ramips: add support for TOTOLINK X5000R

Specifications:
- SoC: MT7621AT
- RAM: 256MB
- Flash: 16MB (EN25QH128A)
- Ethernet: 5xGbE
- WiFi: MT7915 2x2 2.4G 573.5Mbps + 2x2 5G 1201Mbps

Known issue:
MT7915 DBDC variant isn't supported yet.

Flash instruction:
Upload the sysupgrade firmware to the firmware upgrade page in
vendor fw.

Other info:
MT7915 seems to have two PCIEs connected to MT7621. Card detected on
PCIE0 has an ID of 14c3:7916 and the other one on PCIE1 has 14c3:7915.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ramips/dts/mt7621_totolink_x5000r.dts

@@ -0,0 +1,139 @@
+// 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 = "totolink,x5000r", "mediatek,mt7621-soc";
+	model = "TOTOLINK X5000R";
+
+	aliases {
+		led-boot = &led_sys;
+		led-failsafe = &led_sys;
+		led-running = &led_sys;
+		led-upgrade = &led_sys;
+		label-mac-device = &gmac0;
+		serial0 = &uartlite;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_sys: sys {
+			label = "blue:sys";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+	};
+};
+
+&gmac0 {
+	mtd-mac-address = <&factory 0xe000>;
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@1 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan3";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan4";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "wan";
+			mtd-mac-address = <&factory 0xe006>;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "wdt";
+		function = "gpio";
+	};
+};

target/linux/ramips/image/mt7621.mk

@@ -1015,6 +1015,16 @@ define Device/totolink_a7000r
 endef
 TARGET_DEVICES += totolink_a7000r
 
+define Device/totolink_x5000r
+  $(Device/dsa-migration)
+  IMAGE_SIZE := 16064k
+  UIMAGE_NAME := C8343R-9999
+  DEVICE_VENDOR := TOTOLINK
+  DEVICE_MODEL := X5000R
+  DEVICE_PACKAGES := kmod-mt7915e
+endef
+TARGET_DEVICES += totolink_x5000r
+
 define Device/tplink_re350-v1
   $(Device/dsa-migration)
   $(Device/tplink-safeloader)