ramips: add support for ELECOM WMC-X1800GST

ELECOM WMC-X1800GST is a 2.4/5 GHz band 11ax (Wi-Fi 6) mesh router,
based on MT7621A

Specification:

- SoC             : MediaTek MT7621A
- RAM             : DDR3 512 MiB (Nanya NT5CC256M16ER-EK)
- Flash           : RAW-NAND 128 MiB (Winbond W29N01HVSINF)
- WLAN            : 2.4/5 GHz 2T2R (MediaTek MT7915D + MT7975D)
- Ethernet        : 3x 10/100/1000 Mbps
  - switch        : MediaTek MT7530 (SoC)
- LEDs/Keys (GPIO): 9x/5x
- UART            : through-hole on PCB ("J4")
  - arrangement   : 3.3V, GND, TX, RX from tri-angle marking
  - settings      : 115200n8
- Power           : 12 VDC, 1 A (Max. 11.5 W)

Flash instruction using initramfs-factory image

1. Boot WMC-X1800GST normally with "Router" mode
2. Access to "http://192.168.2.1/" and open firmware update page
   ("ファームウェア更新")
3. Select the OpenWrt initramfs-factory image and click apply ("適用")
   button
4. On initramfs image, download sysupgrade image to the device and
   perform sysupgrade with that image
5. Wait ~120 seconds to complete flashing

Notes:

- The "firmware" partition on the stock image is only 0xF00000 (15 MiB)
  and it's too small for the current OpenWrt firmware with UBI format.
  So use the unused area at the end of NAND flash for rootfs (UBI).

MAC addresses:

LAN    : 04:AB:18:xx:xx:BF (Factory, 0x3fff4 (hex))
WAN    : 04:AB:18:xx:xx:C0 (Factory, 0x3fffa (hex))
2.4 GHz: 04:AB:18:xx:xx:C1 (Factory,     0x4 (hex))
5 GHz  : 04:AB:18:xx:xx:C2

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16384
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/ramips/dts/mt7621_elecom_wmc-x1800gst.dts

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621_elecom_wxc-x1800gsx.dtsi"
+
+/ {
+	compatible = "elecom,wmc-x1800gst", "mediatek,mt7621-soc";
+	model = "ELECOM WMC-X1800GST";
+
+	aliases {
+		label-mac-device = &gmac1;
+	};
+};
+
+&keys {
+	switch-ap {
+		label = "ap";
+		gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+		linux,code = <BTN_0>;
+		linux,input-type = <EV_SW>;
+	};
+
+	switch-router {
+		label = "router";
+		gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		linux,code = <BTN_1>;
+		linux,input-type = <EV_SW>;
+	};
+
+	switch-extender {
+		label = "extender";
+		gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		linux,code = <BTN_2>;
+		linux,input-type = <EV_SW>;
+	};
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy0>;
+
+	nvmem-cells = <&macaddr_factory_3fffa>;
+	nvmem-cell-names = "mac-address";
+};
+
+&ethphy0 {
+	/delete-property/ interrupts;
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "uart3", "uart2", "jtag", "wdt";
+		function = "gpio";
+	};
+};
+
+&wifi {
+	band@0 {
+		reg = <0>;
+		nvmem-cells = <&macaddr_factory_4 0>;
+		nvmem-cell-names = "mac-address";
+	};
+
+	band@1 {
+		reg = <1>;
+		nvmem-cells = <&macaddr_factory_4 1>;
+		nvmem-cell-names = "mac-address";
+	};
+};

