mediatek: add support for Netgear EX6250v2 series

Netgear EX6250v2, EX6400v3, EX6410v2, EX6470 are wall-plug 802.11ac
(Wi-Fi 5) extenders. Like other MT7629 devices, Wi-Fi does not work
currently as there is no driver.

Related: https://github.com/openwrt/openwrt/pull/5084

For future reference, 2.4GHz MAC = LAN+1, 5GHz MAC = LAN+2.

Specifications:
* MT7629, 256 MiB RAM, 16 MiB SPI NOR
* MT7761N (2.4GHz) / MT7762N (5GHz) - no driver
* Ethernet: 1 port 10/100/1000
* UART: 115200 baud (labeled on board)

Installation:
* Flash the factory image through the stock web interface, or TFTP to
  the bootloader. NMRP can be used to TFTP without opening the case.
* After installation, perform a factory reset. Wait for the device to
  boot, then hold the reset button for 10 seconds. This is needed
  because sysupgrade in the stock firmware will attempt to preserve its
  configuration using sysupgrade.tgz.
  See https://github.com/openwrt/openwrt/pull/4182

Revert to stock firmware:
* Flash the stock firmware to the bootloader using TFTP/NMRP.

Signed-off-by: Wenli Looi <wlooi@ucalgary.ca>
(cherry picked from commit 73de41898fcd06d837b013449c370c493bcdc595)

1 files changed, 238 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7629-netgear-ex6250-v2.dts b/target/linux/mediatek/dts/mt7629-netgear-ex6250-v2.dts
new file mode 100644
index 0000000000..5645ad799e
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7629-netgear-ex6250-v2.dts
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include "mt7629.dtsi"
+
+/ {
+	model = "Netgear EX6250 v2";
+	compatible = "netgear,ex6250-v2", "mediatek,mt7629";
+
+	aliases {
+		led-boot = &led_power_green;
+		led-failsafe = &led_power_red;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_red;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs-override = "console=ttyS0,115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&pio 60 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&pio 58 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+
+		ap_mode {
+			label = "ap_mode";
+			gpios = <&pio 54 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_0>;
+		};
+
+		extender_mode {
+			label = "extender_mode";
+			gpios = <&pio 53 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_1>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power_green: power_green {
+			label = "green:power";
+			gpios = <&pio 21 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_red: power_red {
+			label = "red:power";
+			gpios = <&pio 61 GPIO_ACTIVE_LOW>;
+		};
+
+		client_green {
+			label = "green:client";
+			gpios = <&pio 59 GPIO_ACTIVE_LOW>;
+		};
+
+		client_red {
+			label = "red:client";
+			gpios = <&pio 24 GPIO_ACTIVE_LOW>;
+		};
+
+		router_green {
+			label = "green:router";
+			gpios = <&pio 55 GPIO_ACTIVE_LOW>;
+		};
+
+		router_red {
+			label = "red:router";
+			gpios = <&pio 56 GPIO_ACTIVE_LOW>;
+		};
+
+		wps_green {
+			label = "green:wps";
+			gpios = <&pio 57 GPIO_ACTIVE_LOW>;
+		};
+
+		eth_green {
+			label = "green:eth";
+			gpios = <&pio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		eth_yellow {
+			label = "yellow:eth";
+			gpios = <&pio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&eth_pins>;
+	pinctrl-1 = <&ephy_leds_pins>;
+	status = "okay";
+
+	mac@1 {
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "gmii";
+		phy-handle = <&phy0>;
+	};
+
+	mdio-bus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		phy0: ethernet-phy@0 {
+			reg = <0>;
+		};
+	};
+};
+
+&qspi {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&qspi_pins>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "Bootloader";
+				reg = <0x0 0x60000>;
+				read-only;
+			};
+
+			partition@60000 {
+				label = "Config";
+				reg = <0x60000 0x10000>;
+				read-only;
+			};
+
+			partition@70000 {
+				label = "Factory";
+				reg = <0x70000 0x10000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "firmware";
+				reg = <0x80000 0xcd0000>;
+				compatible = "denx,fit";
+			};
+
+			partition@d50000 {
+				label = "CFG";
+				reg = <0xd50000 0x80000>;
+				read-only;
+			};
+
+			partition@dd0000 {
+				label = "RAE";
+				reg = <0xdd0000 0x200000>;
+				read-only;
+			};
+
+			partition@fd0000 {
+				label = "POT";
+				reg = <0xfd0000 0x10000>;
+				read-only;
+			};
+
+			partition@fe0000 {
+				label = "LOG";
+				reg = <0xfe0000 0x20000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&pio {
+	eth_pins: eth-pins {
+		mux {
+			function = "eth";
+			groups = "mdc_mdio";
+		};
+	};
+
+	ephy_leds_pins: ephy-leds-pins {
+		mux {
+			function = "led";
+			groups = "ephy_leds";
+		};
+	};
+
+	qspi_pins: qspi-pins {
+		mux {
+			function = "flash";
+			groups = "spi_nor";
+		};
+	};
+
+	uart0_pins: uart0-pins {
+		mux {
+			function = "uart";
+			groups = "uart0_txd_rxd" ;
+		};
+	};
+
+	watchdog_pins: watchdog-pins {
+		mux {
+			function = "watchdog";
+			groups = "watchdog";
+		};
+	};
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+	status = "okay";
+};
+
+&watchdog {
+	pinctrl-names = "default";
+	pinctrl-0 = <&watchdog_pins>;
+	status = "okay";
+};