ramips: add support for minew g1-c

The minew g1-c is a smart home gateway / BLE gateway.
A Nordic nRF52832 is available via USB UART (cp210x) to support BLE.
The LED ring is a ring of 24x ws2812b connect to a generic GPIO (unsupported).
There is a small LED which is only visible when the device is open which
will be used as LED until the ws2812b is supported.
The board has also a micro sdcard/tfcard slot (untested).
The Nordic nRF52832 exposes SWD over a 5pin header (GND, VCC, SWD, SWC, RST).
The vendor uses an older OpenWrt version, sysupgrade can be used via
serial or ssh.

CPU:		MT7628AN / 580MHz
RAM:		DDR2 128 MiB RAM
Flash:		SPI NOR 16 MiB W25Q128
Ethernet:	1x 100 mbit (Port 0) (PoE in)
USB:		USB hub, 2x external, 1x internal to USB UART
Power:		via micro usb or PoE 802.11af
UART:		3.3V, 115200 8n1

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

target/linux/ramips/dts/mt7628an_minew_g1-c.dts

@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7628an.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "Minew G1-C";
+	compatible = "minew,g1-c", "mediatek,mt7628an-soc";
+
+	aliases {
+		led-boot = &led_system;
+		led-failsafe = &led_system;
+		led-running = &led_system;
+		led-upgrade = &led_system;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x8000000>;
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 38 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system: system {
+			label = "red:system";
+			gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
+			default-state = "on";
+		};
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+
+		ws2812 {
+			gpio-export,name = "ws2812";
+			gpio-export,output = <1>;
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		};
+
+		nrf_power {
+			gpio-export,name = "nrf_power";
+			gpio-export,output = <1>;
+			gpios = <&gpio 45 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "gpio";
+		function = "gpio";
+	};
+
+	p0led_an {
+		groups = "p0led_an";
+		function = "gpio";
+	};
+
+	uart1 {
+		groups = "uart1";
+		function = "gpio";
+	};
+
+	wdt {
+		groups = "wdt";
+		function = "gpio";
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi_pins>, <&spi_cs1_pins>;
+
+	m25p80@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>;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x28>;
+};
+
+&esw {
+	mediatek,portmap = <0x3e>;
+};
+
+&wmac {
+	status = "okay";
+};
+
+&sdhci {
+	status = "okay";
+	mediatek,cd-high;
+};

target/linux/ramips/image/mt76x8.mk

@@ -269,6 +269,15 @@ define Device/mercury_mac1200r-v2
 endef
 TARGET_DEVICES += mercury_mac1200r-v2
 
+define Device/minew_g1-c
+  IMAGE_SIZE := 15744k
+  DEVICE_VENDOR := Minew
+  DEVICE_MODEL := G1-C
+  DEVICE_PACKAGES := kmod-usb2 kmod-usb-ohci kmod-usb-ledtrig-usbport kmod-usb-serial-cp210x
+  SUPPORTED_DEVICES += minew-g1c
+endef
+TARGET_DEVICES += minew_g1-c
+
 define Device/netgear_r6020
   $(Device/netgear_sercomm_nor)
   IMAGE_SIZE := 7104k

target/linux/ramips/mt76x8/base-files/etc/board.d/02_network

@@ -15,6 +15,7 @@ ramips_setup_interfaces()
 	glinet,vixmini|\
 	hak5,wifi-pineapple-mk7|\
 	mediatek,linkit-smart-7688|\
+	minew,g1-c|\
 	onion,omega2p|\
 	onion,omega2|\
 	ravpower,rp-wd009|\