mediatek: add support for Zbtlink ZBT-Z8102AX

Specifications:
SoC: MediaTek MT7981B
RAM: 1024MiB
Flash: SPI-NAND 128 MiB
Switch: 1 WAN, 4 LAN (Gigabit)
USB: two M.2 slots for 5G modems via USB 3.0 hub, external USB 3.0 port
Buttons: Reset, Mesh
Power: DC 12V 1A
WiFi: MT7976CN
UART: 115200n8
UART Layout:
VCC-RX-TX-GND

Installation:
A. Through OpenWrt Dashboard:
If your router comes with OpenWrt preinstalled (modified by the seller),
you can easily upgrade by going to the dashboard (192.168.1.1) and then
navigate to System -> Backup/Flash firmware, then flash the firmware

B. Through TFTP
Standard installation via UART:

1. Connect USB Serial Adapter to the UART, (NOTE: Don't connect the VCC pin).
2. Power on the router. Make sure that you can access your router via UART.
3. Restart the router then repeatedly press ctrl + c to skip default boot.
4. Type > bootmenu
5. Press '2' to select upgrade firmware
6. Press 'Y' on 'Run image after upgrading?'
7. Press '0' and hit 'enter' to select TFTP client (default)
8. Fill the U-Boot's IP address and TFTP server's IP address.
9. Finally, enter the 'firmware' filename.

Based on patch adding support for similar Zbtlink ZBT-Z8103AX device by
Ian Ishmael C. Oderon.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/boot/uboot-envtools/files/mediatek_filogic

@@ -66,7 +66,8 @@ mercusys,mr90x-v1)
 	ubootenv_add_uci_config "$envdev" "0x0" "0x20000" "0x20000" "1"
 	;;
 cetron,ct3003|\
-netgear,wax220)
+netgear,wax220|\
+zbtlink,zbt-z8102ax)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x20000"
 	;;
 ubnt,unifi-6-plus)

target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8102ax.dts

@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+
+#include "mt7981.dtsi"
+
+/ {
+	model = "Zbtlink ZBT-Z8102AX";
+	compatible = "zbtlink,zbt-z8102ax", "mediatek,mt7981";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_status_green;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_green;
+		label-mac-device = &gmac0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs = "earlycon=uart8250,mmio32,0x11002000 console=ttyS0,115200n8 loglevel=8";
+	};
+
+	memory {
+		reg = <0 0x40000000 0 0x40000000>;
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		button-mesh {
+			label = "mesh";
+			linux,code = <BTN_0>;
+			gpios = <&pio 0 GPIO_ACTIVE_HIGH>;
+		};
+
+		button-hub {
+			label = "hub";
+			linux,code = <BTN_1>;
+			gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_red: red {
+			label = "red:status";
+			gpios = <&pio 9 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		led_status_green: green {
+			label = "green:status";
+			gpios = <&pio 10 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		blue {
+			label = "blue:status";
+			gpios = <&pio 11 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		4g {
+			label = "blue:4g";
+			gpios = <&pio 8 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_USB;
+			function-enumerator = <0>;
+		};
+
+		4g2 {
+			label = "blue:4g2";
+			gpios = <&pio 14 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_USB;
+			function-enumerator = <1>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+		gpios = <&pio 2 GPIO_ACTIVE_HIGH>;
+		hw_algo = "toggle";
+		hw_margin_ms = <1000>;
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+
+		pcie {
+			gpio-export,name = "pcie_power";
+			gpio-export,output = <1>;
+			gpios = <&pio 3 GPIO_ACTIVE_HIGH>;
+		};
+
+		5g1 {
+			gpio-export,name = "5g1";
+			gpio-export,output = <1>;
+			gpios = <&pio 4 GPIO_ACTIVE_HIGH>;
+		};
+
+		5g2 {
+			gpio-export,name = "5g2";
+			gpio-export,output = <1>;
+			gpios = <&pio 5 GPIO_ACTIVE_HIGH>;
+		};
+
+		sim1 {
+			gpio-export,name = "sim1";
+			gpio-export,output = <1>;
+			gpios = <&pio 6 GPIO_ACTIVE_HIGH>;
+		};
+
+		sim2 {
+			gpio-export,name = "sim2";
+			gpio-export,output = <1>;
+			gpios = <&pio 7 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&eth {
+	status = "okay";
+
+	gmac0: mac@0 {
+		/* LAN */
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+		phy-handle = <&phy0>;
+
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_factory_4 2>;
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
+	gmac1: mac@1 {
+		/* WAN */
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "gmii";
+		phy-handle = <&int_gbe_phy>;
+
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_factory_4 3>;
+	};
+};
+
+&mdio_bus {
+	switch: switch@1f {
+		compatible = "mediatek,mt7531";
+		reg = <0x1f>;
+		reset-gpios = <&pio 39 GPIO_ACTIVE_HIGH>;
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		interrupt-parent = <&pio>;
+		interrupts = <38 IRQ_TYPE_LEVEL_HIGH>;
+	};
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_flash_pins>;
+	status = "okay";
+
+	spi_nand@0 {
+		compatible = "spi-nand";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0>;
+
+		spi-max-frequency = <52000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-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 {
+				label = "bl2";
+				reg = <0x0000000 0x0100000>;
+				read-only;
+			};
+
+			partition@100000 {
+				label = "u-boot-env";
+				reg = <0x100000 0x80000>;
+			};
+
+			partition@180000 {
+				label = "Factory";
+				reg = <0x180000 0x200000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory: eeprom@0 {
+						reg = <0x0 0x1000>;
+					};
+
+					macaddr_factory_4: macaddr@4 {
+						compatible = "mac-base";
+						reg = <0x4 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@380000 {
+				label = "FIP";
+				reg = <0x380000 0x200000>;
+				read-only;
+			};
+
+			partition@580000 {
+				label = "ubi";
+				reg = <0x580000 0x4000000>;
+			};
+		};
+	};
+};
+
+&switch {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan1";
+		};
+
+		port@1 {
+			reg = <1>;
+			label = "lan2";
+		};
+
+		port@2 {
+			reg = <2>;
+			label = "lan3";
+		};
+
+		port@3 {
+			reg = <3>;
+			label = "lan4";
+		};
+
+		port@6 {
+			reg = <6>;
+			label = "cpu";
+			ethernet = <&gmac0>;
+			phy-mode = "2500base-x";
+
+			fixed-link {
+				speed = <2500>;
+				full-duplex;
+				pause;
+			};
+		};
+	};
+};
+
+&pio {
+	spi0_flash_pins: spi0-pins {
+		mux {
+			function = "spi";
+			groups = "spi0", "spi0_wp_hold";
+		};
+
+		conf-pu {
+			pins = "SPI0_CS", "SPI0_HOLD", "SPI0_WP";
+			drive-strength = <8>;
+			bias-pull-up = <103>;
+		};
+
+		conf-pd {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+			drive-strength = <8>;
+			bias-pull-down = <103>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&xhci {
+	status = "okay";
+};
+
+&wifi {
+	status = "okay";
+
+	nvmem-cells = <&eeprom_factory>;
+	nvmem-cell-names = "eeprom";
+};

