mediatek/filogic: add Keenetic KN-3911 support

Specification:
 - MT7981 CPU using 2.4GHz and 5GHz WiFi (both AX)
 - 512MB RAM
 - 128MB SPI NAND
 - 2 LEDs (green, orange)
 - 3 buttons (fn, reset, wps)
 - 2 2.5Gbit ethernet ports based on Airoha EN8811H phy

Serial Interface:
 - 3 Pins GND, RX, TX
 - Settings: 115200, 8N1

Notes:
 - The device supports dual boot mode

Flash instruction:
The only way to flash OpenWrt image is to use tftp recovery mode in U-Boot:

1. Configure PC with static IP 192.168.1.2/24 and tftp server.
2. Rename "openwrt-mediatek-filogic-keenetic_kn-3911-squashfs-factory.bin"
   to "KN-3911_recovery.bin" and place it in tftp server directory.
3. Connect PC with ethernet port, press the reset button, power up
   the device and keep button pressed until status led start blinking.
4. Device will download file from server, write it to flash and reboot.

Signed-off-by: Maxim Anisimov <maxim.anisimov.ua@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16830
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mediatek/dts/mt7981b-keenetic-kn-3911.dts

@@ -0,0 +1,300 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+
+/dts-v1/;
+
+#include "mt7981.dtsi"
+
+/ {
+	model = "Keenetic KN-3911";
+	compatible = "keenetic,kn-3911", "mediatek,mt7981";
+
+	aliases {
+		label-mac-device = &gmac0;
+		led-boot = &status_led;
+		led-failsafe = &status_led;
+		led-running = &status_led;
+		led-upgrade = &status_led;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		button-fn {
+			label = "fn";
+			linux,code = <BTN_0>;
+			gpios = <&pio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		button-reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 24 GPIO_ACTIVE_LOW>;
+		};
+
+		button-wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&pio 29 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		status_led: led-0 {
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_STATUS;
+			gpios = <&pio 11 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-1 {
+			color = <LED_COLOR_ID_ORANGE>;
+			function = LED_FUNCTION_WPS;
+			gpios = <&pio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	virtual_flash {
+		compatible = "mtd-concat";
+		devices = <&firmware1 &firmware2>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x600000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x600000 0x0>;
+			};
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&eth {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mdio_pins>;
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+		phy-handle = <&phy10>;
+		label = "lan";
+
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_factory_4 0>;
+	};
+
+	gmac1: mac@1 {
+		compatible = "mediatek,eth-mac";
+		reg = <1>;
+		phy-mode = "2500base-x";
+		phy-handle = <&phy11>;
+		label = "wan";
+
+		nvmem-cell-names = "mac-address";
+		nvmem-cells = <&macaddr_factory_a 0>;
+	};
+};
+
+&mdio_bus {
+	phy10: ethernet-phy@a {
+		reg = <0xa>;
+		interrupt-parent = <&pio>;
+		interrupts = <38 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&pio 22 GPIO_ACTIVE_LOW>;
+		reset-assert-us = <10000>;
+		reset-deassert-us = <20000>;
+	};
+
+	phy11: ethernet-phy@b {
+		reg = <0xb>;
+		interrupt-parent = <&pio>;
+		interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&pio 27 GPIO_ACTIVE_LOW>;
+		reset-assert-us = <10000>;
+		reset-deassert-us = <20000>;
+	};
+};
+
+&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-pull-up = <MTK_PUPD_SET_R1R0_11>;
+		};
+
+		conf-pd {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+		};
+	};
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_flash_pins>;
+	status = "okay";
+
+	/* Winbond W25N01GVZEIG (128M) */
+	spi_nand@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		reg = <0>;
+
+		spi-max-frequency = <52000000>;
+		spi-tx-buswidth = <4>;
+		spi-rx-buswidth = <4>;
+
+		spi-cal-enable;
+		spi-cal-mode = "read-data";
+		spi-cal-datalen = <7>;
+		spi-cal-data = /bits/ 8 <0x53 0x50 0x49 0x4e 0x41 0x4e 0x44>;
+		spi-cal-addrlen = <5>;
+		spi-cal-addr = /bits/ 32 <0x0 0x0 0x0 0x0 0x0>;
+
+		mediatek,nmbm;
+		mediatek,bmt-max-ratio = <1>;
+		mediatek,bmt-max-reserved-blocks = <64>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			/* bl2 */
+			partition@0 {
+				label = "preloader";
+				reg = <0x0 0x80000>;
+				read-only;
+			};
+
+			/* fip */
+			partition@80000 {
+				label = "u-boot";
+				reg = <0x80000 0x200000>;
+				read-only;
+			};
+
+			partition@280000 {
+				label = "u-config";
+				reg = <0x280000 0x80000>;
+				read-only;
+			};
+
+			partition@300000 {
+				label = "rf-eeprom";
+				reg = <0x300000 0x200000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory_0: eeprom@0 {
+						reg = <0x0 0x1000>;
+					};
+
+					/* lan mac */
+					macaddr_factory_4: macaddr@4 {
+						compatible = "mac-base";
+						reg = <0x4 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+
+					/* wan mac */
+					macaddr_factory_a: macaddr@a {
+						compatible = "mac-base";
+						reg = <0xa 0x6>;
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			firmware1: partition@500000 {
+				label = "firmware_1";
+				reg = <0x500000 0x3500000>;
+			};
+
+			partition@3a00000 {
+				label = "config_1";
+				reg = <0x3a00000 0x80000>;
+				read-only;
+			};
+
+			partition@3a80000 {
+				label = "dump";
+				reg = <0x3a80000 0x80000>;
+				read-only;
+			};
+
+			partition@3c00000 {
+				label = "u-state";
+				reg = <0x3c00000 0x20000>;
+				read-only;
+			};
+
+			partition@3e80000 {
+				label = "u-config_res";
+				reg = <0x3e80000 0x80000>;
+				read-only;
+			};
+
+			partition@3f00000 {
+				label = "rf-eeprom_res";
+				reg = <0x3f00000 0x200000>;
+				read-only;
+			};
+
+			firmware2: partition@4100000 {
+				label = "firmware_2";
+				reg = <0x4140000 0x3500000>;
+			};
+
+			partition@7600000 {
+				label = "config_2";
+				reg = <0x7600000 0x80000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&wifi {
+	nvmem-cell-names = "eeprom";
+	nvmem-cells = <&eeprom_factory_0>;
+	status = "okay";
+};
+
+&sgmiisys0 {
+	/delete-node/ mediatek,pnswap;
+};

