mediatek: filogic: add Acelink EW-7886CAX support

Acelink EW-7886CAX is an MT7986A (AKA Filogic 830) based access point.
It has 512 MiB of RAM, one 2.5 Gbps PoE (802.3at) Ethernet port and
on-SoC Wi-Fi. There is no printed MAC label (on my unit).

My unit came with Mediatek's firmware (based on OpenWrt 21.02)
installed. It was possible to simply upgrade using OpenWrt's sysupgrade
tool.

Another verified upgrade method is using U-Boot (requires UART). During
every boot there is "U-Boot Boot Menu". Selecting option "2. Upgrade
firmware" allows using U-Boot's tftp client to load and flash factory
image.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 07765f28b7911ca8207b6e7ec94508a5740c4697)

3 files changed, 258 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7986a-acelink-ew-7886cax.dts b/target/linux/mediatek/dts/mt7986a-acelink-ew-7886cax.dts
new file mode 100644
index 0000000000..1bf5d7317e
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7986a-acelink-ew-7886cax.dts
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/leds/common.h>
+
+#include "mt7986a.dtsi"
+
+/ {
+	compatible = "acelink,ew-7886cax", "mediatek,mt7986a";
+	model = "Acelink EW-7886CAX";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_status_blue;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_red;
+		led-failsafe = &led_status_red;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@40000000 {
+		reg = <0 0x40000000 0 0x20000000>;
+		device_type = "memory";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		key-restart {
+			label = "Reset";
+			gpios = <&pio 7 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_red: led-0 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_RED>;
+			gpios = <&pio 18 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_status_green: led-1 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&pio 19 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_status_blue: led-2 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&pio 20 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&crypto {
+	status = "okay";
+};
+
+&eth {
+	status = "okay";
+
+	mac@1 {
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "2500base-x";
+		phy-handle = <&phy6>;
+		nvmem-cells = <&macaddr>;
+		nvmem-cell-names = "mac-address";
+	};
+
+	mdio-bus {
+		reset-gpios = <&pio 6 GPIO_ACTIVE_LOW>;
+		reset-delay-us = <50000>;
+		reset-post-delay-us = <20000>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		/* Maxlinear GPY211C */
+		phy6: phy@6 {
+			compatible = "ethernet-phy-ieee802.3-c45";
+			reg = <6>;
+		};
+	};
+};
+
+&pcie_phy {
+	status = "okay";
+};
+
+&pio {
+	spi_flash_pins: spi-flash-pins-33-to-38 {
+		mux {
+			function = "spi";
+			groups = "spi0", "spi0_wp_hold";
+		};
+		conf-pu {
+			pins = "SPI2_CS", "SPI2_HOLD", "SPI2_WP";
+			drive-strength = <8>;
+			mediatek,pull-up-adv = <0>; /* bias-disable */
+		};
+		conf-pd {
+			pins = "SPI2_CLK", "SPI2_MOSI", "SPI2_MISO";
+			drive-strength = <8>;
+			mediatek,pull-down-adv = <0>; /* bias-disable */
+		};
+	};
+
+	wf_2g_5g_pins: wf_2g_5g-pins {
+		mux {
+			function = "wifi";
+			groups = "wf_2g", "wf_5g";
+		};
+		conf {
+			pins = "WF0_HB1", "WF0_HB2", "WF0_HB3", "WF0_HB4",
+			       "WF0_HB0", "WF0_HB0_B", "WF0_HB5", "WF0_HB6",
+			       "WF0_HB7", "WF0_HB8", "WF0_HB9", "WF0_HB10",
+			       "WF0_TOP_CLK", "WF0_TOP_DATA", "WF1_HB1",
+			       "WF1_HB2", "WF1_HB3", "WF1_HB4", "WF1_HB0",
+			       "WF1_HB5", "WF1_HB6", "WF1_HB7", "WF1_HB8",
+			       "WF1_TOP_CLK", "WF1_TOP_DATA";
+			drive-strength = <4>;
+		};
+	};
+
+	wf_dbdc_pins: wf-dbdc-pins {
+		mux {
+			function = "wifi";
+			groups = "wf_dbdc";
+		};
+		conf {
+			pins = "WF0_HB1", "WF0_HB2", "WF0_HB3", "WF0_HB4",
+				"WF0_HB0", "WF0_HB0_B", "WF0_HB5", "WF0_HB6",
+				"WF0_HB7", "WF0_HB8", "WF0_HB9", "WF0_HB10",
+				"WF0_TOP_CLK", "WF0_TOP_DATA", "WF1_HB1",
+				"WF1_HB2", "WF1_HB3", "WF1_HB4", "WF1_HB0",
+				"WF1_HB5", "WF1_HB6", "WF1_HB7", "WF1_HB8",
+				"WF1_TOP_CLK", "WF1_TOP_DATA";
+			drive-strength = <4>;
+		};
+	};
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi_flash_pins>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "spi-nand";
+		reg = <0>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		spi-max-frequency = <52000000>;
+		spi-rx-bus-width = <4>;
+		spi-tx-bus-width = <4>;
+		mediatek,nmbm;
+		mediatek,bmt-max-ratio = <1>;
+		mediatek,bmt-max-reserved-blocks = <64>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				reg = <0x0 0x100000>;
+				label = "bootloader";
+				read-only;
+			};
+
+			partition@100000 {
+				reg = <0x100000 0x80000>;
+				label = "u-boot-env";
+			};
+
+			partition@180000 {
+				compatible = "nvmem-cells";
+				reg = <0x180000 0x200000>;
+				label = "factory";
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom: eeprom@0 {
+						reg = <0x0 0x1000>;
+					};
+
+					macaddr: macaddr@4 {
+						reg = <0x4 0x6>;
+					};
+				};
+			};
+
+			partition@380000 {
+				reg = <0x380000 0x200000>;
+				label = "fip";
+			};
+
+			partition@580000 {
+				reg = <0x580000 0x4000000>;
+				label = "ubi";
+			};
+		};
+	};
+};
+
+&trng {
+	status = "okay";
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&wifi {
+	pinctrl-names = "default", "dbdc";
+	pinctrl-0 = <&wf_2g_5g_pins>;
+	pinctrl-1 = <&wf_dbdc_pins>;
+	nvmem-cells = <&eeprom>;
+	nvmem-cell-names = "eeprom";
+	status = "okay";
+};
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
index 857cc4b77e..901013aa59 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
@@ -8,6 +8,9 @@ mediatek_setup_interfaces()
 	local board="$1"
 
 	case $board in
+	acelink,ew-7886cax)
+		ucidef_set_interface_lan "eth0" "dhcp"
+		;;
 	acer,predator-w6)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 game" eth1
 		;;
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index 01e4f94f66..7249a2e236 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -105,6 +105,23 @@ define Build/cetron-header
 	rm $@.tmp
 endef
 
+define Device/acelink_ew-7886cax
+  DEVICE_VENDOR := Acelink
+  DEVICE_MODEL := EW-7886CAX
+  DEVICE_DTS := mt7986a-acelink-ew-7886cax
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_PACKAGES := kmod-mt7986-firmware mt7986-wo-firmware
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  KERNEL_IN_UBI := 1
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += acelink_ew-7886cax
+
 define Device/acer_predator-w6
   DEVICE_VENDOR := Acer
   DEVICE_MODEL := Predator W6