ath79: migrate TP-Link TL-MR3420v2 to ath79

Specifications:
- SoC: ar9341
- RAM: 32M
- Flash: 4M
- Ethernet: 5x FE ports
- WiFi: ar9341-wmac

Flash instruction:
Upload generated factory firmware on vendor's web interface.

This changes the key assignment compared to ar71xx support of this
device, since of the two keys on the device one is used as combined
Reset/WPS and the second one as WiFi on/off button.
Despite, the reset button required GPIO_ACTIVE_HIGH to work correctly.

Signed-off-by: Lim Guo Wei <limguowei@gmail.com>
[redo commit message]
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ath79/base-files/etc/board.d/01_leds

@@ -210,6 +210,17 @@ tplink,tl-mr3020-v1|\
 tplink,tl-mr3040-v2)
 	ucidef_set_led_netdev "lan" "LAN" "tp-link:green:lan" "eth0"
 	;;
+tplink,tl-mr3420-v2|\
+tplink,tl-wr740n-v4|\
+tplink,tl-wr741nd-v4|\
+tplink,tl-wr841-v8|\
+tplink,tl-wr842n-v2)
+	ucidef_set_led_netdev "wan" "WAN" "tp-link:green:wan" "eth1"
+	ucidef_set_led_switch "lan1" "LAN1" "tp-link:green:lan1" "switch0" "0x04"
+	ucidef_set_led_switch "lan2" "LAN2" "tp-link:green:lan2" "switch0" "0x08"
+	ucidef_set_led_switch "lan3" "LAN3" "tp-link:green:lan3" "switch0" "0x10"
+	ucidef_set_led_switch "lan4" "LAN4" "tp-link:green:lan4" "switch0" "0x02"
+	;;
 tplink,tl-wr740n-v1|\
 tplink,tl-wr740n-v3|\
 tplink,tl-wr741-v1|\
@@ -222,16 +233,6 @@ tplink,tl-wr941-v4)
 	ucidef_set_led_switch "lan3" "LAN3" "tp-link:green:lan3" "switch0" "0x08"
 	ucidef_set_led_switch "lan4" "LAN4" "tp-link:green:lan4" "switch0" "0x10"
 	;;
-tplink,tl-wr740n-v4|\
-tplink,tl-wr741nd-v4|\
-tplink,tl-wr841-v8|\
-tplink,tl-wr842n-v2)
-	ucidef_set_led_netdev "wan" "WAN" "tp-link:green:wan" "eth1"
-	ucidef_set_led_switch "lan1" "LAN1" "tp-link:green:lan1" "switch0" "0x04"
-	ucidef_set_led_switch "lan2" "LAN2" "tp-link:green:lan2" "switch0" "0x08"
-	ucidef_set_led_switch "lan3" "LAN3" "tp-link:green:lan3" "switch0" "0x10"
-	ucidef_set_led_switch "lan4" "LAN4" "tp-link:green:lan4" "switch0" "0x02"
-	;;
 tplink,tl-wr940n-v3|\
 tplink,tl-wr940n-v4|\
 tplink,tl-wr941nd-v6)

target/linux/ath79/base-files/etc/board.d/02_network

@@ -248,6 +248,15 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0@eth0" "2:lan:3" "3:lan:2" "4:lan:1" "1:wan"
 		;;
+	tplink,tl-mr3420-v2|\
+	tplink,tl-wr740n-v4|\
+	tplink,tl-wr741nd-v4|\
+	tplink,tl-wr841-v8|\
+	tplink,tl-wr842n-v2)
+		ucidef_set_interface_wan "eth1"
+		ucidef_add_switch "switch0" \
+			"0@eth0" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
+		;;
 	tplink,tl-wr1043nd-v1)
 		ucidef_add_switch "switch0" \
 			"1:lan" "2:lan" "3:lan" "4:lan" "0:wan" "5@eth0"
@@ -261,14 +270,6 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"1:lan" "2:lan" "3:lan" "4:lan" "0:wan" "9@eth0"
 		;;
-	tplink,tl-wr740n-v4|\
-	tplink,tl-wr741nd-v4|\
-	tplink,tl-wr841-v8|\
-	tplink,tl-wr842n-v2)
-		ucidef_set_interface_wan "eth1"
-		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
-		;;
 	tplink,tl-wr941-v2)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" "wan"
 		;;

target/linux/ath79/dts/ar9341_tplink_tl-mr3420-v2.dts

@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar9341.dtsi"
+
+/ {
+	model = "TP-Link TL-MR3420 v2";
+	compatible = "tplink,tl-mr3420-v2", "qca,ar9341";
+
+	aliases {
+		serial0 = &uart;
+		led-boot = &system;
+		led-failsafe = &system;
+		led-running = &system;
+		led-upgrade = &system;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&jtag_disable_pins>;
+
+		reset {
+			label = "Reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+
+		rfkill {
+			label = "WiFi";
+			linux,code = <KEY_RFKILL>;
+			gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		system: power {
+			label = "tp-link:green:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wlan {
+			label = "tp-link:green:wlan";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		qss {
+			label = "tp-link:green:qss";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		wan {
+			label = "tp-link:green:wan";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+
+		lan1 {
+			label = "tp-link:green:lan1";
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+
+		lan2 {
+			label = "tp-link:green:lan2";
+			gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
+		};
+
+		lan3 {
+			label = "tp-link:green:lan3";
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+		};
+
+		lan4 {
+			label = "tp-link:green:lan4";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "tp-link:green:usb";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&hub_port>;
+			linux,default-trigger = "usbport";
+		};
+	};
+};
+
+&ref {
+	clock-frequency = <25000000>;
+};
+
+&uart {
+	status = "okay";
+};
+
+&gpio {
+	status = "okay";
+
+	usb_power {
+		gpio-hog;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "tp-link:power:usb";
+	};
+};
+
+&spi {
+	num-cs = <1>;
+
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			uboot: partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x020000>;
+				read-only;
+			};
+
+			partition@20000 {
+				compatible = "tplink,firmware";
+				label = "firmware";
+				reg = <0x020000 0x3d0000>;
+			};
+
+			art: partition@3f0000 {
+				label = "art";
+				reg = <0x3f0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy0>;
+	mtd-mac-address = <&uboot 0x1fc00>;
+	mtd-mac-address-increment = <(-1)>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&uboot 0x1fc00>;
+
+	gmac-config {
+		device = <&gmac>;
+		switch-phy-swap = <1>;
+	};
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&uboot 0x1fc00>;
+};
+
+&usb {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	hub_port: port@1 {
+		reg = <1>;
+		#trigger-source-cells = <0>;
+	};
+};
+
+&usb_phy {
+	status = "okay";
+};

target/linux/ath79/image/tiny-tp-link.mk

@@ -55,6 +55,17 @@ define Device/tplink_tl-mr3420-v1
 endef
 TARGET_DEVICES += tplink_tl-mr3420-v1
 
+define Device/tplink_tl-mr3420-v2
+  $(Device/tplink-4mlzma)
+  ATH_SOC := ar9341
+  DEVICE_MODEL := TL-MR3420
+  DEVICE_VARIANT := v2
+  TPLINK_HWID := 0x34200002
+  DEVICE_PACKAGES := kmod-usb2 kmod-usb-ledtrig-usbport
+  SUPPORTED_DEVICES += tl-mr3420-v2
+endef
+TARGET_DEVICES += tplink_tl-mr3420-v2
+
 define Device/tplink_tl-wa901nd-v2
   $(Device/tplink-4m)
   ATH_SOC := ar9132