ramips: Add support for Wavlink WL-WN575A3

This commit adds support for the Wavlink WL-WN575A3, a dual-band wall-plug
wireless router with the following specifications:

 - CPU: MediaTek MT7628AN 580MHz
 - Flash: 8MB
 - RAM: 64MB
 - Ethernet: 2x 10/100 Mbps (switched)
 - 2.4 GHz: 802.11b/g/n SoC, MIMO 2x2, 20 dBm
 - 5 GHz: 802.11a/n/ac MT7612E, MIMO 2x2, 20 dBm
 - Antennas: 4x external (2 per radio), non-detachable
 - LEDs: 4 programmable + LAN, WAN, POWER
 - Buttons: reset, WPS

Flashing instructions:

Factory U-boot launches a TFTP client if WPS button is pressed during power-on.
Rename the sysupgrade file and configure a TFTP as follows:

 - Client (WL-WN575A3) IP: 192.168.10.101
 - Server IP: 192.168.10.100
 - Filename: firmware.bin

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>

1 files changed, 130 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/WL-WN575A3.dts b/target/linux/ramips/dts/WL-WN575A3.dts
new file mode 100644
index 0000000000..267482407f
--- /dev/null
+++ b/target/linux/ramips/dts/WL-WN575A3.dts
@@ -0,0 +1,130 @@
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "mt7628an.dtsi"
+
+/ {
+	compatible = "wavlink,wl-wn575a3", "mediatek,mt7628an-soc";
+	model = "Wavlink WL-WN575A3";
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x4000000>;
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		wifi-high {
+			label = "wl-wn575a3:green:wifi-high";
+			gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi-med {
+			label = "wl-wn575a3:green:wifi-med";
+			gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi-low {
+			label = "wl-wn575a3:green:wifi-low";
+			gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "wl-wn575a3:green:wps";
+			gpios = <&gpio0 4 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c", "wled_an";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+	pcie-bridge {
+		mt76@0,0 {
+			reg = <0x0000 0 0 0 0>;
+			device_type = "pci";
+			mediatek,mtd-eeprom = <&factory 0x8000>;
+			mediatek,2ghz = <0>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		linux,modalias = "m25p80", "en25q64";
+		spi-max-frequency = <10000000>;
+		m25p,chunked-io = <32>;
+
+		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 0x7b0000>;
+		};
+	};
+};
+
+&wmac {
+	status = "okay";
+	ralink,mtd-eeprom = <&factory 0x4>;
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x2e>;
+	ralink,port-map = "llllw";
+};