ramips: add support for JCG Q20

JCG Q20 is an AX 1800M router.

Hardware specs:
  SoC: MediaTek MT7621AT
  Flash: Winbond W29N01HV 128 MiB
  RAM: Winbond W632GU6NB-11 256 MiB
  WiFi: MT7915 2.4/5 GHz 2T2R
  Ethernet: 10/100/1000 Mbps x3
  LED: Status (red / blue)
  Button: Reset, WPS
  Power: DC 12V,1A

Flash instructions:
  Upload factory.bin in stock firmware's upgrade page,
  do not preserve settings.

MAC addresses map:
  0x00004 *:3e wlan2g/wlan5g
  0x3fff4 *:3c lan/label
  0x3fffa *:3c wan

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
(cherry picked from commit 57cb387cfeee2a07902a2f1383ca471ef47265f3)

1 files changed, 175 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_jcg_q20.dts b/target/linux/ramips/dts/mt7621_jcg_q20.dts
new file mode 100644
index 0000000000..f0e829393c
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_jcg_q20.dts
@@ -0,0 +1,175 @@
+// 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 = "jcg,q20", "mediatek,mt7621-soc";
+	model = "JCG Q20";
+
+	aliases {
+		led-boot = &led_status_red;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_blue;
+		led-upgrade = &led_status_blue;
+		label-mac-device = &gmac0;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_red: status_red {
+			label = "red:status";
+			gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_status_blue: status_blue {
+			label = "blue:status";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	ubi-concat {
+		compatible = "mtd-concat";
+		devices = <&ubiconcat0 &ubiconcat1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "ubi";
+				reg = <0x0 0x5900000>;
+			};
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "Bootloader";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "Config";
+			reg = <0x80000 0x80000>;
+		};
+
+		factory: partition@100000 {
+			label = "Factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "kernel";
+			reg = <0x180000 0x400000>;
+		};
+
+		ubiconcat0: partition@580000 {
+			label = "ubiconcat0";
+			reg = <0x580000 0x1c00000>;
+		};
+
+		partition@2180000 {
+			label = "firmware_backup";
+			reg = <0x2180000 0x2000000>;
+		};
+
+		partition@4180000 {
+			label = "rootfs_data_back";
+			reg = <0x4180000 0x80000>;
+			read-only;
+		};
+
+		partition@4200000 {
+			label = "nvram_config";
+			reg = <0x4200000 0x80000>;
+			read-only;
+		};
+
+		ubiconcat1: partition@4280000 {
+			label = "ubiconcat1";
+			reg = <0x4280000 0x3d00000>;
+		};
+
+		/*
+		 * last 512 KiB are for the bad block table
+		 */
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0>;
+	};
+};
+
+&gmac0 {
+	mtd-mac-address = <&factory 0x3fff4>;
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "wan";
+			mtd-mac-address = <&factory 0x3fffa>;
+		};
+
+		port@1 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "lan2";
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "jtag", "wdt";
+		function = "gpio";
+	};
+};