Add EV-iMX280-NANO-X-MB board

A simple prototyping board with one microSD port, one Ethernet port,
2 USB ports, I2C, SPI, GPIO, and UART interfaces.

Signed-off-by: Oleh Kravchenko <oleg@kaa.org.ua>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/dts/Makefile

@@ -822,6 +822,9 @@ dtb-$(CONFIG_ARCH_MX6) += \
 dtb-$(CONFIG_O4_IMX_NANO) += \
 	o4-imx-nano.dtb
 
+dtb-$(CONFIG_EV_IMX280_NANO_X_MB) += \
+	ev-imx280-nano-x-mb.dtb
+
 dtb-$(CONFIG_MX7) += imx7d-sdb.dtb \
 	imx7d-sdb-qspi.dtb \
 	imx7-cm.dtb \

arch/arm/dts/ev-imx280-nano-x-mb.dts

@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright (C) 2021 Oleh Kravchenko <oleg@kaa.org.ua>
+
+/dts-v1/;
+
+#include "o4-imx6ull-nano.dtsi"
+
+/ {
+	model = "EV-iMX280-NANO-X-MB";
+	compatible = "evodbg,ev-imx280-nano-x-mb",
+		     "out4,o4-imx6ull-nano",
+		     "fsl,imx6ull";
+
+	aliases {
+		mmc1 = &usdhc1;
+	};
+
+	chosen {
+		stdout-path = &uart1;
+	};
+};
+
+&iomuxc {
+	pinctrl_uart1: uart1grp {
+		fsl,pins = <
+			MX6UL_PAD_UART1_RX_DATA__UART1_DCE_RX	0x1b0b1
+			MX6UL_PAD_UART1_TX_DATA__UART1_DCE_TX	0x1b0b1
+		>;
+	};
+
+	pinctrl_usdhc1: usdhc1grp {
+		fsl,pins = <
+			MX6UL_PAD_SD1_CLK__USDHC1_CLK		0x10069
+			MX6UL_PAD_SD1_CMD__USDHC1_CMD		0x17059
+			MX6UL_PAD_SD1_DATA0__USDHC1_DATA0	0x17059
+			MX6UL_PAD_SD1_DATA1__USDHC1_DATA1	0x17059
+			MX6UL_PAD_SD1_DATA2__USDHC1_DATA2	0x17059
+			MX6UL_PAD_SD1_DATA3__USDHC1_DATA3	0x17059
+			MX6UL_PAD_UART1_RTS_B__USDHC1_CD_B	0x03029
+		>;
+	};
+
+	pinctrl_mdio: mdiogrp {
+		fsl,pins = <
+			MX6UL_PAD_GPIO1_IO06__ENET1_MDIO	0x1b0b0
+			MX6UL_PAD_GPIO1_IO07__ENET1_MDC		0x1b0b0
+			MX6UL_PAD_SNVS_TAMPER1__GPIO5_IO01	0xb0b0 /* RST */
+		>;
+	};
+
+	pinctrl_usb_otg1_id: usbotg1idgrp {
+		fsl,pins = <
+			MX6UL_PAD_GPIO1_IO00__ANATOP_OTG1_ID	0x17059
+		>;
+	};
+};
+
+&uart1 {
+	pinctrl-0 = <&pinctrl_uart1>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&usdhc1 {
+	bus-width = <4>;
+	no-1-8-v;
+	pinctrl-0 = <&pinctrl_usdhc1>;
+	pinctrl-names = "default";
+	status = "okay";
+	wakeup-source;
+};
+
+&fec1 {
+	phy-handle = <&phy0>;
+	phy-mode = "rmii";
+	phy-reset-duration = <250>;
+	phy-reset-post-delay = <100>;
+	phy-reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;
+	pinctrl-0 = <&pinctrl_fec1 &pinctrl_mdio>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		phy0: ethernet-phy@0 {
+			clocks = <&clks IMX6UL_CLK_ENET_REF>;
+			clock-names = "rmii-ref";
+			interrupt-parent = <&gpio5>;
+			interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+			pinctrl-0 = <&pinctrl_phy0_irq>;
+			pinctrl-names = "default";
+			reg = <0>;
+		};
+	};
+};
+
+&usbotg1 {
+	dr_mode = "otg";
+	pinctrl-0 = <&pinctrl_usb_otg1_id>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&usbotg2 {
+	dr_mode = "host";
+	status = "okay";
+};