arm64: dts: freescale: introduce rve-gateway board

The RVE gateway board is based on a Variscite VAR-SOM-NANO,
with a NXP MX8MN nano CPU.
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/Makefile

@@ -98,6 +98,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mn-bsh-smm-s2pro.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-ddr3l-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-ddr4-evk.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mn-rve-gateway.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-tqma8mqnl-mba8mx.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-var-som-symphony.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-venice-gw7902.dtb

arch/arm64/boot/dts/freescale/imx8mn-rve-gateway.dts

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2023 DimOnOff
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/usb/pd.h>
+#include "imx8mn-var-som.dtsi"
+
+/ {
+	model = "RVE gateway";
+	compatible = "rve,rve-gateway", "variscite,var-som-mx8mn", "fsl,imx8mn";
+
+	crystal_duart_24m: crystal-duart-24m {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <24000000>;
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio_keys>;
+
+		key-enter {
+			label = "enter";
+			gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_ENTER>;
+		};
+
+		key-exit {
+			label = "exit";
+			gpios = <&gpio3 23 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_ESC>;
+		};
+	};
+
+	lcd {
+		compatible = "hit,hd44780";
+		display-height-chars = <2>;
+		display-width-chars = <20>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_lcd>;
+		data-gpios = <&gpio5  1 GPIO_ACTIVE_HIGH>,
+			     <&gpio1  6 GPIO_ACTIVE_HIGH>,
+			     <&gpio1 14 GPIO_ACTIVE_HIGH>,
+			     <&gpio4 28 GPIO_ACTIVE_HIGH>,
+			     <&gpio5 24 GPIO_ACTIVE_HIGH>,
+			     <&gpio5  2 GPIO_ACTIVE_HIGH>,
+			     <&gpio1 12 GPIO_ACTIVE_HIGH>,
+			     <&gpio5 25 GPIO_ACTIVE_HIGH>;
+		enable-gpios = <&gpio5 23 GPIO_ACTIVE_HIGH>;
+		rs-gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
+		rw-gpios = <&gpio4 27 GPIO_ACTIVE_HIGH>;
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "3P3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	/* Bourns PEC12R rotary encoder, 24 steps. */
+	rotary: rotary-encoder {
+		compatible = "rotary-encoder";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_rotary>;
+		gpios = <&gpio1  5 GPIO_ACTIVE_LOW>, /* A */
+			<&gpio3 21 GPIO_ACTIVE_LOW>; /* B */
+		linux,axis = <0>; /* REL_X */
+		rotary-encoder,encoding = "gray";
+		rotary-encoder,relative-axis;
+	};
+};
+
+&ecspi1 {
+	cs-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
+
+	duart1: serial@0 {
+		compatible = "nxp,sc16is752";
+		reg = <0>;
+		spi-rx-bus-width = <1>;
+		spi-tx-bus-width = <1>;
+		spi-max-frequency = <4000000>;
+		clocks = <&crystal_duart_24m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <22 IRQ_TYPE_EDGE_FALLING>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "RADIO0", "RADIO1", "RADIO2", "RADIO3",
+				  "RADIO4", "RADIO_RESET", "TP12", "TP11";
+		linux,rs485-enabled-at-boot-time;
+		rs485-rts-active-low;
+	};
+
+	/delete-node/ touchscreen@0;
+};
+
+&ecspi2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ecspi2>;
+	cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
+	/delete-property/ dmas;
+	/delete-property/ dma-names;
+	status = "okay";
+
+	duart2: serial@0 {
+		compatible = "nxp,sc16is752";
+		reg = <0>;
+		spi-rx-bus-width = <1>;
+		spi-tx-bus-width = <1>;
+		spi-max-frequency = <4000000>;
+		clocks = <&crystal_duart_24m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "LED_B_USER", "LED_R_USER", "LED_G_USER",
+				  "GPIO_EXT3", "GPIO_EXT2", "GPIO_EXT1",
+				  "GPIO_EXT0", "TP13";
+		linux,rs485-enabled-at-boot-time;
+		rs485-rts-active-low;
