 Gateworks Corporation
+ */
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+	compatible = "gateworks,imx8mp-gw74xx", "fsl,imx8mp";
+
+	panel {
+		compatible = "powertip,ph800480t013-idf02";
+		power-supply = <&attiny>;
+		backlight = <&attiny>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&bridge_out>;
+			};
+		};
+	};
+};
+
+&i2c4 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	attiny: regulator@45 {
+		compatible = "raspberrypi,7inch-touchscreen-panel-regulator";
+		reg = <0x45>;
+	};
+};
+
+&lcdif1 {
+	status = "okay";
+};
+
+&mipi_dsi {
+	samsung,burst-clock-frequency = <891000000>;
+	samsung,esc-clock-frequency = <54000000>;
+	samsung,pll-clock-frequency = <27000000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	bridge@0 {
+		compatible = "toshiba,tc358762";
+		reg = <0>;
+		vddc-supply = <&attiny>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				bridge_in: endpoint {
+					remote-endpoint = <&dsi_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				bridge_out: endpoint {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+		};
+	};
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+
+			dsi_out: endpoint {
+				data-lanes = <1 2>;
+				remote-endpoint = <&bridge_in>;
+			};
+		};
+	};
+};