ramips: add support for TP-Link MR600 V2(EU)

MR600 V2(EU) is an LTE router that also supports 4G+ band aggregation
etc. and can reportedly achieve higher bandwidth with it.

- Specifications:

* SoC: Mediatek MT7621DAT 880MHz
* RAM: 128MB DDR3
* Flash: 16MB SPI NOR flash (GD25Q128C)
* LTE Modem: Qualcomm MDM9240
* WiFi 5GHz: Mediatek MT7613BEN
* WiFi 2.4GHz: Mediatek MT7603EN
* Ethernet: MT7530, 4x 1000Base-T.
* UART: Serial console (115200 8n1), J1(GND:3)
* Buttons: Reset, WPS.
* LED: Power, WAN, LTE, WiFi 2GHz and 5GHz, LAN, Signal1, Signal2,
  Signal3

- MAC Addresses:

OEM firmware configuration:
54:af:97:xx:xx:7b : 2.4G
54:af:97:xx:xx:7a : 5G
54:af:97:xx:xx:7c : LTE
54:af:97:xx:xx:7b : LAN (label)
54:af:97:xx:xx:7c : WAN

- Installation:

1. Download the OpenWrt initramfs-image.

Place it into a TFTP server root directory and rename it to openwrt.img
Configure the TFTP server to listen at 192.168.0.5/24.

3. Connect to the serial console.

Attach power and interrupt the boot procedure when prompted (type `tpl`).

Credentials are admin / 1234

4. Configure U-Boot for booting OpenWrt from ram

 $ tftpboot
 $ bootm

5. Transfer the OpenWrt sysupgrade image to the device.

- LTE:

In order to setup the wwan0 interface:
1. Add a `qmi` proto interface under `/etc/config/network`, e.g.:
```
config interface 'wwan0'
        option device '/dev/cdc-wdm0'
        option proto 'qmi'
        option pincode 'XXXX'
        option apn 'your_isp_apn'
```

2. Add `wwan0` interface to the `wan` firewall zone
3. `/etc/init.d/network restart`

Signed-off-by: Linos Giannopoulos <linosgian00@gmail.com>

1 files changed, 207 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_tplink_mr600-v2-eu.dts b/target/linux/ramips/dts/mt7621_tplink_mr600-v2-eu.dts
new file mode 100644
index 00000000000..b7475ec15ba
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_tplink_mr600-v2-eu.dts
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "tplink,mr600-v2-eu", "mediatek,mt7621-soc";
+	model = "TP-Link MR600 v2 (EU)";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+		label-mac-device = &gmac0;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		wlan {
+			label = "wlan";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WLAN>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "white:power";
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+		};
+		wlan {
+			label = "white:wlan";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+		wan {
+			label = "white:wan";
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+		};
+
+		signal1 {
+			label = "white:signal1";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		signal2 {
+			label = "white:signal2";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		signal3 {
+			label = "white:signal3";
+			gpios = <&gpio 10 GPIO_ACTIVE_LOW>;
+		};
+
+		4g {
+			label = "white:4g";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+		lan {
+			label = "white:lan";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <80000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "uboot";
+				reg = <0x00000 0x20000>;
+				read-only;
+			};
+
+			partition@20000 {
+				compatible = "openwrt,uimage";
+				openwrt,offset = <512>; /* account for the 512-byte long header */
+				label = "firmware";
+				reg = <0x20000 0xfa0000>;
+			};
+
+			romfile: partition@fc0000 {
+				label = "romfile";
+				reg = <0xfc0000 0x10000>;
+				read-only;
+			};
+
+			partition@fd0000 {
+				label = "config";
+				reg = <0xfd0000 0x10000>;
+				read-only;
+			};
+
+			radio: partition@fe0000 {
+				label = "radio";
+				reg = <0xfe0000 0x10000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+
+&pcie0 {
+	mt76@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		nvmem-cells = <&macaddr_romfile_f100>;
+		nvmem-cell-names = "mac-address";
+		mediatek,mtd-eeprom = <&radio 0x0>;
+		mtd-mac-address = <&romfile 0xf100>;
+		ieee80211-freq-limit = <2400000 2500000>;
+	};
+};
+
+&pcie1 {
+	mt76@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&radio 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+		nvmem-cells = <&macaddr_romfile_f100>;
+		nvmem-cell-names = "mac-address";
+		mac-address-increment = <(-1)>;
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_romfile_f100>;
+	nvmem-cell-names = "mac-address";
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy4>;
+
+	nvmem-cells = <&macaddr_romfile_f100>;
+	nvmem-cell-names = "mac-address";
+};
+
+&mdio {
+	ethphy4: ethernet-phy@4 {
+		reg = <4>;
+	};
+};
+
+
+&switch0 {
+	ports {
+		port@1 {
+			status = "okay";
+			label = "lan1";
+		};
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+		port@3 {
+			status = "okay";
+			label = "lan3";
+		};
+	};
+};
+
+&romfile {
+	compatible = "nvmem-cells";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	macaddr_romfile_f100: romfile@f100 {
+		reg = <0xf100 0x6>;
+	};
+};