ARM: dts: imx6ul-kontron-n6310: Add Kontron i.MX6UL N6310 SoM and boards

Add support for i.MX6UL modules from Kontron Electronics GmbH (before
acquisition: Exceet Electronics) and evalkit boards based on it:

1. N6310 SOM: i.MX6 UL System-on-Module, a 25x25 mm solderable module
   (LGA pads and pin castellations) with 256 MB RAM, 1 MB NOR-Flash,
   256 MB NAND and other interfaces,
2. N6310 S: evalkit, w/wo eMMC, without display,
3. N6310 S 43: evalkit with 4.3" display,

The work is based on Exceet/Kontron source code (GPLv2) with numerous
changes:
1. Reorganize files,
2. Rename Exceet -> Kontron,
3. Rename models/compatibles to match newest Kontron product naming,
4. Fix coding style errors and adjust to device tree coding guidelines,
5. Fix DTC warnings,
6. Extend compatibles so eval boards inherit the SoM compatible,
7. Use defines instead of GPIO and interrupt flag values,
8. Use proper vendor compatible for Macronix SPI NOR,
9. Replace deprecated bindings with proper ones,
10. Sort nodes alphabetically,
11. Remove Admatec display nodes (not yet supported).

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/Makefile

@@ -569,6 +569,8 @@ dtb-$(CONFIG_SOC_IMX6UL) += \
 	imx6ul-geam.dtb \
 	imx6ul-isiot-emmc.dtb \
 	imx6ul-isiot-nand.dtb \
+	imx6ul-kontron-n6310-s.dtb \
+	imx6ul-kontron-n6310-s-43.dtb \
 	imx6ul-liteboard.dtb \
 	imx6ul-opos6uldev.dtb \
 	imx6ul-pico-hobbit.dtb \

arch/arm/boot/dts/imx6ul-kontron-n6310-s-43.dts

@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 exceet electronics GmbH
+ * Copyright (C) 2018 Kontron Electronics GmbH
+ * Copyright (c) 2019 Krzysztof Kozlowski <krzk@kernel.org>
+ */
+
+#include "imx6ul-kontron-n6310-s.dts"
+
+/ {
+	model = "Kontron N6310 S 43";
+	compatible = "kontron,imx6ul-n6310-s-43", "kontron,imx6ul-n6310-s",
+		     "kontron,imx6ul-n6310-som", "fsl,imx6ul";
+
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm7 0 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+		status = "okay";
+	};
+};
+
+&i2c4 {
+	touchscreen@5d {
+		compatible = "goodix,gt928";
+		reg = <0x5d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_cap_touch>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <6 IRQ_TYPE_LEVEL_LOW>;
+		reset-gpios = <&gpio5 8 GPIO_ACTIVE_HIGH>;
+		irq-gpios = <&gpio5 6 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&lcdif {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lcdif_dat &pinctrl_lcdif_ctrl>;
+	/* Leave status disabled because of missing display panel node */
+};
+
+&pwm7 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm7>;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_cap_touch: captouchgrp {
+		fsl,pins = <
+			MX6UL_PAD_SNVS_TAMPER6__GPIO5_IO06	0x1b0b0 /* Touch Interrupt */
+			MX6UL_PAD_SNVS_TAMPER7__GPIO5_IO07	0x1b0b0 /* Touch Reset */
+			MX6UL_PAD_SNVS_TAMPER8__GPIO5_IO08	0x1b0b0 /* Touch Wake */
+		>;
+	};
+
+	pinctrl_lcdif_ctrl: lcdifctrlgrp {
+		fsl,pins = <
+			MX6UL_PAD_LCD_CLK__LCDIF_CLK		0x79
+			MX6UL_PAD_LCD_ENABLE__LCDIF_ENABLE	0x79
+			MX6UL_PAD_LCD_HSYNC__LCDIF_HSYNC	0x79
+			MX6UL_PAD_LCD_VSYNC__LCDIF_VSYNC	0x79
+			MX6UL_PAD_LCD_RESET__LCDIF_RESET	0x79
+		>;
+	};
+
+	pinctrl_lcdif_dat: lcdifdatgrp {
+		fsl,pins = <
+			MX6UL_PAD_LCD_DATA00__LCDIF_DATA00	0x79
+			MX6UL_PAD_LCD_DATA01__LCDIF_DATA01	0x79
+			MX6UL_PAD_LCD_DATA02__LCDIF_DATA02	0x79
+			MX6UL_PAD_LCD_DATA03__LCDIF_DATA03	0x79
+			MX6UL_PAD_LCD_DATA04__LCDIF_DATA04	0x79
+			MX6UL_PAD_LCD_DATA05__LCDIF_DATA05	0x79
+			MX6UL_PAD_LCD_DATA06__LCDIF_DATA06	0x79
+			MX6UL_PAD_LCD_DATA07__LCDIF_DATA07	0x79
+			MX6UL_PAD_LCD_DATA08__LCDIF_DATA08	0x79
+			MX6UL_PAD_LCD_DATA09__LCDIF_DATA09	0x79
+			MX6UL_PAD_LCD_DATA10__LCDIF_DATA10	0x79
+			MX6UL_PAD_LCD_DATA11__LCDIF_DATA11	0x79
+			MX6UL_PAD_LCD_DATA12__LCDIF_DATA12	0x79
+			MX6UL_PAD_LCD_DATA13__LCDIF_DATA13	0x79
+			MX6UL_PAD_LCD_DATA14__LCDIF_DATA14	0x79
+			MX6UL_PAD_LCD_DATA15__LCDIF_DATA15	0x79
+			MX6UL_PAD_LCD_DATA16__LCDIF_DATA16	0x79
+			MX6UL_PAD_LCD_DATA17__LCDIF_DATA17	0x79
+			MX6UL_PAD_LCD_DATA18__LCDIF_DATA18	0x79
+			MX6UL_PAD_LCD_DATA19__LCDIF_DATA19	0x79
+			MX6UL_PAD_LCD_DATA20__LCDIF_DATA20	0x79
+			MX6UL_PAD_LCD_DATA21__LCDIF_DATA21	0x79
+			MX6UL_PAD_LCD_DATA22__LCDIF_DATA22	0x79
+			MX6UL_PAD_LCD_DATA23__LCDIF_DATA23	0x79
+		>;
+	};
+
+	pinctrl_pwm7: pwm7grp {
+		fsl,pins = <
+			MX6UL_PAD_CSI_VSYNC__PWM7_OUT		0x110b0
+		>;
+	};
+};