ramips: add support for Asus RT-N11P / RT-N12+ / RT-N12E b1

This is a variant of the MT7620N-based Asus routers.

Specifications:

- MT7620N (580 MHz)
- 32 MB RAM
- 8 MB Flash
- 5x 10/100Mbps Ethernet (built-in switch)
- 2.4 GHz WLAN
- 2x external, non-detachable antennas
- UART (J2) header on PCB (115200 8n1)

Flash instructions:

1. Configure PC with static IP 192.168.1.75/24
2. Connect PC with one of LAN ports, press the reset button, power up
   the router and keep button pressed for around 6-7 seconds. All 4 LEDs will
   start to blink, which is when the router will accept firmware files via TFTP.
   No known limitations on firmware filenames, just send it with a TFTP client
   to 192.168.1.1.
3. Router will download file from server, write it to flash and reboot.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

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

@@ -340,6 +340,12 @@ rt-ac51u)
 	set_wifi_led "$board:blue:wifi"
 	set_usb_led "$board:blue:usb" "1-1"
 	;;
+rt-n12p)
+	ucidef_set_led_default "power" "power" "$board:green:power" "1"
+	ucidef_set_led_netdev "lan" "lan" "$board:green:lan" eth0.1
+	ucidef_set_led_netdev "wan" "wan" "$board:green:wan" eth0.2
+	set_wifi_led "$board:green:air"
+	;;
 rt-n14u)
 	ucidef_set_led_default "power" "power" "$board:blue:power" "1"
 	ucidef_set_led_netdev "lan" "lan" "$board:blue:lan" eth0.1

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

@@ -100,6 +100,7 @@ ramips_setup_interfaces()
 	psg1208|\
 	psg1218a|\
 	r6220|\
+	rt-n12p)
 	sap-g3200u3|\
 	sk-wb8|\
 	u7621-06-256M-16M|\

target/linux/ramips/base-files/lib/ramips.sh

@@ -460,6 +460,9 @@ ramips_board_detect() {
 	*"RT-N10+")
 		name="rt-n10-plus"
 		;;
+	*"RT-N12+")
+		name="rt-n12p"
+		;;
 	*"RT-N13U")
 		name="rt-n13u"
 		;;

target/linux/ramips/base-files/lib/upgrade/platform.sh

@@ -130,6 +130,7 @@ platform_check_image() {
 	rt-ac51u|\
 	rt-g32-b1|\
 	rt-n10-plus|\
+	rt-n12p|\
 	rt-n13u|\
 	rt-n14u|\
 	rt-n15|\

target/linux/ramips/dts/RT-N12-PLUS.dts

@@ -0,0 +1,117 @@
+/dts-v1/;
+
+#include "mt7620n.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "asus,rt-n12p", "ralink,mt7620n-soc";
+	model = "Asus RT-N12+";
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		wan {
+			label = "rt-n12p:green:wan";
+			gpios = <&gpio2 4 GPIO_ACTIVE_LOW>;
+		};
+
+		lan {
+			label = "rt-n12p:green:lan";
+			gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+		};
+
+		power {
+			label = "rt-n12p:green:power";
+			gpios = <&gpio2 3 GPIO_ACTIVE_LOW>;
+		};
+
+		air {
+			label = "rt-n12p:green:air";
+			gpios = <&gpio3 0 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&gpio3 {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+
+	m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x30000>;
+			read-only;
+		};
+
+		partition@30000 {
+			label = "u-boot-env";
+			reg = <0x30000 0x10000>;
+			read-only;
+		};
+
+		factory: partition@40000 {
+			label = "factory";
+			reg = <0x40000 0x10000>;
+			read-only;
+		};
+
+		partition@50000 {
+			label = "firmware";
+			reg = <0x50000 0xfb0000>;
+		};
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x4>;
+	mediatek,portmap = "wllll";
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		default {
+			ralink,group = "ephy", "wled", "i2c", "wdt", "pa", "spi refclk";
+			ralink,function = "gpio";
+		};
+	};
+};

target/linux/ramips/image/mt7620.mk

@@ -391,6 +391,12 @@ define Device/rp-n53
 endef
 TARGET_DEVICES += rp-n53
 
+define Device/rt-n12p
+  DTS := RT-N12-PLUS
+  DEVICE_TITLE := Asus RT-N11P/RT-N12+/RT-N12Eb1
+endef
+TARGET_DEVICES += rt-n12p
+
 define Device/rt-n14u
   DTS := RT-N14U
   DEVICE_TITLE := Asus RT-N14u