target/linux/ramips/dts/mt7621_elecom_wxc-x1800gsx.dtsi

@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	aliases {
+		led-boot = &led_power_green;
+		led-failsafe = &led_power_red;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_green;
+	};
+
+	chosen {
+		bootargs-override = "console=ttyS0,115200n8";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-0 {
+			gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_WLAN_5GHZ;
+		};
+
+		led-1 {
+			gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_WLAN_5GHZ;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		led_power_green: led-2 {
+			gpios = <&gpio 7 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_POWER;
+		};
+
+		led-3 {
+			gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_POWER;
+		};
+
+		led-4 {
+			gpios = <&gpio 9 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WLAN_5GHZ;
+		};
+
+		led-5 {
+			gpios = <&gpio 10 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_WLAN_2GHZ;
+		};
+
+		led-6 {
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_WLAN_2GHZ;
+		};
+
+		led-7 {
+			gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_WLAN_2GHZ;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led_power_red: led-8 {
+			gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_POWER;
+		};
+	};
+
+	keys: keys {
+		compatible = "gpio-keys";
+
+		button-reset {
+			label = "reset";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		button-wps {
+			label = "wps";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_factory_3fff4>;
+	nvmem-cell-names = "mac-address";
+};
+
+&nand {
+	status = "okay";
+	pinctrl-0 = <&nand_pins>;
+	pinctrl-names = "default";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "u-boot-env";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+
+			nvmem-layout {
+				compatible = "fixed-layout";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				eeprom_factory_0: eeprom@0 {
+					reg = <0x0 0xe00>;
+				};
+
+				precal_factory_e10: precal@e10 {
+					reg = <0xe10 0x19c10>;
+				};
+
+				macaddr_factory_4: mac-address@4 {
+					compatible = "mac-base";
+					reg = <0x4 0x6>;
+					#nvmem-cell-cells = <1>;
+				};
+
+				macaddr_factory_3fff4: mac-address@3fff4 {
+					reg = <0x3fff4 0x6>;
+				};
+
+				macaddr_factory_3fffa: mac-address@3fffa {
+					reg = <0x3fffa 0x6>;
+				};
+			};
+		};
+
+		/* stock: "firmware" */
+		partition@180000 {
+			reg = <0x180000 0xf00000>;
+			label = "kernel";
+		};
+
+		partition@1080000 {
+			label = "user_data";
+			reg = <0x1080000 0x500000>;
+			read-only;
+		};
+
+		partition@1580000 {
+			label = "tm_pattern";
+			reg = <0x1580000 0x500000>;
+			read-only;
+		};
+
+		partition@1a80000 {
+			label = "tm_key";
+			reg = <0x1a80000 0x100000>;
+			read-only;
+		};
+
+		/* stock: (unused) */
+		partition@1b80000 {
+			label = "ubi";
+			reg = <0x1b80000 0x6480000>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi: wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&eeprom_factory_0>, <&precal_factory_e10>;
+		nvmem-cell-names = "eeprom", "precal";
+		mediatek,disable-radar-background;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+};
+
+&switch0 {
+	ports {
+		port@1 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan1";
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "uart3", "uart2", "jtag", "wdt";
+		function = "gpio";
+	};
+};
+
+&uartlite {
+	pinctrl-0 = <&uart1_pins>;
+	pinctrl-names = "default";
+};
+
+&xhci {
+	status = "disabled";
+};

target/linux/ramips/image/mt7621.mk

@@ -1164,6 +1164,24 @@ define Device/elecom_wmc-s1267gs2
 endef
 TARGET_DEVICES += elecom_wmc-s1267gs2
 
+define Device/elecom_wmc-x1800gst
+  $(Device/nand)
+  DEVICE_VENDOR := ELECOM
+  DEVICE_MODEL := WMC-X1800GST
+  KERNEL_SIZE := 15360k
+  KERNEL_LOADADDR := 0x82000000
+  KERNEL := kernel-bin | relocate-kernel $(loadaddr-y) | lzma | \
+	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
+ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
+  ARTIFACTS := initramfs-factory.bin
+  ARTIFACT/initramfs-factory.bin := append-image-stage initramfs-kernel.bin | \
+	check-size $$$$(KERNEL_SIZE) | elecom-wrc-gs-factory WMC-2LX 0.00 -N | \
+	append-string MT7621_ELECOM_WMC-2LX
+endif
+  DEVICE_PACKAGES := kmod-mt7915-firmware -uboot-envtools
+endef
+TARGET_DEVICES += elecom_wmc-x1800gst
+
 define Device/elecom_wrc-1167ghbk2-s
   $(Device/dsa-migration)
   IMAGE_SIZE := 15488k

target/linux/ramips/mt7621/base-files/etc/board.d/02_network

@@ -78,6 +78,7 @@ ramips_setup_interfaces()
 	asiarf,ap7621-nv1|\
 	beeline,smartbox-flash|\
 	beeline,smartbox-giga|\
+	elecom,wmc-x1800gst|\
 	elecom,wrc-x1800gs|\
 	glinet,gl-mt1300|\
 	iodata,wn-deax1800gr|\

target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh

@@ -90,6 +90,7 @@ platform_do_upgrade() {
 	dlink,dir-3040-a1|\
 	dlink,dir-3060-a1|\
 	dlink,dir-853-a3|\
+	elecom,wmc-x1800gst|\
 	etisalat,s3|\
 	h3c,tx1800-plus|\
 	h3c,tx1801-plus|\