+	};
+};
+
+/* Configure PWM pins in GPIO mode: */
+&gpio5 {
+	gpio-line-names = "", "", "", "PWM3", "PWM2", "PWM1";
+};
+
+&gpu {
+	status = "disabled";
+};
+
+&i2c2 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	status = "okay";
+
+	/* Carrier board EEPROM */
+	eeprom_cb: eeprom@56 {
+		compatible = "atmel,24c04";
+		reg = <0x56>;
+		pagesize = <16>;
+		vcc-supply = <&reg_3p3v>;
+	};
+
+	lm75: sensor@48 {
+		compatible = "st,stlm75";
+		reg = <0x48>;
+		vs-supply = <&reg_3p3v>;
+	};
+
+	mcp7940: rtc@6f {
+		compatible = "microchip,mcp7940x";
+		reg = <0x6f>;
+	};
+};
+
+&i2c3 {
+	codec@1a {
+		status = "disabled";
+	};
+};
+
+&i2c4 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c4>;
+	status = "okay";
+
+	pcf8574_1: gpio@38 {
+		compatible = "nxp,pcf8574";
+		reg = <0x38>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "LED_B_COMM3", "LED_R_COMM3", "LED_G_COMM3",
+				  "TP14", "TP15", "LED_G_COMM4", "LED_R_COMM4",
+				  "LED_B_COMM4";
+	};
+
+	pcf8574_2: gpio@39 {
+		compatible = "nxp,pcf8574";
+		reg = <0x39>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "LED_B_COMM2", "LED_G_COMM2", "LED_B_COMM1",
+				  "LED_R_COMM2", "LED_R_COMM1", "LED_G_COMM1",
+				  "TP16", "TP17";
+	};
+};
+
+/* Bluetooth */
+&uart2 {
+	status = "disabled";
+};
+
+&usbotg1 {
+	dr_mode = "host";
+	disable-over-current;
+	status = "okay";
+};
+
+/* SD interface on expansion connector. */
+&usdhc2 {
+	vmmc-supply = <&reg_3p3v>;
+	cd-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
+};
+
+&iomuxc {
+	pinctrl_ecspi1: ecspi1grp {
+		fsl,pins = <
+			MX8MN_IOMUXC_ECSPI1_SCLK_ECSPI1_SCLK	0x13
+			MX8MN_IOMUXC_ECSPI1_MOSI_ECSPI1_MOSI	0x13
+			MX8MN_IOMUXC_ECSPI1_MISO_ECSPI1_MISO	0x13
+			MX8MN_IOMUXC_ECSPI1_SS0_GPIO5_IO9	0x13 /* SS0 */
+			MX8MN_IOMUXC_SAI5_RXD1_GPIO3_IO22	0x13 /* SC16 IRQ */
+		>;
+	};
+
+	pinctrl_ecspi2: ecspi2grp {
+		fsl,pins = <
+			MX8MN_IOMUXC_ECSPI2_SCLK_ECSPI2_SCLK	0x13
+			MX8MN_IOMUXC_ECSPI2_MOSI_ECSPI2_MOSI	0x13
+			MX8MN_IOMUXC_ECSPI2_MISO_ECSPI2_MISO	0x13
+			MX8MN_IOMUXC_ECSPI2_SS0_GPIO5_IO13	0x13 /* SS0 */
+			MX8MN_IOMUXC_SAI5_RXC_GPIO3_IO20	0x13 /* SC16 IRQ */
+		>;
+	};
+
+	pinctrl_gpio_keys: gpiokeysgrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_GPIO1_IO01_GPIO1_IO1	0xc6 /* Enter */
+			MX8MN_IOMUXC_SAI5_RXD2_GPIO3_IO23	0xc6 /* Exit */
+		>;
+	};
+
+	pinctrl_i2c2: i2c2grp {
+		fsl,pins = <
+			MX8MN_IOMUXC_I2C2_SCL_I2C2_SCL		0x400001c3
+			MX8MN_IOMUXC_I2C2_SDA_I2C2_SDA		0x400001c3
+		>;
+	};
+
+	pinctrl_i2c4: i2c4grp {
+		fsl,pins = <
+			MX8MN_IOMUXC_I2C4_SCL_I2C4_SCL		0x400001c3
+			MX8MN_IOMUXC_I2C4_SDA_I2C4_SDA		0x400001c3
+		>;
+	};
+
+	pinctrl_lcd: lcdgrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_SAI3_TXD_GPIO5_IO1		0x00000156 /* D0 */
+			MX8MN_IOMUXC_GPIO1_IO06_GPIO1_IO6	0x00000156 /* D1 */
+			MX8MN_IOMUXC_GPIO1_IO14_GPIO1_IO14	0x00000156 /* D2 */
+			MX8MN_IOMUXC_SAI3_RXFS_GPIO4_IO28	0x00000156 /* D3 */
+			MX8MN_IOMUXC_UART2_RXD_GPIO5_IO24	0x00000156 /* D4 */
+			MX8MN_IOMUXC_SAI3_MCLK_GPIO5_IO2	0x00000156 /* D5 */
+			MX8MN_IOMUXC_GPIO1_IO12_GPIO1_IO12	0x00000156 /* D6 */
+			MX8MN_IOMUXC_UART2_TXD_GPIO5_IO25	0x00000156 /* D7 */
+			MX8MN_IOMUXC_UART1_TXD_GPIO5_IO23	0x00000156 /* E */
+			MX8MN_IOMUXC_GPIO1_IO07_GPIO1_IO7	0x00000156 /* RS */
+			MX8MN_IOMUXC_SAI2_MCLK_GPIO4_IO27	0x00000156 /* R/W */
+		>;
+	};
+
+	pinctrl_rotary: rotarygrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_GPIO1_IO05_GPIO1_IO5	0x00000156 /* A */
+			MX8MN_IOMUXC_SAI5_RXD0_GPIO3_IO21	0x00000156 /* B */
+		>;
+	};
+
+	/* Override Card Detect function GPIO value (GPIO1_IO10) from SOM: */
+	pinctrl_usdhc2_gpio: usdhc2gpiogrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_GPIO1_IO13_GPIO1_IO13	0x41
+		>;
+	};
+};