imx: Add support for i.MX28 based XEA board

This patch introduces support for i.MX28 based XEA board.

This board supports DM/DTS in U-Boot proper as well as DM aware drivers
in SPL (u-boot.sb) by using OF_PLATDATA.
More detailed information regarding usage of it can be found in
./board/liebherr/xea/README file.

U-Boot SPL 2019.10-rc1-00233-g6aa549f05c (Aug 12 2019 - 09:23:36 +0200)
Trying to boot from MMC1
MMC0: Command 8 timeout (status 0xf0344020)
mmc_load_image_raw_sector: mmc block read error

U-Boot 2019.10-rc1-00233-g6aa549f05c (Aug 12 2019 - 09:23:36 +0200)

CPU:   Freescale i.MX28 rev1.2 at 454 MHz
BOOT:  SSP SPI #3, master, 3V3 NOR
Model: Liebherr (LWE) XEA i.MX28 Board
DRAM:  128 MiB
MMC:   MXS MMC: 0
Loading Environment from SPI Flash... SF: Detected n25q128a13 with page size 256 Bytes, erase size 64 KiB, total 16 MiB
OK
In:    serial
Out:   serial
Err:   serial
Net:
Warning: ethernet@800f0000 (eth0) using random MAC address - ce:e1:9e:46:f3:a2
eth0: ethernet@800f0000
Hit any key to stop autoboot:  0

Signed-off-by: Lukasz Majewski <lukma@denx.de>

arch/arm/dts/Makefile

@@ -570,6 +570,9 @@ dtb-$(CONFIG_VF610) += vf500-colibri.dtb \
 	vf610-pcm052.dtb \
 	vf610-bk4r1.dtb
 
+dtb-$(CONFIG_MX28) += \
+	imx28-xea.dtb
+
 dtb-$(CONFIG_MX53) += imx53-cx9020.dtb \
 	imx53-kp.dtb \
 	imx53-m53menlo.dtb

arch/arm/dts/imx28-xea-u-boot.dtsi

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019
+ * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
+ *
+ * SPDX-License-Identifier:     GPL-2.0+ or X11
+ */
+
+/*
+ * The minimal augmentation DTS U-Boot file to allow eMMC driver
+ * configuration in SPL for falcon boot.
+ */
+#include "imx28-u-boot.dtsi"
+/ {
+	apb@80000000 {
+		u-boot,dm-spl;
+
+		apbh@80000000 {
+			u-boot,dm-spl;
+		};
+
+		apbx@80040000 {
+			u-boot,dm-spl;
+		};
+	};
+};
+
+&clks {
+	u-boot,dm-spl;
+};
+
+&gpio0 {
+	u-boot,dm-spl;
+};
+
+&pinctrl {
+	u-boot,dm-spl;
+};
+
+&ssp0 {
+	u-boot,dm-spl;
+};
+
+&ssp3 {
+	u-boot,dm-spl;
+};

arch/arm/dts/imx28-xea.dts

@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019
+ * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
+ *
+ * SPDX-License-Identifier:     GPL-2.0+ or X11
+ *
+ */
+
+/dts-v1/;
+
+#include "imx28.dtsi"
+
+/ {
+	model = "Liebherr (LWE) XEA i.MX28 Board";
+	compatible = "lwe,xea", "fsl,imx28";
+
+	aliases {
+		spi3 = &ssp3;
+	};
+
+	memory@40000000 {
+		device_type = "memory";
+		reg = <0x40000000 0x10000000>;
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "3P3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	reg_fec_3v3: regulator-fec-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "fec-3v3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&mac0 {
+	phy-mode = "rmii";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mac0_pins_a>;
+	phy-supply = <&reg_fec_3v3>;
+	phy-reset-gpios = <&gpio2 13 GPIO_ACTIVE_LOW>;
+	phy-reset-duration = <1>;
+	phy-reset-post-delay = <1>;
+	status = "okay";
+
+	fixed-link {
+	      speed = <100>;
+	      full-duplex;
+	};
+};
+
+&ssp0 {
+	compatible = "fsl,imx28-mmc";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc0_8bit_pins_a>;
+	bus-width = <8>;
+	vmmc-supply = <&reg_3p3v>;
+	non-removable;
+	status = "okay";
+};
+
+&ssp3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "fsl,imx28-spi";
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi3_pins_b>;
+	status = "okay";
+	spi-max-frequency = <40000000>;
+	num-cs = <2>;
+
+	flash0: s25fl256s@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		spi-max-frequency = <40000000>;
+		reg = <0>;
+
+		partition@0 {
+			label = "SPL (spi)";
+			reg = <0x0 0x10000>;
+			read-only;
+		};
+		partition@1 {
+			label = "u-boot (spi)";
+			reg = <0x10000 0x70000>;
+			read-only;
+		};
+		partition@2 {
+			label = "uboot-env (spi)";
+			reg = <0x80000 0x20000>;
+		};
+		partition@3 {
+			label = "kernel (spi)";
+			reg = <0x100000 0x400000>;
+		};
+		partition@4 {
+			label = "swupdate (spi)";
+			reg = <0x50000 0x800000>;
+		};
+	};
+};

arch/arm/mach-imx/mxs/Kconfig

@@ -60,6 +60,9 @@ config TARGET_SC_SPS_1
 config TARGET_TS4600
 	bool "Support TS4600"
 
+config TARGET_XEA
+	bool "Support XEA"
+
 endchoice
 
 config SYS_SOC
@@ -67,6 +70,7 @@ config SYS_SOC
 
 source "board/bluegiga/apx4devkit/Kconfig"
 source "board/freescale/mx28evk/Kconfig"
+source "board/liebherr/xea/Kconfig"
 source "board/ppcag/bg0900/Kconfig"
 source "board/schulercontrol/sc_sps_1/Kconfig"
 source "board/technologic/ts4600/Kconfig"