ramips: add support for Fon FON2601

FON2601 is a wireless router.

Specification:
- SoC: Mediatek MT7620A (580MHz)
- RAM: 128 MiB
- ROM: 16 MiB SPI Flash
- Wireless:
   for 11b/g/n (upto 300 Mbps):  MT7620A built-in WMAC
   for 11a/n/ac (upto 867 Mbps): MT7662E
- Ethernet LAN: 1 port, upto 100 Mbps
- Ethernet WAN: 1 port, upto 1000 Mbps
- USB: 1 port (USB 2.0 host)
- LEDs: 4 (all can be controlled by SoC's GPIO)
- buttons: 1 (Displayed as "WPS" on enclosure)
- serial port: 57600n8
 pins: Vcc(3.3V), Rx, Tx, GND
(left to right, viewed from outside of board)

Installation (only available via UART):
  1. download sysupgrade binary image by wget command
  2. write sysupgrade binary image to Flash
     command is:
       mtd write sysupgrade.bin firmware
  3. reboot

Important Notice:
  Only one button is displayed as "WPS" on enclosure.
  However, it is configured as "reset" (factory resetting feature).

Signed-off-by: NOGUCHI Hiroshi <drvlabo@gmail.com>
[removed unrelated openwrt-keyring revert, missing -Wall for uimage_padhdr]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

1 files changed, 166 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7620a_fon_fon2601.dts b/target/linux/ramips/dts/mt7620a_fon_fon2601.dts
new file mode 100644
index 0000000000..33329a1049
--- /dev/null
+++ b/target/linux/ramips/dts/mt7620a_fon_fon2601.dts
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "fon,fon2601", "ralink,mt7620a-soc";
+	model = "Fon FON2601";
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power_r {
+			label = "fon2601:red:power";
+			gpios = <&gpio0 9 GPIO_ACTIVE_LOW>;
+		};
+
+		internet_g {
+			label = "fon2601:green:internet";
+			gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
+		};
+
+		net_g {
+			label = "fon2601:green:net";
+			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi_g {
+			label = "fon2601:green:wifi";
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			factory: partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "fonfxc,uimage";
+				label = "firmware";
+				reg = <0x50000 0xf90000>;
+			};
+
+			partition@fe0000 {
+				label = "board_data";
+				reg = <0xfe0000 0x20000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		ralink,group = "i2c", "uartf";
+		ralink,function = "gpio";
+	};
+	nd_sd {
+		ralink,group = "nd_sd";
+		ralink,function = "sd";
+	};
+	spi_cs {
+		ralink,group = "spi refclk";
+		ralink,function = "spi refclk";
+	};
+};
+
+&ethernet {
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii2_pins &mdio_pins>;
+
+	mtd-mac-address = <&factory 0x4>;
+
+	port@4 {
+		status = "okay";
+		phy-handle = <&phy4>;
+		phy-mode = "rgmii";
+	};
+
+	mdio-bus {
+		status = "okay";
+
+		phy4: ethernet-phy@4 {
+			reg = <4>;
+			phy-mode = "rgmii";
+		};
+	};
+};
+
+&gsw {
+	mediatek,port4 = "gmac";
+};
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pa_pins>, <&wled_pins>;
+};
+
+&pcie {
+	status = "okay";
+};
+&pcie0 {
+	wifi@0,0 {
+		compatible = "pci14c3,7662";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};