ath79: Add support for Buffalo WZR-HP-G300NH

This device is a wireless router working on 2.4GHz band based on
Qualcom/Atheros AR9132 rev 2 SoC and is accompanied by Atheros AR9103
wireless chip and Realtek RTL8366RB/S switches. Due to two different
switches being used also two different devices are provided.

  Specification:
  - 400 MHz CPU
  - 64 MB of RAM
  - 32 MB of FLASH (NOR)
  - 3x3:2 2.4 GHz 802.11bgn
  - 5x 10/100/1000 Mbps Ethernet
  - 4x LED, 3x button, On/Off slider, Auto/On/Off slider
  - 1x USB 2.0
  - bare UART header place on PCB

  Flash instruction:
  - NOTE: Pay attention to the switch variant and choose the image to
    flash accordingly. (dmesg / kernel logs can tell it)
  - Methods for flashing
    - Apply factory image in OEM firmware web-gui.
    - Sysupgrade on top of existing OpenWRT image
    - U-Boot TFPT recovery for both stock or OpenWRT images:
      The device U-boot contains a TFTP server that by default has
      an address 192.168.11.1 (MAC 02:AA:BB:CC:DD:1A). During the boot
      there is a time window, during which the device allows an image to
      be uploaded from a client with address 192.168.11.2. The image will
      be written on flash automatically.

      1) Have a computer with static IP address 192.168.11.2 and the
         router device switched off.
      2) Connect the LAN port next to the WAN port in the device and the
         computer using a network switch.
      3) Assign IP 192.168.11.1 the MAC address 02:AA:BB:CC:DD:1A
         arp -s 192.168.11.1 02:AA:BB:CC:DD:1A
      4) Initiate an upload using TFTP image variant
         curl -T <imagename> tftp://192.168.11.1
      5) Switch on the device. The image will be uploaded subsequently.
         You can keep an eye on the diag light on the device, it should
         keep on blinking for a while indicating the writing of the image.

  General notes:
  - In the stock firmware the MAC address is the same among all
    interfaces so it is left here that way too.

  Recovery:
  - TFTP method
  - U-boot serial console

  Differences to ar71xx platform
  - This device is split in two different targets now due to hardware
    being a bit different under the hood. Dynamic solution within the same
    image is left for later time.
  - GPIOs for a sliding On/Off switch, marked 'Movie engine' on the device
    cover, were the wrong way around and were renamed qos_on -> movie_off,
    qos_off -> movie_on. Associated key codes remained the same they were.

