ramips: add support for TP-Link RE350

The TP-Link RE350 is a wall-wart AC1200 range extender/access point with
a single gigabit ethernet port and two non-detachable antennas, based on
the MT7621A SoC with MT7603E and MT7612E radios.

Firmware wise it is very similar to the QCA based RE450.

SoC: MediaTek MT7621A (880MHz)
Flash: 8MiB (Winbond W25Q64)
RAM:   64MiB (DDR2)
Ethernet: 1x 1Gbit
Wireless: 2T2R 2.4Ghz (MT7603E) and 5GHz (MT7612E)
LEDs: Power, 2.4G, 5G (blue), WPS (red and blue), ethernet link/act
(green)
Buttons: On/off, LED, reset, WPS

Serial header at J1, 57600 8n1:
Pin 1 TX
Pin 2 RX
Pin 3 GND
Pin 4 3.3V

Factory image can be uploaded directly through the stock UI.

Signed-off-by: Alex Maclean <monkeh@monkeh.net>

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

@@ -308,6 +308,12 @@ r6220)
 	set_wifi_led "$board:green:wifi"
 	set_usb_led "$board:green:usb"
 	;;
+re350-v1)
+	ucidef_set_led_netdev "wifi2g" "Wifi 2.4G" "$board:blue:wifi2G" "wlan0"
+	ucidef_set_led_netdev "wifi5g" "Wifi 5G" "$board:blue:wifi5G" "wlan1"
+	ucidef_set_led_netdev "eth_act" "LAN act" "$board:green:eth_act" "eth0" "tx rx"
+	ucidef_set_led_switch "eth_link" "LAN link" "$board:green:eth_link" "switch0" "0x01"
+	;;
 re6500)
 	ucidef_set_led_default "power" "power" "$board:white:power" "1"
 	ucidef_set_led_default "wifi" "wifi" "$board:orange:wifi" "1"

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

@@ -270,6 +270,10 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 		"1:lan:2" "2:lan:1" "4:wan" "6@eth0"
 		;;
+	re350-v1)
+		ucidef_add_switch "switch0" \
+			"0:lan" "6@eth0"
+		;;
 	re6500)
 		ucidef_add_switch "switch0" \
 			"0:lan:1" "1:lan:2" "2:lan:3" "3:lan:4" "6@eth0"

target/linux/ramips/base-files/etc/diag.sh

@@ -119,6 +119,7 @@ get_status_led() {
 	dap-1350|\
 	na930|\
 	pbr-m1|\
+	re350-v1|\
 	rt-ac51u|\
 	rt-n13u|\
 	rt-n14u|\