ath79: add TP-Link WR842N v3

This adds support for the TP-Link WR842N v3 which is already supported on ar71xx
target (0b45bec22c59cc6e6b2fa71dc9a88386c5587132).

Specification:
* SoC: QCA9533 ver 2 rev 0
* 16 MB Flash (gd25q128)
* 64 MB RAM
* 1 WAN 10/100 MBit/s (blue connector)
* 4 LAN 10/100 MBit/s (AR8229; 4 ports; yellow connectors)
* Atheros AR9531 (2,4GHz, two fixed antennas)
* USB
* Reset / WPS button
* WiFi button (rf kill)
* 8 green leds; 1 red/green led
* serial console (115200 8N1, according to the OpenWrt-wiki some soldering is needed)

Installation:
* flash via vendor WebUI (the filename must not exceed certain length)
* sysupgrade from installed OpenWrt (also ar71xx)

Thanks to Holger Drefs for providing the hardware

Tested-by: @kofec (github)
Signed-off-by: Sven Roederer <devel-sven@geroedel.de>

1 files changed, 168 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9533_tplink_tl-wr842n-v3.dts b/target/linux/ath79/dts/qca9533_tplink_tl-wr842n-v3.dts
new file mode 100644
index 0000000000..64be0744b2
--- /dev/null
+++ b/target/linux/ath79/dts/qca9533_tplink_tl-wr842n-v3.dts
@@ -0,0 +1,168 @@
+// 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 "qca953x.dtsi"
+
+/ {
+	compatible = "tplink,tl-wr842n-v3", "qca,qca9533";
+	model = "TP-Link TL-WR842N v3";
+
+	aliases {
+		led-boot = &qss_led;
+		led-failsafe = &qss_led;
+		led-running = &qss_led;
+		led-upgrade = &qss_led;
+	};
+
+	gpio_leds: leds {
+		compatible = "gpio-leds";
+
+		system: power {
+			label = "tp-link:green:power";
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wifi {
+			label = "tp-link:green:wlan";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		qss_led: qss {
+			label = "tp-link:green:qss";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+
+		wan_green {
+			label = "tp-link:green:wan";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+		};
+
+		wan_red {
+			label = "tp-link:red:wan";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		lan1 {
+			label = "tp-link:green:lan1";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		lan2 {
+			label = "tp-link:green:lan2";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		lan3 {
+			label = "tp-link:green:lan3";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		lan4 {
+			label = "tp-link:green:lan4";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		usb {
+			label = "tp-link:green:usb";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "usbport";
+			trigger-sources = <&hub_port>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		rfkill {
+			label = "RFKILL button";
+			linux,code = <KEY_RFKILL>;
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&usb0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	hub_port: port@1 {
+		reg = <1>;
+		#trigger-source-cells = <0>;
+	};
+};
+
+&usb_phy {
+        status = "okay";
+};
+
+&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>;
+
+			uboot: partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x020000>;
+				read-only;
+			};
+
+			partition@20000 {
+				compatible = "tplink,firmware";
+				label = "firmware";
+				reg = <0x020000 0xfd0000>;
+			};
+
+			art: partition@ff0000 {
+				label = "ART";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth1 {
+	mtd-mac-address = <&uboot 0x1fc00>;
+};
+
+&eth0 {
+	status = "okay";
+	phy-handle = <&swphy4>;
+
+	mtd-mac-address = <&uboot 0x1fc00>;
+	mtd-mac-address-increment = <1>;
+};
+
+&wmac {
+	status = "okay";
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&uboot 0x1fc00>;
+};
+