ramips: add support for Linksys E7350

Linksys E7350 is an 802.11ax (Wi-Fi 6) router, based on MediaTek
MT7621A.

Specifications:
- SoC: MT7621 (880MHz, 2 Cores)
- RAM: 256 MB
- Flash: 128 MB NAND
- Wi-Fi:
  - MT7915D: 2.4/5 GHz (DBDC)
- Ethernet: 5x 1GiE MT7530
- USB: 1x USB 3.0
- UART: J4 (57600 baud)
  - Pinout: [3V3] (TXD) (RXD) (blank) (GND)

Notes:
* This device has a dual-boot partition scheme, but this firmware works
  only on boot partition 1.

Installation:

Upload the generated factory.bin image via the stock web firmware
updater.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

7 files changed, 227 insertions, 2 deletions

diff --git a/target/linux/ramips/dts/mt7621_linksys_e7350.dts b/target/linux/ramips/dts/mt7621_linksys_e7350.dts
new file mode 100644
index 0000000000..0cdfcb4683
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_linksys_e7350.dts
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "linksys,e7350", "mediatek,mt7621-soc";
+	model = "Linksys E7350";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-wps {
+			color = <LED_COLOR_ID_AMBER>;
+			function = LED_FUNCTION_WPS;
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power: led-power {
+			label = "blue:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		led-wan {
+			color = <LED_COLOR_ID_AMBER>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		led-wan2 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_WAN;
+			gpios = <&switch0 0 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan4 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <4>;
+			gpios = <&switch0 3 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan3 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <3>;
+			gpios = <&switch0 6 GPIO_ACTIVE_LOW>;
+		};
+
+		led-lan2 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <2>;
+			gpios = <&switch0 9 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-lan1 {
+			color = <LED_COLOR_ID_BLUE>;
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <1>;
+			gpios = <&switch0 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "Boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "Config";
+			reg = <0x80000 0x80000>;
+		};
+
+		factory: partition@100000 {
+			label = "Factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "firmware";
+			reg = <0x180000 0x3000000>;
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x400000 0x2c00000>;
+			};
+		};
+
+		partition@3180000 {
+			label = "alt_firmware";
+			reg = <0x3180000 0x3000000>;
+			read-only;
+		};
+
+		partition@6180000 {
+			label = "cbtinfo";
+			reg = <0x6180000 0x80000>;
+			read-only;
+		};
+		/* seems to be the end here. Can't read past 0x6200000 */
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0000>;
+	};
+};
+
+&gmac1 {
+	status = "okay";
+	label = "wan";
+	phy-handle = <&ethphy0>;
+};
+
+&mdio {
+	ethphy0: ethernet-phy@0 {
+		reg = <0>;
+	};
+};
+
+&switch0 {
+	gpio-controller;
+	#gpio-cells = <2>;
+
+	ports {
+		port@1 {
+			status = "okay";
+			label = "lan4";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan3";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "lan1";
+		};
+	};
+};
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 974299f26b..661f44d5e9 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -1192,6 +1192,15 @@ define Device/linksys_e5600
 endef
 TARGET_DEVICES += linksys_e5600
 
+define Device/linksys_e7350
+  $(Device/belkin_rt1800)
+  DEVICE_VENDOR := Linksys
+  DEVICE_MODEL := E7350
+  IMAGE/factory.bin := append-kernel | pad-to $$$$(KERNEL_SIZE) | \
+	append-ubi | check-size | belkin-header GOLF 1 9.9.9
+endef
+TARGET_DEVICES += linksys_e7350
+
 define Device/linksys_ea7xxx
   $(Device/dsa-migration)
   $(Device/uimage-lzma-loader)
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds b/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
index aebdcd5ad9..0ac67e9670 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
@@ -75,6 +75,13 @@ gnubee,gb-pc2)
 linksys,e5600)
 	ucidef_set_led_netdev "wan" "wan link" "blue:wan" "wan" "link"
 	;;
+linksys,e7350)
+	ucidef_set_led_netdev "lan1" "lan1" "blue:lan-1" "lan1"
+	ucidef_set_led_netdev "lan2" "lan2" "blue:lan-2" "lan2"
+	ucidef_set_led_netdev "lan3" "lan4" "blue:lan-3" "lan3"
+	ucidef_set_led_netdev "lan4" "lan4" "blue:lan-4" "lan4"
+	ucidef_set_led_netdev "wan" "wan" "blue:wan" "wan"
+	;;
 linksys,ea6350-v4|\
 linksys,ea7300-v1|\
 linksys,ea7300-v2|\
diff --git a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
index 5b9eca0779..f3913a1d1c 100644
--- a/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt7621/base-files/etc/board.d/02_network
@@ -205,7 +205,8 @@ ramips_setup_macs()
 		wan_mac=$lan_mac
 		label_mac=$lan_mac
 		;;
-	belkin,rt1800)
+	belkin,rt1800|\
+	linksys,e7350)
 		lan_mac=$(mtd_get_mac_ascii Config lan_hwaddr)
 		wan_mac=$(mtd_get_mac_ascii Config wan_hwaddr)
 		label_mac=$lan_mac
diff --git a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
index 98bc6c1ccf..3c2872ae2c 100644
--- a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
+++ b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
@@ -84,7 +84,8 @@ case "$board" in
 		[ "$PHYNBR" = "0" ] && macaddr_add $hw_mac_addr 1 > /sys${DEVPATH}/macaddress
 		[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr 2 > /sys${DEVPATH}/macaddress
 		;;
-	belkin,rt1800)
+	belkin,rt1800|\
+	linksys,e7350)
 		hw_mac_addr=$(mtd_get_mac_ascii Config wan_hwaddr)
 		[ "$PHYNBR" = "0" ] && macaddr_add $hw_mac_addr 1 > /sys${DEVPATH}/macaddress
 		[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr 2 > /sys${DEVPATH}/macaddress
diff --git a/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount b/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
index a77fc41f07..99b318a922 100755
--- a/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
+++ b/target/linux/ramips/mt7621/base-files/etc/init.d/bootcount
@@ -23,6 +23,7 @@ boot() {
 		mtd resetbc s_env || true
 		;;
 	belkin,rt1800|\
+	linksys,e7350|\
 	samknows,whitebox-v8)
 		fw_setenv bootcount 0
 		;;
diff --git a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
index 997b4d35ff..05907536fe 100755
--- a/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ramips/mt7621/base-files/lib/upgrade/platform.sh
@@ -71,6 +71,7 @@ platform_do_upgrade() {
 	iptime,t5004|\
 	jcg,q20|\
 	linksys,e5600|\
+	linksys,e7350|\
 	linksys,ea6350-v4|\
 	linksys,ea7300-v1|\
 	linksys,ea7300-v2|\