arm64: dts: imx8mp: Add Engicam i.Core MX8M Plus SoM

i.Core MX8M Plus is an EDIMM SoM based on NXP i.MX8M Plus
from Engicam.

General features:
- NXP i.MX8M Plus
- Up to 4GB LDDR4
- 8 eMMC
- Gigabit Ethernet
- USB 3.0, 2.0 Host/OTG
- PCIe 3.0 interface
- I2S
- LVDS
- rest of i.MX8M Plus features

i.Core MX8M Plus needs to mount on top of Engicam baseboards
for creating complete platform solutions.

Add support for it.
Signed-off-by: NManoj Sai <abbaraju.manojsai@amarulasolutions.com>
Signed-off-by: NMatteo Lisi <matteo.lisi@engicam.com>
Reviewed-by: NJagan Teki <jagan@amarulasolutions.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-icore-mx8mp.dtsi

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2018 NXP
+ * Copyright (c) 2019 Engicam srl
+ * Copyright (c) 2020 Amarula Solutons(India)
+ */
+
+/ {
+	compatible = "engicam,icore-mx8mp", "fsl,imx8mp";
+};
+
+&A53_0 {
+	cpu-supply = <&buck2>;
+};
+
+&A53_1 {
+	cpu-supply = <&buck2>;
+};
+
+&A53_2 {
+	cpu-supply = <&buck2>;
+};
+
+&A53_3 {
+	cpu-supply = <&buck2>;
+};
+
+&i2c1 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c1>;
+	status = "okay";
+
+	pca9450: pmic@25 {
+		compatible = "nxp,pca9450c";
+		interrupt-parent = <&gpio3>;
+		interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pmic>;
+		reg = <0x25>;
+
+		regulators {
+			buck1: BUCK1 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-min-microvolt = <720000>;
+				regulator-max-microvolt = <1000000>;
+				regulator-name = "BUCK1";
+				regulator-ramp-delay = <3125>;
+			};
+
+			buck2: BUCK2  {
+				nxp,dvs-run-voltage = <950000>;
+				nxp,dvs-standby-voltage = <850000>;
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <1025000>;
+				regulator-min-microvolt = <720000>;
+				regulator-name = "BUCK2";
+				regulator-ramp-delay = <3125>;
+			};
+
+			buck4: BUCK4 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <3600000>;
+				regulator-min-microvolt = <3000000>;
+				regulator-name = "BUCK4";
+			};
+
+			buck5: BUCK5 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <1950000>;
+				regulator-min-microvolt = <1650000>;
+				regulator-name = "BUCK5";
+			};
+
+			buck6: BUCK6 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <1155000>;
+				regulator-min-microvolt = <1045000>;
+				regulator-name = "BUCK6";
+			};
+
+			ldo1: LDO1 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <1950000>;
+				regulator-min-microvolt = <1650000>;
+				regulator-name = "LDO1";
+			};
+
+			ldo3: LDO3 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <1890000>;
+				regulator-min-microvolt = <1710000>;
+				regulator-name = "LDO3";
+			};
+
+			ldo5: LDO5 {
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-max-microvolt = <3300000>;
+				regulator-min-microvolt = <1800000>;
+				regulator-name = "LDO5";
+			};
+		};
+	};
+};
+
+/* EMMC */
+&usdhc3 {
+	bus-width = <8>;
+	non-removable;
+	pinctrl-names = "default", "state_100mhz", "state_200mhz";
+	pinctrl-0 = <&pinctrl_usdhc3>;
+	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
+	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_i2c1: i2c1grp {
+		fsl,pins = <
+			MX8MP_IOMUXC_I2C1_SCL__I2C1_SCL		0x400001c3
+			MX8MP_IOMUXC_I2C1_SDA__I2C1_SDA		0x400001c3
+		>;
+	};
+
+	pinctrl_pmic: pmicgrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_NAND_CE0_B__GPIO3_IO01	  0x41
+		>;
+	};
+
+	pinctrl_usdhc3: usdhc3grp {
+		fsl,pins = <
+			MX8MP_IOMUXC_NAND_WE_B__USDHC3_CLK	0x190
+			MX8MP_IOMUXC_NAND_WP_B__USDHC3_CMD	0x1d0
+			MX8MP_IOMUXC_NAND_DATA04__USDHC3_DATA0	0x1d0
+			MX8MP_IOMUXC_NAND_DATA05__USDHC3_DATA1	0x1d0
+			MX8MP_IOMUXC_NAND_DATA06__USDHC3_DATA2	0x1d0
+			MX8MP_IOMUXC_NAND_DATA07__USDHC3_DATA3	0x1d0
+			MX8MP_IOMUXC_NAND_RE_B__USDHC3_DATA4	0x1d0
+			MX8MP_IOMUXC_NAND_CE2_B__USDHC3_DATA5	0x1d0
+			MX8MP_IOMUXC_NAND_CE3_B__USDHC3_DATA6	0x1d0
+			MX8MP_IOMUXC_NAND_CLE__USDHC3_DATA7	0x1d0
+			MX8MP_IOMUXC_NAND_CE1_B__USDHC3_STROBE	0x190
+		>;
+	};
+
+	pinctrl_usdhc3_100mhz: usdhc3-100mhzgrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_NAND_WE_B__USDHC3_CLK	0x194
+			MX8MP_IOMUXC_NAND_WP_B__USDHC3_CMD	0x1d4
+			MX8MP_IOMUXC_NAND_DATA04__USDHC3_DATA0	0x1d4
+			MX8MP_IOMUXC_NAND_DATA05__USDHC3_DATA1	0x1d4
+			MX8MP_IOMUXC_NAND_DATA06__USDHC3_DATA2	0x1d4
+			MX8MP_IOMUXC_NAND_DATA07__USDHC3_DATA3	0x1d4
+			MX8MP_IOMUXC_NAND_RE_B__USDHC3_DATA4	0x1d4
+			MX8MP_IOMUXC_NAND_CE2_B__USDHC3_DATA5	0x1d4
+			MX8MP_IOMUXC_NAND_CE3_B__USDHC3_DATA6	0x1d4
+			MX8MP_IOMUXC_NAND_CLE__USDHC3_DATA7	0x1d4
+			MX8MP_IOMUXC_NAND_CE1_B__USDHC3_STROBE	0x194
+		>;
+	};
+
+	pinctrl_usdhc3_200mhz: usdhc3-200mhzgrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_NAND_WE_B__USDHC3_CLK	0x196
+			MX8MP_IOMUXC_NAND_WP_B__USDHC3_CMD	0x1d6
+			MX8MP_IOMUXC_NAND_DATA04__USDHC3_DATA0	0x1d6
+			MX8MP_IOMUXC_NAND_DATA05__USDHC3_DATA1	0x1d6
+			MX8MP_IOMUXC_NAND_DATA06__USDHC3_DATA2	0x1d6
+			MX8MP_IOMUXC_NAND_DATA07__USDHC3_DATA3	0x1d6
+			MX8MP_IOMUXC_NAND_RE_B__USDHC3_DATA4	0x1d6
+			MX8MP_IOMUXC_NAND_CE2_B__USDHC3_DATA5	0x1d6
+			MX8MP_IOMUXC_NAND_CE3_B__USDHC3_DATA6	0x1d6
+			MX8MP_IOMUXC_NAND_CLE__USDHC3_DATA7	0x1d6
+			MX8MP_IOMUXC_NAND_CE1_B__USDHC3_STROBE	0x196
+		>;
+	};
+};