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

@@ -90,6 +90,13 @@ mediatek_setup_interfaces()
 	dlink,aquila-pro-ai-m30-a1)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" internet
 		;;
+	keenetic,kn-3911|\
+	smartrg,sdg-8622|\
+	smartrg,sdg-8632|\
+	smartrg,sdg-8733a|\
+	yuncore,ax835)
+		ucidef_set_interfaces_lan_wan lan wan
+		;;
 	mediatek,mt7986a-rfb)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4 lan6" "eth1 wan"
 		;;
@@ -102,12 +109,6 @@ mediatek_setup_interfaces()
 	mercusys,mr90x-v1)
 		ucidef_set_interfaces_lan_wan "lan0 lan1 lan2" eth1
 		;;
-	smartrg,sdg-8622|\
-	smartrg,sdg-8632|\
-	smartrg,sdg-8733a|\
-	yuncore,ax835)
-		ucidef_set_interfaces_lan_wan lan wan
-		;;
 	tplink,tl-xdr6086|\
 	wavlink,wl-wn586x3)
 		ucidef_set_interfaces_lan_wan "lan1 lan2" eth1

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

@@ -115,6 +115,10 @@ case "$board" in
 	jdcloud,re-cp-03)
 		[ "$PHYNBR" = "1" ] && mmc_get_mac_binary factory 0xa > /sys${DEVPATH}/macaddress
 		;;
+	keenetic,kn-3911)
+		[ "$PHYNBR" = "1" ] && \
+			macaddr_setbit_la "$(mtd_get_mac_binary rf-eeprom 0x4)" > /sys${DEVPATH}/macaddress
+		;;
 	mercusys,mr90x-v1|\
 	tplink,re6000xd)
 		addr=$(get_mac_binary "/tmp/tp_data/default-mac" 0)

target/linux/mediatek/image/filogic.mk

@@ -887,6 +887,26 @@ define Device/jdcloud_re-cp-03
 endef
 TARGET_DEVICES += jdcloud_re-cp-03
 
+define Device/keenetic_kn-3911
+  DEVICE_VENDOR := Keenetic
+  DEVICE_MODEL := KN-3911
+  DEVICE_DTS := mt7981b-keenetic-kn-3911
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_PACKAGES := kmod-mt7915e kmod-mt7981-firmware mt7981-wo-firmware kmod-phy-airoha-en8811h
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  KERNEL_SIZE := 6144k
+  IMAGE_SIZE := 108544k
+  KERNEL := kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb | \
+	append-squashfs4-fakeroot
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | \
+	append-ubi | check-size | zyimage -d 0x803911 -v "KN-3911"
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += keenetic_kn-3911
+
 define Device/mediatek_mt7981-rfb
   DEVICE_VENDOR := MediaTek
   DEVICE_MODEL := MT7981 rfb