ramips: add support for TP-Link Archer AX21

This patch adds support for the TP-Link Archer AX21 v4.

Device specification
--------------------
SoC Type:	Mediatek MT7621DAT
RAM:		DDR (128MB)
Flash:		ESMT EN25QH128A (16MB)
Ethernet:	5x (4 lan, 1 wan) via embedded switch/SoC built-in
Wi-Fi:		2x2 2.4GHz via MT7975DN, 2x2 5GHz via MT7905DAN
LEDs:		Power, 2.4GHz, 5GHz, WAN, LAN, WPS
Buttons:	Reset, WPS

Installation
------------

Upload the factory image using the Web UI.

Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20932
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

3 files changed, 246 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_tplink_archer-ax21-v4.dts b/target/linux/ramips/dts/mt7621_tplink_archer-ax21-v4.dts
new file mode 100644
index 0000000000..eabb719b67
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_tplink_archer-ax21-v4.dts
@@ -0,0 +1,233 @@
+// 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>
+
+/ {
+	compatible = "tplink,archer-ax21-v4", "mediatek,mt7621-soc";
+	model = "TP-Link Archer AX21 v4";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+		label-mac-device = &gmac0;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			function = LED_FUNCTION_POWER;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan-2g {
+			function = LED_FUNCTION_WLAN_2GHZ;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		wlan-5g {
+			function = LED_FUNCTION_WLAN_5GHZ;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		wan-green {
+			function = LED_FUNCTION_WAN;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		wan-orange {
+			function = LED_FUNCTION_WAN;
+			color = <LED_COLOR_ID_ORANGE>;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		lan {
+			function = LED_FUNCTION_LAN;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			function = LED_FUNCTION_WPS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x40000>;
+				read-only;
+			};
+
+			partition@40000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x40000 0xf60000>;
+			};
+
+			partition@fa0000 {
+				label = "config";
+				reg = <0xfa0000 0x10000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					macaddr_config_8: macaddr@8 {
+						compatible = "mac-base";
+						reg = <0x8 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@fb0000 {
+				label = "tplink";
+				reg = <0xfb0000 0x40000>;
+				read-only;
+			};
+
+			partition@ff0000 {
+				label = "radio";
+				reg = <0xff0000 0x010000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_radio_0: eeprom@0 {
+						reg = <0x0 0xe00>;
+					};
+				};
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&eeprom_radio_0>;
+		nvmem-cell-names = "eeprom";
+		mediatek,disable-radar-background;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		band@0 {
+			reg = <0>;
+			nvmem-cells = <&macaddr_config_8 0>;
+			nvmem-cell-names = "mac-address";
+		};
+
+		band@1 {
+			reg = <1>;
+			nvmem-cells = <&macaddr_config_8 (-1)>;
+			nvmem-cell-names = "mac-address";
+		};
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_config_8 0>;
+	nvmem-cell-names = "mac-address";
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy4>;
+
+	nvmem-cells = <&macaddr_config_8 1>;
+	nvmem-cell-names = "mac-address";
+};
+
+&ethphy4 {
+	/delete-property/ interrupts;
+};
+
+&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";
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "uart3", "jtag", "wdt";
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index bb4ffa8adb..8ddfed95f5 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2859,6 +2859,18 @@ define Device/tozed_zlt-s12-pro
 endef
 TARGET_DEVICES += tozed_zlt-s12-pro
 
+define Device/tplink_archer-ax21-v4
+  $(Device/dsa-migration)
+  $(Device/tplink-safeloader)
+  DEVICE_MODEL := Archer AX21
+  DEVICE_VARIANT := v4
+  DEVICE_PACKAGES := kmod-mt7915-firmware -uboot-envtools
+  TPLINK_BOARD_ID := ARCHER-AX21-V4
+  KERNEL := $(KERNEL_DTB) | uImage lzma
+  IMAGE_SIZE := 15744k
+endef
+TARGET_DEVICES += tplink_archer-ax21-v4
+
 define Device/tplink_archer-ax23-v1
   $(Device/dsa-migration)
   $(Device/tplink-safeloader)
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds b/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
index d2f9d04ab4..989fe17af8 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
@@ -208,6 +208,7 @@ snr,snr-cpe-me1)
 	ucidef_set_led_usbport "usb" "USB" "green:usb" "usb1-port1" "usb2-port1"
 	;;
 tplink,archer-a6-v3|\
+tplink,archer-ax21-v4|\
 tplink,archer-ax23-v1|\
 tplink,archer-c6-v3|\
 tplink,archer-c6u-v1|\