ramips: add support for TP-Link TL-MR3420 v5

TP-Link TL-MR3420 v5 are simple N300 router with
5-port FE switch and non-detachable antennas.
Its very similar to TP-Link TL-WR841N V13.

Specification:

- MT7628N/N (580 MHz)
- 64 MB of RAM (DDR2)
- 8 MB of FLASH
- 2T2R 2.4 GHz
- 5x 10/100 Mbps Ethernet
- 2x external, non-detachable antennas
- USB 2.0 Port
- UART (J1) header on PCB (115200 8n1)
- 8x LED, 2x button, power input switch

Flash instruction:

The only way to flash LEDE image in mr3420v5 is to use
tftp recovery mode in U-Boot:

1. Configure PC with static IP 192.168.0.225/24 and tftp server.
2. Rename "lede-ramips-mt7628-tplink_tl-mr3420-v5-squashfs-tftp-recovery.bin"
   to "tp_recovery.bin" and place it in tftp server directory.
3. Connect PC with one of LAN ports, press the reset button, power up
   the router and keep button pressed for around 6-7 seconds, until
   device starts downloading the file.
4. Router will download file from server, write it to flash and reboot.

Signed-off-by: Henryk Heisig <hyniu@o2.pl>

1 files changed, 86 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/TL-MR3420V5.dts b/target/linux/ramips/dts/TL-MR3420V5.dts
new file mode 100644
index 0000000000..fdb09dcd6e
--- /dev/null
+++ b/target/linux/ramips/dts/TL-MR3420V5.dts
@@ -0,0 +1,86 @@
+/dts-v1/;
+
+#include "TL-WR84XN.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "tplink,tl-mr3420-v5", "mediatek,mt7628an-soc";
+	model = "TP-Link TL-MR3420 v5";
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		rfkill {
+			label = "rfkill";
+			gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RFKILL>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		lan {
+			label = "tl-mr3420-v5:green:lan";
+			gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
+		};
+
+		power {
+			label = "tl-mr3420-v5:green:power";
+			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "tl-mr3420-v5:green:usb";
+			gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
+		};
+
+		wan {
+			label = "tl-mr3420-v5:green:wan";
+			gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
+		};
+
+		wan_amber {
+			label = "tl-mr3420-v5:amber:wan";
+			gpios = <&gpio0 4 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan {
+			label = "tl-mr3420-v5:green:wlan";
+			gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "tl-mr3420-v5:green:wps";
+			gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c", "i2s", "p2led_an", "refclk", "uart1", "wdt", "wled_an";
+			ralink,function = "gpio";
+		};
+	};
+};