mediatek: add support for GL.iNet GL-MT2500

Hardware
--------
SoC:  MediaTek MT7981BA
RAM:  1GB DDR4 (NANYA NT5AD512M16C4-JR)
MMC:  8GB eMMC (Samsung 8GTF4R)
ETH:  1000Base-T LAN (ePHY)
      2500Base-T WAN (MaxLinear GPY211C)
BTN:  1x Reset Button
LED:  System (blue/white)
      VPN (white)
USB:  1x USB-A (USB 3.0)
UART: 115200 8N1 - Pinout on board next to LAN port
      Don't connect 3.3V!

Known Issues
------------
U-Boot vendor recovery does not seem to accept any images, neither
GL.iNet images nor OpenWrt images. Recovery requires serial access!

Installation
------------
Upload the OpenWrt sysupgrade image to the Gl.iNet Web-UI. Make sure to
not retain existing settings.

Signed-off-by: David Bauer <mail@david-bauer.net>

1 files changed, 151 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7981b-glinet-gl-mt2500.dts b/target/linux/mediatek/dts/mt7981b-glinet-gl-mt2500.dts
new file mode 100644
index 0000000000..068dd0f236
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-glinet-gl-mt2500.dts
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+/dts-v1/;
+#include "mt7981.dtsi"
+
+/ {
+	model = "GL.iNet GL-MT2500";
+	compatible = "glinet,gl-mt2500", "mediatek,mt7981";
+
+	aliases {
+		label-mac-device = &gmac0;
+		led-boot = &led_sys_white;
+		led-failsafe = &led_sys_blue;
+		led-running = &led_sys_white;
+		led-upgrade = &led_sys_blue;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs-append = " root=PARTLABEL=rootfs rootwait";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-vpn {
+			label = "white:vpn";
+			gpios = <&pio 31 GPIO_ACTIVE_LOW>;
+		};
+
+		led_sys_white: led-system-white {
+			label = "white:system";
+			gpios = <&pio 30 GPIO_ACTIVE_LOW>;
+		};
+
+		led_sys_blue: led-system-blue {
+			label = "blue:system";
+			gpios = <&pio 29 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	usb_vbus: regulstor-usb {
+		compatible = "regulator-fixed";
+
+		regulator-name = "usb-vbus";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+
+		gpio = <&pio 12 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-boot-on;
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-3.3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+};
+
+&pio {
+	mmc0_pins_default: mmc0-pins-default {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+	};
+	mmc0_pins_uhs: mmc0-pins-uhs {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&eth {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio_pins>;
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+
+		phy-mode = "2500base-x";
+		phy-handle = <&phy5>;
+	};
+
+	gmac1: mac@1 {
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "gmii";
+		phy-handle = <&int_gbe_phy>;
+	};
+};
+
+&mdio_bus {
+	reset-gpios = <&pio 14 GPIO_ACTIVE_LOW>;
+	reset-delay-us = <600>;
+	reset-post-delay-us = <20000>;
+
+	phy5: ethernet-phy@5 {
+		reg = <5>;
+		compatible = "ethernet-phy-ieee802.3-c45";
+	};
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&xhci {
+	status = "okay";
+	vbus-supply = <&usb_vbus>;
+};
+
+&mmc0 {
+	status = "okay";
+
+	pinctrl-names = "default", "state_uhs";
+	pinctrl-0 = <&mmc0_pins_default>;
+	pinctrl-1 = <&mmc0_pins_uhs>;
+	bus-width = <8>;
+	max-frequency = <52000000>;
+	vmmc-supply = <&reg_3p3v>;
+	cap-mmc-highspeed;
+	non-removable;
+};