mediatek: add support for Qihoo 360T7 (UBI layout)

This commit adds support for Qihoo 360T7 (UBI layout).

Aims
----
1. +20 MB additional free space for the packages
2. More reliable storage for the factory and fip partitions (in UBI)

Install (from non-UBI OpenWrt)
------------------------------
1. Navigate http://192.168.1.1/ and download mtd backups
2. Upgrade OpenWrt with installer initramfs image (force upgrade, don't
   keep settings). Wait until OpenWrt reboots and until installer:
   - Prepare new factory partition
   - Format new ubi
   - Make ubi volumes
   - Write new fip and bl2
3. Navigate http://192.168.1.1/ and Upgrade with OpenWrt 'sysupgrade.bin'
   image (don't keep settings)

Installer
---------
Based on OpenWrt UBI Installer Image Generator for Linksys E8450 and
Belkin RT3200
Link: https://github.com/dangowrt/owrt-ubi-installer

Ready installer image
Link: https://github.com/csharper2005/owrt-ubi-installer/tree/qihoo/bin

Installer script
Link: https://github.com/csharper2005/owrt-ubi-installer/blob/qihoo/files/
installer/install.sh

Committing to the parent Daniel's repository is not yet possible because
there are no official images and imagebuilder for Qihoo 360T7 (UBI) yet.

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>

Author: csharper2005

package/boot/uboot-tools/uboot-envtools/files/mediatek_filogic

@@ -46,6 +46,7 @@ netis,nx32u|\
 nokia,ea0326gmp|\
 openwrt,one|\
 qihoo,360t7|\
+qihoo,360t7-ubi|\
 routerich,ax3000-ubootmod|\
 routerich,be7200|\
 snr,snr-cpe-ax2|\

target/linux/mediatek/dts/mt7981b-qihoo-360t7-common.dtsi

@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+#include <dt-bindings/pinctrl/mt65xx.h>
+
+#include "mt7981b.dtsi"
+
+/ {
+	aliases: aliases {
+		led-boot = &led_status_red;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_green;
+
+		serial0 = &uart0;
+	};
+
+	chosen {
+		bootargs-append = " root=/dev/fit0 rootwait";
+		rootdisk = <&ubi_rootdisk>;
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@40000000 {
+		reg = <0 0x40000000 0 0x10000000>;
+		device_type = "memory";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-0 {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&pio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		button-1 {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_red: led-0 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_RED>;
+			gpios = <&pio 3 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_green: led-1 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&pio 7 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&eth {
+	status = "okay";
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+};
+
+&mdio_bus {
+	switch: switch@1f {
+		compatible = "mediatek,mt7531";
+		reg = <31>;
+		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";
+		reg = <0>;
+
+		spi-max-frequency = <52000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+
+		partitions: partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "bl2";
+				reg = <0x0 0x100000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&switch {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan3";
+		};
+
+		port@1 {
+			reg = <1>;
+			label = "lan2";
+		};
+
+		port@2 {
+			reg = <2>;
+			label = "lan1";
+		};
+
+		wan: port@3 {
+			reg = <3>;
+			label = "wan";
+		};
+
+		port@6 {
+			reg = <6>;
+			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 = <MTK_DRIVE_8mA>;
+			bias-disable; /* bias-disable */
+		};
+
+		conf-pd {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-disable; /* bias-disable */
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};

target/linux/mediatek/dts/mt7981b-qihoo-360t7-ubi.dts

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7981b-qihoo-360t7-common.dtsi"
+
+/ {
+	compatible = "qihoo,360t7-ubi", "mediatek,mt7981";
+	model = "Qihoo 360T7 (UBI)";
+
+	aliases {
+		label-mac-device = &wan;
+	};
+};
+
+&gmac0 {
+	nvmem-cell-names = "mac-address";
+	nvmem-cells = <&macaddr_factory_8000 (0)>;
+};
+
+&partitions {
+	partition@100000 {
+		reg = <0x100000 0x7f00000>;
+		compatible = "linux,ubi";
+		label = "ubi";
+
+		volumes {
+			ubi_factory: ubi-volume-factory {
+				volname = "factory";
+			};
+
+			ubi-volume-fip {
+				volname = "fip";
+			};
+
+			ubi_rootdisk: ubi-volume-fit {
+				volname = "fit";
+			};
+
+			ubi_ubootenv: ubi-volume-ubootenv {
+				volname = "ubootenv";
+			};
+
+			ubi_ubootenv2: ubi-volume-ubootenv2 {
+				volname = "ubootenv2";
+			};
+		};
+	};
+};
+
+&ubi_factory {
+	nvmem-layout {
+		compatible = "fixed-layout";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		eeprom_factory_0: eeprom@0 {
+			reg = <0x0 0x1000>;
+		};
+
+		macaddr_factory_8000: macaddr@8000 {
+			compatible = "mac-base";
+			reg = <0x8000 0x6>;
+			#nvmem-cell-cells = <1>;
+		};
+	};
+};
+
+&ubi_ubootenv {
+	nvmem-layout {
+		compatible = "u-boot,env-redundant-bool";
+		};
+	};
+
+&ubi_ubootenv2 {
+	nvmem-layout {
+		compatible = "u-boot,env-redundant-bool";
+	};
+};
+
+&wan {
+	nvmem-cell-names = "mac-address";
+	nvmem-cells = <&macaddr_factory_8000 (1)>;
+};
+
+&wifi {
+	status = "ok";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	nvmem-cells = <&eeprom_factory_0>;
+	nvmem-cell-names = "eeprom";
+
+	ieee80211-freq-limit = <2400000 2500000>, <5170000 5835000>;
+
+	band@0 {
+		reg = <0>;
+
+		nvmem-cells = <&macaddr_factory_8000 (2)>;
+		nvmem-cell-names = "mac-address";
+	};
+
+	band@1 {
+		reg = <1>;
+
+		nvmem-cells = <&macaddr_factory_8000 (3)>;
+		nvmem-cell-names = "mac-address";
+	};
+};