  The device tree source code is mostly based on musashino's work

Signed-off-by: Mauri Sandberg <sandberg@mailfence.com>

3 files changed, 301 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-rb.dts b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-rb.dts
new file mode 100644
index 0000000000..52b0c86d65
--- /dev/null
+++ b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-rb.dts
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9132_buffalo_wzr-hp-g300nh.dtsi"
+
+/ {
+	compatible = "buffalo,wzr-hp-g300nh-rb", "qca,ar9132";
+	model = "Buffalo WZR-HP-G300NH (rtl8366rb)";
+};
+
+&switch {
+	status = "okay";
+
+	compatible = "realtek,rtl8366rb";
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0x1f000000 0x13000a44 0x00441099>;
+};
+
+&eth1 {
+	status = "okay";
+
+	pll-data = <0x100 0x13000a44 0x00441099>;
+};
diff --git a/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-s.dts b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-s.dts
new file mode 100644
index 0000000000..1c4da1ed67
--- /dev/null
+++ b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh-s.dts
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9132_buffalo_wzr-hp-g300nh.dtsi"
+
+/ {
+	compatible = "buffalo,wzr-hp-g300nh-s", "qca,ar9132";
+	model = "Buffalo WZR-HP-G300NH (rtl8366s)";
+};
+
+&switch {
+	status = "okay";
+
+	compatible = "realtek,rtl8366s";
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0x1e000100 0x13000a44 0x00441099>;
+};
+
+&eth1 {
+	status = "okay";
+
+	pll-data = <0x1e000100 0x13000a44 0x00441099>;
+};
diff --git a/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi
new file mode 100644
index 0000000000..9bd4656d85
--- /dev/null
+++ b/target/linux/ath79/dts/ar9132_buffalo_wzr-hp-g300nh.dtsi
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9132.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	aliases {
+		led-boot = &led_diag;
+		led-failsafe = &led_security;
+		led-upgrade = &led_diag;
+	};
+
+	clock40mhz: ref {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <40000000>;
+	};
+
+	gpio2: gpio-extender {
+		compatible = "nxp,74hc153-gpio";
+		gpio-controller;
+		#gpio-cells = <2>;
+
+		// GPIOs used by this node
+		gpio-s0 = <&gpio 9 GPIO_ACTIVE_HIGH>;
+		gpio-s1 = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		gpio-1y = <&gpio 12 GPIO_ACTIVE_HIGH>;
+		gpio-2y = <&gpio 14 GPIO_ACTIVE_HIGH>;
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		aoss {
+			label = "aoss";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		router_on {
+			label = "router_on";
+			linux,code = <BTN_5>;
+			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+
+		movie_off {
+			label = "movie_off";
+			linux,code = <BTN_3>;
+			gpios = <&gpio2 3 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+
+		usb {
+			label = "usb";
+			linux,code = <BTN_2>;
+			gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		router_auto {
+			label = "router_auto";
+			linux,code = <BTN_6>;
+			gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+
+		movie_on {
+			label = "movie_on";
+			linux,code = <BTN_4>;
+			gpios = <&gpio2 7 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+	};
+
+	flash@1e000000 {
+		compatible = "cfi-flash";
+		reg = <0x1e000000 0x2000000>;
+		bank-width = <2>;
+		device-width = <2>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0000000 0x0040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x0040000 0x0020000>;
+				read-only;
+			};
+
+			partition@60000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x0060000 0x1f60000>;
+			};
+
+			partition@1fc0000 {
+				label = "user_property";
+				reg = <0x1fc0000 0x0020000>;
+				read-only;
+			};
+
+			art: partition@1fe0000 {
+				label = "art";
+				reg = <0x1fe0000 0x020000>;
+				read-only;
+			};
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		usb {
+			label = "blue:usb";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&hub_port>;
+			linux,default-trigger = "usbport";
+		};
+
+		led_diag: diag {
+			label = "red:diag";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		wireless {
+			label = "green:wireless";
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led_security: security {
+			label = "amber:security";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+
+		router {
+			label = "green:router";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	switch: switch {
+		status = "disabled";
+
+		gpio-sda = <&gpio 19 GPIO_ACTIVE_HIGH>;
+		gpio-sck = <&gpio 20 GPIO_ACTIVE_HIGH>;
+		mii-bus = <&mdio0>;
+
+		mdio-bus {
+			status = "okay";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			phy-mask = <0x10>;
+
+			phy4: ethernet-phy@4 {
+				reg = <4>;
+				phy-mode = "rgmii";
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+};
+
+&eth0 {
+	status = "disabled";
+
+	phy-mode = "rgmii";
+	mtd-mac-address = <&art 0x1120c>;
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+	};
+};
+
+&mdio1 {
+	status = "okay";
+};
+
+&eth1 {
+	status = "disabled";
+
+	compatible = "qca,ar9130-eth", "syscon";
+	reg = <0x1a000000 0x200
+		0x18070004 0x4>;
+
+	pll-reg = <0x4 0x18 22>;
+	pll-handle = <&pll>;
+
+	phy-mode = "rgmii";
+	phy-handle = <&phy4>;
+	resets = <&rst 13>;
+	reset-names = "mac";
+	qca,mac-idx = <1>;
+	mtd-mac-address = <&art 0x1120c>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x11000>;
+};
+
+&uart {
+	status = "okay";
+};
+
+&pll {
+	clocks = <&clock40mhz>;
+};
+
+&usb {
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	hub_port: port@1 {
+		reg = <1>;
+		#trigger-source-cells = <0>;
+	};
+};
+
+&usb_phy {
+	status = "okay";
+};