ramips: add support for Netgear EAX12 series

Netgear EAX12, EAX11v2, EAX15v2 are wall-plug 802.11ax (Wi-Fi 6)
extenders that share the SoC, WiFi chip, and image format with the
WAX202.

Specifications:
* MT7621, 256 MiB RAM, 128 MiB NAND
* MT7915: 2.4/5 GHz 2x2 802.11ax (DBDC)
* Ethernet: 1 port 10/100/1000
* UART: 115200 baud (labeled on board)

All LEDs and buttons appear to work without state_default.

Installation:
* Flash the factory image through the stock web interface, or TFTP to
  the bootloader. NMRP can be used to TFTP without opening the case.

Revert to stock firmware:
* Flash the stock firmware to the bootloader using TFTP/NMRP.

References in GPL source:
https://www.downloads.netgear.com/files/GPL/EAX12_EAX11v2_EAX15v2_GPL_V1.0.3.34_src.tar.gz

* target/linux/ramips/dts/mt7621-rfb-ax-nand.dts
  DTS file for this device.

Signed-off-by: Wenli Looi <wlooi@ucalgary.ca>

1 files changed, 189 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_netgear_eax12.dts b/target/linux/ramips/dts/mt7621_netgear_eax12.dts
new file mode 100644
index 00000000000..d5ad404be0b
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_netgear_eax12.dts
@@ -0,0 +1,189 @@
+// 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>
+
+/ {
+	compatible = "netgear,eax12", "mediatek,mt7621-soc";
+	model = "Netgear EAX12";
+
+	aliases {
+		led-boot = &led_power_green;
+		led-failsafe = &led_power_red;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_red;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power_green: power_green {
+			label = "green:power";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_red: power_red {
+			label = "red:power";
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+		};
+
+		client_green {
+			label = "green:client";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		client_red {
+			label = "red:client";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		router_green {
+			label = "green:router";
+			gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+		};
+
+		router_red {
+			label = "red:router";
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		};
+
+		wps_green {
+			label = "green:wps";
+			gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+		};
+
+		eth_green {
+			label = "green:eth";
+			gpios = <&gpio 10 GPIO_ACTIVE_LOW>;
+		};
+
+		eth_yellow {
+			label = "yellow:eth";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "Bootloader";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "Config";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		factory: partition@100000 {
+			label = "Factory";
+			reg = <0x100000 0x80000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "firmware";
+			reg = <0x180000 0x3800000>;
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x400000 0x3400000>;
+			};
+		};
+
+		partition@2780000 {
+			label = "firmware_backup";
+			reg = <0x3980000 0x3800000>;
+			read-only;
+		};
+
+		partition@4d80000 {
+			label = "CFG";
+			reg = <0x7180000 0x200000>;
+			read-only;
+		};
+
+		partition@5580000 {
+			label = "RAE";
+			reg = <0x7380000 0x600000>;
+			read-only;
+		};
+
+		partition@5980000 {
+			label = "POT";
+			reg = <0x7980000 0x020000>;
+			read-only;
+		};
+
+		partition@6780000 {
+			label = "LOG";
+			reg = <0x79A0000 0x40000>;
+			read-only;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0>;
+	};
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "lan";
+		};
+	};
+};
+
+&xhci {
+	status = "disabled";
+};