ath79: add support for Buffalo WHR-G301N

Buffalo WHR-G301N is a 2.4 GHz 11n router, based on Atheros AR7240.
Ported from ar71xx target.

Specification:

- Atheros AR7240
- 32 MB of RAM
- 4 MB of Flash
- 2.4 GHz 2T2R wifi
- 5x 10/100 Mbps Ethernet
- 9x LEDs, 4x keys
  - LED: 8x gpio-leds, 1x ath9k-leds
  - key: 2x buttons, 1x slide switch
- UART header on PCB
  - Vcc, GND, TX, RX from LEDs side
  - 115200n8

Flash instruction using factory image:

1. Connect the computer to the LAN port of WHR-G301N
2. Connect power cable to WHR-G301N and turn on it
3. Access to "http://192.168.11.1/" and open firmware update page
("ファーム更新")
4. Select the OpenWrt factory image and click execute ("実行") button
5. Wait ~150 seconds to complete flashing

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
[fix the SUPPORTED_DEVICES to be compatible with the ar71xx image]
Signed-off-by: Mathias Kresin <dev@kresin.me>

1 files changed, 192 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar7240_buffalo_whr-g301n.dts b/target/linux/ath79/dts/ar7240_buffalo_whr-g301n.dts
new file mode 100644
index 0000000000..c00509b429
--- /dev/null
+++ b/target/linux/ath79/dts/ar7240_buffalo_whr-g301n.dts
@@ -0,0 +1,192 @@
+// 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 "ar7240.dtsi"
+
+/ {
+	compatible = "buffalo,whr-g301n", "qca,ar7240";
+	model = "Buffalo WHR-G301N";
+
+	aliases {
+		led-boot = &diag;
+		led-failsafe = &diag;
+		led-upgrade = &diag;
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		router_on {
+			label = "router_on";
+			linux,code = <BTN_2>;
+			linux,input-type = <EV_SW>;
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		router_off {
+			label = "router_off";
+			linux,code = <BTN_3>;
+			linux,input-type = <EV_SW>;
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&switch_led_pins>;
+
+		security {
+			label = "whr-g301n:orange:security";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		diag: diag {
+			label = "whr-g301n:red:diag";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		router {
+			label = "whr-g301n:green:router";
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+		};
+
+		lan1 {
+			label = "whr-g301n:green:lan1";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		lan2 {
+			label = "whr-g301n:green:lan2";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		lan3 {
+			label = "whr-g301n:green:lan3";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		lan4 {
+			label = "whr-g301n:green:lan4";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		wan {
+			label = "whr-g301n:green:wan";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	ath9k-leds {
+		compatible = "gpio-leds";
+
+		wlan {
+			label = "whr-g301n:green:wlan";
+			gpios = <&ath9k 1 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+			linux,default-trigger = "phy0tpt";
+		};
+	};
+};
+
+&spi {
+	status = "okay";
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				reg = <0x0 0x3e000>;
+				label = "u-boot";
+				read-only;
+			};
+
+			partition@3e000 {
+				reg = <0x3e000 0x2000>;
+				label = "u-boot-env";
+				read-only;
+			};
+
+			partition@40000 {
+				reg = <0x40000 0x3a0000>;
+				label = "firmware";
+			};
+
+			partition@3e0000 {
+				reg = <0x3e0000 0x10000>;
+				label = "user_property";
+				read-only;
+			};
+
+			art: partition@3f0000 {
+				reg = <0x3f0000 0x10000>;
+				label = "art";
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x120c>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x120c>;
+	mtd-mac-address-increment = <1>;
+};
+
+&pcie {
+	status = "okay";
+
+	ath9k: wifi@0,0 {
+		compatible = "pci168c,002a";
+		reg = <0x0000 0 0 0 0>;
+		qca,no-eeprom;
+		mtd-mac-address = <&art 0x120c>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+};
+
+&pinmux {
+	switch_led_pins: switch_led_pins {
+		pinctrl-single,bits = <0x0 0x0 0xf8>;
+	};
+};
+
+&uart {
+	status = "okay";
+};