mediatek: filogic: add support for Ubiquiti UniFi 6 Plus (U6+)

Ubiquiti U6+ is a dual-band WiFi 6 PoE access point.
It is a drop-in upgrade of the U6 lite.

Specifications
---

- SoC: MediaTek MT7981A dual-core ARM Cortex-A53 1.3 GHz
- RAM: 256 MB DDR3-2133 RAM
- Flash: 16 MB SPI NOR and 4 GB eMMC
- LAN: 1x Gigabit Ethernet with 802.3af/at support
- WLAN: MediaTek MT7976C 2x2 MIMO dual-band WiFi 6
- LEDs: 1x blue and 1x white
- Buttons: 1x reset button

Installation
---

1. Power device using a PoE injector or switch
2. Connect via Ethernet to the device with static IP 192.168.1.2
3. SSH into the device with password: ubnt

        $ ssh ubnt@192.168.1.20

4. Unlock kernel partitions for writing

        $ echo 5edfacbf > /proc/ubnthal/.uf

5. Confirm correct partitions

        $ grep PARTNAME /sys/block/mmcblk0/mmcblk0p6/uevent
        PARTNAME=kernel0
        $ grep PARTNAME /sys/block/mmcblk0/mmcblk0p7/uevent
        PARTNAME=kernel1
        $ grep PARTNAME /sys/block/mmcblk0/mmcblk0p8/uevent
        PARTNAME=bs

6. Set and confirm bootloader environment

        $ fw_setenv boot_openwrt "fdt addr \$(fdtcontroladdr); fdt rm /signature; bootubnt"
        $ fw_setenv bootcmd_real "run boot_openwrt"
        $ fw_printenv

7. Copy sysupgrade image to /tmp/openwrt.bin via scp
8. Copy kernel and rootfs to mmcblk0p6 and mmcblk0p7, respectively

        $ tar xf /tmp/openwrt.bin sysupgrade-ubnt_unifi-6-plus/kernel -O | dd of=/dev/mmcblk0p6
        $ tar xf /tmp/openwrt.bin sysupgrade-ubnt_unifi-6-plus/root -O | dd of=/dev/mmcblk0p7

9. Ensure device boots from mmcblk0p6

        $ echo -ne "\x00\x00\x00\x00\x2b\xe8\x4d\xa3" > /dev/mmcblk0p8

10. Reboot the device

        $ reboot

Signed-off-by: Elbert Mai <code@elbertmai.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>

1 files changed, 168 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7981a-ubnt-unifi-6-plus.dts b/target/linux/mediatek/dts/mt7981a-ubnt-unifi-6-plus.dts
new file mode 100644
index 00000000000..ece78ee50eb
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981a-ubnt-unifi-6-plus.dts
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+#include "mt7981.dtsi"
+
+/ {
+	model = "Ubiquiti UniFi 6 Plus";
+	compatible = "ubnt,unifi-6-plus", "mediatek,mt7981";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_white;
+		led-failsafe = &led_white;
+		led-running = &led_blue;
+		led-upgrade = &led_blue;
+		label-mac-device = &gmac1;
+	};
+
+	chosen {
+		bootargs-override = "console=ttyS0,115200n8 rootwait root=/dev/mmcblk0p7";
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_blue: dome-blue {
+			label = "blue:dome";
+			gpios = <&pio 9 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_white: dome-white {
+			label = "white:dome";
+			gpios = <&pio 34 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&pio {
+	spi2_flash_pins: spi2-pins {
+		mux {
+			function = "spi";
+			groups = "spi2", "spi2_wp_hold";
+		};
+
+		conf-pu {
+			pins = "SPI2_CS", "SPI2_HOLD", "SPI2_WP";
+			drive-strength = <8>;
+			bias-pull-up = <103>;
+		};
+
+		conf-pd {
+			pins = "SPI2_CLK", "SPI2_MOSI", "SPI2_MISO";
+			drive-strength = <8>;
+			bias-pull-down = <103>;
+		};
+	};
+
+	mmc0_pins_default: mmc0-pins-default {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+	};
+
+	mmc0_pins_uhs: mmc0-pins-uhs {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+	};
+};
+
+&spi2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi2_flash_pins>;
+	status = "okay";
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+
+		spi-max-frequency = <52000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			eeprom: partition@00000 {
+				label = "EEPROM";
+				reg = <0x00000 0x10000>;
+				read-only;
+
+				compatible = "nvmem-cells";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				macaddr_eeprom_0: macaddr@0 {
+					reg = <0x0 0x6>;
+				};
+
+				macaddr_eeprom_6: macaddr@6 {
+					reg = <0x6 0x6>;
+				};
+			};
+
+			partition@10000 {
+				label = "u-boot-env";
+				reg = <0x10000 0x80000>;
+			};
+		};
+	};
+};
+
+&mmc0 {
+	pinctrl-names = "default", "state_uhs";
+	pinctrl-0 = <&mmc0_pins_default>;
+	pinctrl-1 = <&mmc0_pins_uhs>;
+	bus-width = <8>;
+	max-frequency = <52000000>;
+	cap-mmc-highspeed;
+	vmmc-supply = <&reg_3p3v>;
+	non-removable;
+	status = "okay";
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio_pins>;
+	status = "okay";
+
+	gmac1: mac@1 {
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "gmii";
+		phy-handle = <&int_gbe_phy>;
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_eeprom_0>;
+	};
+};
+
+&wifi {
+	status = "okay";
+};