ath79: add support for Comfast CF-EW71 v2

Specifications:
Qualcomm/Atheros QCA9531
2x 10/100 Mbps Ethernet, with 48v PoE
2T2R 2.4 GHz, 802.11b/g/n
128MB RAM
16MB SPI Flash
4x LED (Always On Power, LAN, WAN, WLAN)

Flashing instructions:
The original firmware is based on OpenWrt, so flashing the sysupgrade image over the factory firmware is sufficient.
The bootloader has a built-in recovery web-ui. This is the method I used to flash OpenWrt. You can get to the recovery web-ui by holding down the reset button for a few seconds (~5s) while pluggin in the router. The LEDs should start blinking fast and the router should be available on 192.168.1.1 for the recovery.

Tested: Reset button, WAN LED, LAN LED, Power LED (always on, not much to test), WLAN LED, MAC addresses (same as factory firmware).

Signed-off-by: Felix Golatofski <git@xdfr.de>

target/linux/ath79/dts/qca9531_comfast_cf-ew71-v2.dts

@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca953x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "comfast,cf-ew71-v2", "qca,qca9531";
+	model = "COMFAST CF-EW71 v2";
+
+	aliases {
+		serial0 = &uart;
+		led-boot = &led_wan;
+		led-failsafe = &led_wan;
+		led-upgrade = &led_wan;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&jtag_disable_pins>;
+
+		lan {
+			function = LED_FUNCTION_LAN;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+		};
+
+		led_wan: wan {
+			function = LED_FUNCTION_WAN;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan {
+			function = LED_FUNCTION_WLAN;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+
+		gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		hw_algo = "toggle";
+		hw_margin_ms = <1200>;
+		always-running;
+	};
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "winbond,w25q128", "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x010000>;
+				read-only;
+			};
+
+			art: partition@10000 {
+				label = "art";
+				reg = <0x010000 0x010000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					macaddr_art_0: macaddr@0 {
+						compatible = "mac-base";
+						reg = <0x0 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@20000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x020000 0xfd0000>;
+			};
+
+			partition@ff0000 {
+				label = "nvram";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy4>;
+
+	nvmem-cells = <&macaddr_art_0 1>;
+	nvmem-cell-names = "mac-address";
+};
+
+&eth1 {
+	nvmem-cells = <&macaddr_art_0 0>;
+	nvmem-cell-names = "mac-address";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	nvmem-cells = <&macaddr_art_0 3>;
+	nvmem-cell-names = "mac-address";
+};

target/linux/ath79/generic/base-files/etc/board.d/01_leds

@@ -199,6 +199,7 @@ comfast,cf-e560ac)
 	ucidef_set_led_switch "lan3" "LAN3" "blue:lan3" "switch0" "0x08"
 	ucidef_set_led_switch "lan4" "LAN4" "blue:lan4" "switch0" "0x10"
 	;;
+comfast,cf-ew71-v2|\
 comfast,cf-ew72|\
 openmesh,om2p-v2|\
 openmesh,om2p-hs-v1|\

target/linux/ath79/image/generic.mk

@@ -828,6 +828,16 @@ define Device/comfast_cf-e560ac
 endef
 TARGET_DEVICES += comfast_cf-e560ac
 
+define Device/comfast_cf-ew71-v2
+  SOC := qca9531
+  DEVICE_VENDOR := COMFAST
+  DEVICE_MODEL := CF-EW71
+  DEVICE_VARIANT := v2
+  DEVICE_PACKAGES := kmod-usb2 -uboot-envtools -swconfig
+  IMAGE_SIZE := 16192k
+endef
+TARGET_DEVICES += comfast_cf-ew71-v2
+
 define Device/comfast_cf-ew72
   SOC := qca9531
   DEVICE_VENDOR := COMFAST