ramips: add support for D-Link DWR-118-A2

The DWR-118-A2 Wireless Router is based on the MT7620A SoC.

Specification:

- MediaTek MT7620A (580 Mhz)
- 128 MB of RAM
- 16 MB of FLASH
- 1x 802.11bgn radio
- 1x 802.11ac radio (MT7612EN)
- 4x 10/100 Mbps Ethernet (1 WAN and 3 LAN)
- 1x 10/100/1000 Mbps Marvell Ethernet PHY (1 LAN)
- 2x external, non-detachable antennas
- 1x USB 2.0
- UART (J1) header on PCB (57600 8n1)
- 7x LED (5x GPIO-controlled), 2x button
- JBOOT bootloader

Known issues:
- GELAN not working
- flash is very slow

The status led has been assigned to the dwr-118-a2:green:internet led.
At the end of the boot it is switched off and is available for other
operation. Work correctly also during sysupgrade operation.

Installation:
Apply factory image via http web-gui or JBOOT recovery page

How to revert to OEM firmware:
- push the reset button and turn on the power. Wait until LED start
  blinking (~10sec.)
- upload original factory image via JBOOT http (IP: 192.168.123.254)

Signed-off-by: Cezary Jackiewicz <cezary@eko.one.pl>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/DWR-118-A2.dts b/target/linux/ramips/dts/DWR-118-A2.dts
new file mode 100644
index 0000000000..f36ecb5b20
--- /dev/null
+++ b/target/linux/ramips/dts/DWR-118-A2.dts
@@ -0,0 +1,179 @@
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "dlink,dwr-118-a2", "ralink,mt7620a-soc";
+	model = "D-Link DWR-118 A2";
+
+	aliases {
+		led-status = &led_internet;
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		wps {
+			label = "wps";
+			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		wan {
+			label = "dwr-118-a2:green:wan";
+			gpios = <&gpio3 0 GPIO_ACTIVE_LOW>;
+		};
+
+		led_internet: internet {
+			label = "dwr-118-a2:green:internet";
+			gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
+		};
+
+		lan {
+			label = "dwr-118-a2:green:lan";
+			gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan2g {
+			label = "dwr-118-a2:green:wlan2g";
+			gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "dwr-118-a2:green:usb";
+			gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
+		};
+
+
+	};
+
+	gpio_export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+
+		usb {
+			gpio-export,name = "usb";
+			gpio-export,output = <1>;
+			gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>;
+	};
+    };
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&gpio3 {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "jboot";
+				reg = <0x0 0x10000>;
+				read-only;
+			};
+
+			partition@10000 {
+				label = "firmware";
+				reg = <0x10000 0xfe0000>;
+			};
+
+			config: partition@ff0000 {
+				label = "config";
+				reg = <0xff0000 0x10000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		default {
+			ralink,group = "ephy", "uartf", "spi refclk", "wled";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		ieee80211-freq-limit = <5000000 6000000>;
+		mtd-mac-address = <&config 0xe4a8>;
+		mtd-mac-address-increment = <(2)>;
+
+		led {
+			led-sources = <2>;
+			led-active-low;
+		};
+	};
+};
+
+&ethernet {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii1_pins &mdio_pins>;
+
+	port@4 {
+		status = "okay";
+		phy-handle = <&phy4>;
+		phy-mode = "rgmii";
+	};
+
+	mdio-bus {
+		status = "okay";
+
+		phy4: ethernet-phy@4 {
+			reg = <4>;
+			phy-mode = "rgmii";
+		};
+	};
+};
+
+&gsw {
+	mediatek,port4 = "gmac";
+};