ramips: add support for Edimax EW-7478APC

SoC:	MediaTek MT7620a @ 580MHz
RAM:	64M (Winbond W9751G6KB-25)
FLASH:	8MB (Macronix)
WiFi:	SoC-integrated: MediaTek MT7620a bgn
WiFi:	MediaTek MT7612EN nac
Switch: Mediatek MT7530W Gigabit Switch (4 x LAN, 1 x WAN)
USB:	Yes 1 x 2.0 (+ 1 x 2.0 unpopulated header)
BTN:	Reset/WPS
LED:    - Power (white)
	- Internet (blue)
	- Wifi (blue)
	- USB (blue)
UART:  UART is present as Pads with throughholes on the PCB. They are
       located in the lower right corner (GbE ports facing up)
       3.3V - RX - GND - TX / 57600-8N1
       3.3V is the square pad

Installation
------------
Update the factory image via the web-interfaces (by default:
http://edimax.setup)

Signed-off-by: Birger Koblitz <mail@birger-koblitz.de>
[merge conflicts in 01_leds and mt7620.mk, dts whitespace issues]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

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

@@ -35,7 +35,8 @@ alfa-network,ac1200rm)
 	set_wifi_led "$boardname:green:wlan2g" "wlan1"
 	;;
 alfa-network,awusfree1|\
-edimax,br-6478ac-v2)
+edimax,br-6478ac-v2|\
+edimax,ew-7478apc)
 	set_wifi_led "$boardname:blue:wlan"
 	;;
 edimax,ew-7476rpc|\

target/linux/ramips/dts/EW-7478APC.dts

@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "edimax,ew-7478apc", "ralink,mt7620a-soc";
+	model = "Edimax EW-7478APC";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		reset_wps {
+			label = "reset_wps";
+			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "ew-7478apc:white:power";
+			gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
+		};
+
+		internet {
+			label = "ew-7478apc:blue:internet";
+			gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan {
+			label = "ew-7478apc:blue:wlan";
+			gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "ew-7478apc:blue:usb";
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&ohci_port1>, <&ehci_port1>;
+			linux,default-trigger = "usbport";
+		};
+	};
+};
+
+&gpio2 {
+	status = "okay";
+
+	enable_usb_power {
+		gpio-hog;
+		line-name = "enable USB power";
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		output-high;
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		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>;
+				read-only;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				label = "cimage";
+				reg = <0x50000 0x20000>;
+				read-only;
+			};
+
+			partition@70000 {
+				compatible = "edimax,uimage";
+				label = "firmware";
+				reg = <0x00070000 0x00790000>;
+			};
+		};
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c", "uartf", "nd_sd";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&ethernet {
+	status = "okay";
+	mtd-mac-address = <&factory 0x4>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>;
+	mediatek,portmap = "wllll";
+
+	port@5 {
+		status = "okay";
+		mediatek,fixed-link = <1000 1 1 1>;
+		phy-mode = "rgmii";
+	};
+
+	mdio-bus {
+		status = "okay";
+
+		phy0: ethernet-phy@0 {
+			reg = <0>;
+			phy-mode = "rgmii";
+		};
+
+		phy1: ethernet-phy@1 {
+			reg = <1>;
+			phy-mode = "rgmii";
+		};
+
+		phy2: ethernet-phy@2 {
+			reg = <2>;
+			phy-mode = "rgmii";
+		};
+
+		phy3: ethernet-phy@3 {
+			reg = <3>;
+			phy-mode = "rgmii";
+		};
+
+		phy4: ethernet-phy@4 {
+			reg = <4>;
+			phy-mode = "rgmii";
+		};
+
+		phy1f: ethernet-phy@1f {
+			reg = <0x1f>;
+			phy-mode = "rgmii";
+		};
+	};
+};
+
+&gsw {
+	mediatek,port4 = "gmac";
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		mediatek,2ghz = <0>;
+	};
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};

target/linux/ramips/image/mt7620.mk

@@ -642,6 +642,18 @@ define Device/edimax_ew-7478ac
 endef
 TARGET_DEVICES += edimax_ew-7478ac
 
+define Device/edimax_ew-7478apc
+  DTS := EW-7478APC
+  DEVICE_TITLE := Edimax EW-7478APC
+  BLOCKSIZE := 4k
+  IMAGE_SIZE := 7744k
+  IMAGE/sysupgrade.bin := append-kernel | append-rootfs | \
+        edimax-header -s CSYS -m RN75 -f 0x70000 -S 0x01100000 | pad-rootfs | \
+        append-metadata | check-size $$$$(IMAGE_SIZE)
+  DEVICE_PACKAGES := kmod-mt76x2 kmod-usb2 kmod-usb-ohci kmod-usb-ledtrig-usbport
+endef
+TARGET_DEVICES += edimax_ew-7478apc
+
 define Device/tplink_c2-v1
   $(Device/Archer)
   DTS := ArcherC2-v1