ramips: add support for Netgear EX6120

Specifications:
* SoC: MT7620A
* CPU: 580 MHz
* RAM: 64 MB DDR
* Flash: 8MB NOR SPI flash
* WiFi: MT7612E (5GHz) and builtin MT7620A (2.4GHz)
* LAN: 1x100M

The device is identical to the EX6130 except
for the mains socket and the hardware ID.

Installation:
The -factory images can be flashed from the
device's web interface or via nmrpflash.

Notes:
MAC addresses were set up based on the EX6130 setup.

This is based on prior work of Adam Serbinski and Mathias Buchwald.

Tested by Mathias Buchwald.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ramips/dts/mt7620a_netgear_ex3700.dts

@@ -2,7 +2,7 @@
 
 /dts-v1/;
 
-#include "mt7620a_netgear_ex3700_ex6130.dtsi"
+#include "mt7620a_netgear_ex3x00_ex61xx.dtsi"
 
 / {
 	compatible = "netgear,ex3700", "ralink,mt7620a-soc";

target/linux/ramips/dts/mt7620a_netgear_ex6120.dts

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "mt7620a_netgear_ex3x00_ex61xx.dtsi"
+
+/ {
+	compatible = "netgear,ex6120", "ralink,mt7620a-soc";
+	model = "Netgear EX6120";
+
+	aliases {
+		led-boot = &led_power_amber;
+		led-failsafe = &led_power_amber;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_green;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power_green: power_green {
+			label = "ex6120:green:power";
+			gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		led_power_amber: power_amber {
+			label = "ex6120:amber:power";
+			gpios = <&gpio2 28 GPIO_ACTIVE_LOW>;
+		};
+
+		router_green {
+			label = "ex6120:green:router";
+			gpios = <&gpio2 25 GPIO_ACTIVE_LOW>;
+		};
+
+		router_red {
+			label = "ex6120:red:router";
+			gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
+		};
+
+		device_green {
+			label = "ex6120:green:device";
+			gpios = <&gpio2 20 GPIO_ACTIVE_LOW>;
+		};
+
+		device_red {
+			label = "ex6120:red:device";
+			gpios = <&gpio2 21 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "ex6120:green:wps";
+			gpios = <&gpio2 27 GPIO_ACTIVE_LOW>;
+		};
+	};
+};

target/linux/ramips/dts/mt7620a_netgear_ex6130.dts

@@ -2,7 +2,7 @@
 
 /dts-v1/;
 
-#include "mt7620a_netgear_ex3700_ex6130.dtsi"
+#include "mt7620a_netgear_ex3x00_ex61xx.dtsi"
 
 / {
 	compatible = "netgear,ex6130", "ralink,mt7620a-soc";

target/linux/ramips/image/mt7620.mk

@@ -670,6 +670,19 @@ define Device/netgear_ex3700
 endef
 TARGET_DEVICES += netgear_ex3700
 
+define Device/netgear_ex6120
+  SOC := mt7620a
+  NETGEAR_BOARD_ID := U12H319T30_NETGEAR
+  BLOCKSIZE := 4k
+  IMAGE_SIZE := 7744k
+  IMAGES += factory.chk
+  IMAGE/factory.chk := $$(sysupgrade_bin) | check-size | netgear-chk
+  DEVICE_PACKAGES := kmod-mt76x2
+  DEVICE_VENDOR := NETGEAR
+  DEVICE_MODEL := EX6120
+endef
+TARGET_DEVICES += netgear_ex6120
+
 define Device/netgear_ex6130
   SOC := mt7620a
   NETGEAR_BOARD_ID := U12H319T50_NETGEAR

target/linux/ramips/mt7620/base-files/etc/board.d/02_network

@@ -55,6 +55,7 @@ ramips_setup_interfaces()
 	microduino,microwrt|\
 	netgear,ex2700|\
 	netgear,ex3700|\
+	netgear,ex6120|\
 	netgear,ex6130|\
 	netgear,wn3000rp-v3|\
 	planex,cs-qr10|\