ARM: dts: mstar: Add the Wireless Tag IDO-SBC2D06-V1B-22W

The Wireless Tag IDO-SBC2D06-V1B-22W[1] is an SBC powered by SSD202D
with a dual Ethernet and a connector for a 4-inch and 7-inch display.
It embeds a System-On-Module IDO-SOM2D01[2] with an Mstar SSD202 SoC
dual-core Cortex-A7 CPU @ 1.2Ghz , 2D GPU, 128 MB DDR3 (on-chip) and
a 256MB SPI NAND flash. This commit adds basic definition for this
board.

1. http://linux-chenxing.org/infinity2/ido-sbc2d06
2. http://www.wireless-tag.com/portfolio/ido-som2d01

Signed-off-by: Romain Perier <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Daniel Palmer <[e-mail]>

Documentation/devicetree/bindings/arm/mstar/mstar.yaml

···
           - enum:
               - honestar,ssd201htv2 # Honestar SSD201_HT_V2 devkit
               - m5stack,unitv2 # M5Stack UnitV2
+              - wirelesstag,ido-som2d01 # Wireless Tag IDO-SOM2D01
+              - wirelesstag,ido-sbc2d06-v1b-22w # Wireless Tag IDO-SBC2D06-1VB-22W
           - const: mstar,infinity2m
 
       - description: infinity3 boards

arch/arm/boot/dts/Makefile

···
 dtb-$(CONFIG_ARCH_MILBEAUT) += milbeaut-m10v-evb.dtb
 dtb-$(CONFIG_ARCH_MSTARV7) += \
 	mstar-infinity-msc313-breadbee_crust.dtb \
+	mstar-infinity2m-ssd202d-wirelesstag-ido-sbc2d06-v1b-22w.dtb \
 	mstar-infinity2m-ssd202d-ssd201htv2.dtb \
 	mstar-infinity2m-ssd202d-unitv2.dtb \
 	mstar-infinity3-msc313e-breadbee.dtb \

arch/arm/boot/dts/mstar-infinity2m-ssd201-som2d01.dtsi

···
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (c) 2021 thingy.jp.
+ * Author: Daniel Palmer <[e-mail]>
+ * Author: Romain Perier <[e-mail]>
+ */
+
+/ {
+	reg_vcc_dram: regulator-vcc-dram {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_dram";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+	};
+};
+
+&pm_uart {
+	status = "okay";
+};

arch/arm/boot/dts/mstar-infinity2m-ssd202d-wirelesstag-ido-sbc2d06-v1b-22w.dts

···
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (c) 2021 thingy.jp.
+ * Author: Daniel Palmer <[e-mail]>
+ * Author: Romain Perier <[e-mail]>
+ */
+
+/dts-v1/;
+#include "mstar-infinity2m-ssd202d-wirelesstag-ido-som2d01.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "Wireless Tag IDO-SBC2D06-1VB-22W";
+	compatible = "wirelesstag,ido-sbc2d06-v1b-22w", "mstar,infinity2m";
+
+	leds {
+		compatible = "gpio-leds";
+		sys_led {
+			gpios = <&gpio SSD20XD_GPIO_GPIO85 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "heartbeat";
+		};
+	};
+};

arch/arm/boot/dts/mstar-infinity2m-ssd202d-wirelesstag-ido-som2d01.dtsi

···
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (c) 2021 thingy.jp.
+ * Author: Daniel Palmer <[e-mail]>
+ * Author: Romain Perier <[e-mail]>
+ */
+
+/dts-v1/;
+#include "mstar-infinity2m-ssd202d.dtsi"
+#include "mstar-infinity2m-ssd201-som2d01.dtsi"
+
+/ {
+	model = "Wireless Tag IDO-SOM2D01 (SSD202D)";
+	compatible = "wirelesstag,ido-som2d01", "mstar,infinity2m";
+
+	aliases {
+		serial0 = &pm_uart;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&reg_vcc_dram {
+	regulator-min-microvolt = <1500000>;
+	regulator-max-microvolt = <1500000>;
+};