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>

1 files changed, 117 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/RT-N12-PLUS.dts b/target/linux/ramips/dts/RT-N12-PLUS.dts
new file mode 100644
index 0000000000..f3e0284aed
--- /dev/null
+++ b/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";
+		};
+	};
+};