target/linux/mediatek/filogic/base-files/etc/board.d/02_network

@@ -12,7 +12,8 @@ mediatek_setup_interfaces()
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 game" eth1
 		;;
 	asus,tuf-ax4200|\
-	mediatek,mt7981-rfb)
+	mediatek,mt7981-rfb|\
+	zbtlink,zbt-z8102ax)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" eth1
 		;;
 	asus,tuf-ax6000)

target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches

@@ -0,0 +1,19 @@
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+board=$(board_name)
+
+case "$board" in
+zbtlink,zbt-z8103ax)
+	ucidef_add_gpio_switch "5g1" "Power 1st modem" "5g1" "1"
+	ucidef_add_gpio_switch "5g2" "Power 2nd modem" "5g2" "1"
+	ucidef_add_gpio_switch "pcie" "Power PCIe port" "pcie" "1"
+	ucidef_add_gpio_switch "sim1" "SIM 1" "sim1" "1"
+	ucidef_add_gpio_switch "sim2" "SIM 2" "sim2" "1"
+	;;
+esac
+
+board_config_flush
+
+exit 0

target/linux/mediatek/filogic/base-files/etc/hotplug.d/ieee80211/11_fix_wifi_mac

@@ -95,6 +95,7 @@ case "$board" in
 	tplink,tl-xdr6088)
 		[ "$PHYNBR" = "0" ] && get_mac_label > /sys${DEVPATH}/macaddress
 		;;
+	zbtlink,zbt-z8102ax|\
 	zyxel,ex5601-t0)
 		addr=$(mtd_get_mac_binary "Factory" 0x4)
 		[ "$PHYNBR" = "1" ] && macaddr_add $addr 1 > /sys${DEVPATH}/macaddress

target/linux/mediatek/filogic/config-5.15

@@ -169,6 +169,8 @@ CONFIG_GENERIC_STRNLEN_USER=y
 CONFIG_GENERIC_TIME_VSYSCALL=y
 CONFIG_GLOB=y
 CONFIG_GPIO_CDEV=y
+CONFIG_GPIO_WATCHDOG=y
+CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y
 CONFIG_GRO_CELLS=y
 CONFIG_HANDLE_DOMAIN_IRQ=y
 CONFIG_HARDIRQS_SW_RESEND=y

target/linux/mediatek/filogic/config-6.1

@@ -187,6 +187,8 @@ CONFIG_GENERIC_STRNLEN_USER=y
 CONFIG_GENERIC_TIME_VSYSCALL=y
 CONFIG_GLOB=y
 CONFIG_GPIO_CDEV=y
+CONFIG_GPIO_WATCHDOG=y
+CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y
 CONFIG_GRO_CELLS=y
 CONFIG_HARDIRQS_SW_RESEND=y
 CONFIG_HAS_DMA=y

target/linux/mediatek/image/filogic.mk

@@ -728,6 +728,23 @@ endif
 endef
 TARGET_DEVICES += xiaomi_redmi-router-ax6000-ubootmod
 
+define Device/zbtlink_zbt-z8102ax
+  DEVICE_VENDOR := Zbtlink
+  DEVICE_MODEL := ZBT-Z8102AX
+  DEVICE_DTS := mt7981b-zbtlink-zbt-z8102ax
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_PACKAGES := kmod-mt7981-firmware mt7981-wo-firmware kmod-usb-net-qmi-wwan kmod-usb-serial-option
+  KERNEL_IN_UBI := 1
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += zbtlink_zbt-z8102ax
+
 define Device/zyxel_ex5601-t0-stock
   DEVICE_VENDOR := Zyxel
   DEVICE_MODEL := EX5601-T0  (stock layout)