ramips: add support for ipTIME A3004NS-dual

ipTIME A3004NS-dual is a 2.4/5GHz band router, based on Mediatek MT7621.

Specifications:
- SoC: MT7621 (880MHz)
- RAM: DDR3 256M
- Flash: SPI NOR 16MB
- WiFi:
 - 2.4GHz: MT7602E
 - 5GHz : MT7612E
- Ethernet:
 - 4x LAN
 - 1x WAN
- USB: 1 * USB3.0 port
- UART:
  - 3.3V, TX, RX, GND / 57600 8N1

Installation via web interface:
- 1. Flash Initramfs image using OEM Firmware's web GUI
- 2. Boot into OpenWrt and perform Sysupgrade with sysupgrade image.

Revert to stock firmware:
- 1. Boot into OpenWrt and perform Sysupgrade with OEM Stock Firmware image.

Signed-off-by: Yuchan Seo <hexagonwin@disroot.org>
Reviewed-by: Sungbo Eo <mans0n@gorani.run>

target/linux/ramips/dts/mt7621_iptime_a3004ns-dual.dts

@@ -0,0 +1,179 @@
+// 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>
+
+/ {
+	compatible = "iptime,a3004ns-dual", "mediatek,mt7621-soc";
+	model = "ipTIME A3004NS-dual";
+
+	aliases {
+		led-boot = &led_cpu;
+		led-failsafe = &led_cpu;
+		led-running = &led_cpu;
+		led-upgrade = &led_cpu;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_cpu: cpu {
+			label = "blue:cpu";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "blue:usb";
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&xhci_ehci_port1>;
+			linux,default-trigger = "usbport";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	 };
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			uboot: partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x20000>;
+				read-only;
+			};
+
+			partition@20000 {
+				label = "config";
+				reg = <0x20000 0x10000>;
+				read-only;
+			};
+
+			factory: partition@30000 {
+				label = "factory";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "firmware";
+				reg = <0x40000 0xfc0000>;
+				compatible = "denx,uimage";
+			};
+		};
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_uboot_1fc20>;
+	nvmem-cell-names = "mac-address";
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "wan";
+			nvmem-cells = <&macaddr_uboot_1fc40>;
+			nvmem-cell-names = "mac-address";
+		};
+
+		port@1 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan3";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "lan4";
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+
+		led {
+			led-sources = <2>;
+			led-active-low;
+		};
+	};
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+		ieee80211-freq-limit = <2400000 2500000>;
+
+		led {
+			led-sources = <2>;
+			led-active-low;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "wdt", "i2c", "uart3";
+		function = "gpio";
+	};
+};
+
+&uboot {
+	compatible = "nvmem-cells";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	macaddr_uboot_1fc20: macaddr@1fc20 {
+		reg = <0x1fc20 0x6>;
+	};
+
+	macaddr_uboot_1fc40: macaddr@1fc40 {
+		reg = <0x1fc40 0x6>;
+	};
+};

target/linux/ramips/image/mt7621.mk

@@ -736,6 +736,17 @@ define Device/iodata_wnpr2600g
 endef
 TARGET_DEVICES += iodata_wnpr2600g
 
+define Device/iptime_a3004ns-dual
+  $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
+  IMAGE_SIZE := 16128k
+  UIMAGE_NAME := a3004nd
+  DEVICE_VENDOR := ipTIME
+  DEVICE_MODEL := A3004NS-dual
+  DEVICE_PACKAGES := kmod-usb3 kmod-mt76x2 kmod-usb-ledtrig-usbport
+endef
+TARGET_DEVICES += iptime_a3004ns-dual
+
 define Device/iptime_a6ns-m
   $(Device/dsa-migration)
   IMAGE_SIZE := 16128k