ramips: add support for WAVLINK WL-WN577A2

This commit adds support for the Wavlink WL-WN577A2 (black case) dual-band
wall-plug wireless router. In Germany this device is sold under the brand
name Maginon WL-755 (white case):

Device specifications:

- CPU: MediaTek MT7628AN (580MHz)
- Flash: 8MB
- RAM: 64MB
- Bootloader: U-Boot
- Ethernet: 2x 10/100 Mbps (Ralink RT3050)
- 2.4 GHz: 802.11b/g/n SoC
- 5 GHz: 802.11a/n/ac MT7610E
- Antennas: internal
- 4 green LEDs: 1 programmable (WPS) + LAN, WAN, POWER
- Buttons: Reset, WPS
- Small sliding power switch

Flashing instructions (U-boot):

- Configure a TFTP server on your PC/Laptop and set its IP
  to 192.168.10.100

- Rename the OpenWrt image to firmware.bin and place it in the
  root folder of the TFTP server

- Power off (using the small sliding power switch on the left
  side) the device and connect an ethernet cable from its LAN
  or WAN port to your PC/Laptop

- Press the WPS button (and keep it pressed)

- Power on the device (using the small power switch)

- After a few seconds, when the WAN/LAN LED stops blinking
  very fast, release the WPS button

- Flashing OpenWrt takes less than a minute, system will
  reboot automatically

- After reboot the WPS LED will indicate the current OpenWrt
  running status

Signed-off-by: Lars Wessels <software@bytebox.org>
[removed unused labels - fix whitespace errors - wrap commit message]
Signed-off-by: David Bauer <mail@david-bauer.net>

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7628an_wavlink_wl-wn577a2.dts b/target/linux/ramips/dts/mt7628an_wavlink_wl-wn577a2.dts
new file mode 100644
index 0000000000..41dfec3275
--- /dev/null
+++ b/target/linux/ramips/dts/mt7628an_wavlink_wl-wn577a2.dts
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "mt7628an.dtsi"
+
+/ {
+	compatible = "wavlink,wl-wn577a2", "maginon,wlr-755", "mediatek,mt7628an-soc";
+	model = "WAVLINK WL-WN577A2";
+
+	aliases {
+		led-boot = &led_wps;
+		led-failsafe = &led_wps;
+		led-running = &led_wps;
+		led-upgrade = &led_wps;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 43 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 38 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		lan {
+			label = "wl-wn577a2:green:lan";
+			gpios = <&gpio 40 GPIO_ACTIVE_LOW>;
+		};
+
+		wan {
+			label = "wl-wn577a2:green:wan";
+			gpios = <&gpio 39 GPIO_ACTIVE_LOW>;
+		};
+
+		led_wps: wps {
+			label = "wl-wn577a2:green:wps";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "wdt", "p0led_an", "p3led_an", "p4led_an";
+		function = "gpio";
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	mt76@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			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 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0x7b0000>;
+			};
+		};
+	};
+};
+
+&wmac {
+	status = "okay";
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x28>;
+};
+
+&esw {
+	mediatek,portmap = <0x2f>;
+};
+
+&usbphy {
+	status = "disabled";
+};
+
+&ehci {
+	status = "disabled";
+};
+
+&ohci {
+	status = "disabled";
+};