ath79: Add support for TP-Link Archer C60 v1

TP-Link Archer C60v1 is a dual-band AC1350 router,
based on Qualcomm/Atheros QCA9561+QCA9886.

Specification:

- 775/650/258 MHz (CPU/DDR/AHB)
- 64 MB of RAM (DDR2)
- 8 MB of FLASH (SPI NOR)
- 3T3R 2.4 GHz
- 2T2R 5 GHz
- 5x 10/100 Mbps Ethernet
- 7x LED, 2x button
- UART header on PCB

Flash instruction (WebUI):
Download *-factory.bin image and upload it via the firmwary upgrade
function of the stock firmware WebUI.

Flash instruction (TFTP):
1. Set PC to fixed ip address 192.168.0.66
2. Download *-factory.bin image and rename it to tp_recovery.bin
3. Start a tftp server with the file tp_recovery.bin in its root directory
4. Turn off the router
5. Press and hold Reset button
6. Turn on router with the reset button pressed and wait ~15 seconds
7. Release the reset button and after a short time
the firmware should be transferred from the tftp server
8. Wait ~30 second to complete recovery.

Flash instruction under U-Boot, using UART:
1. tftp 0x81000000 ...-sysupgrade.bin
2. erase 0x9f020000 +$filesize
3. cp.b $fileaddr 0x9f020000 $filesize
4. reset

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit 6d313da6dc)

target/linux/ath79/dts/qca9561_tplink_archer-c60-v1.dts

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "qca9561_tplink_archer-c6x.dtsi"
+
+/ {
+	compatible = "tplink,archer-c60-v1", "qca,qca9561";
+	model = "TP-Link Archer C60 v1";
+};
+
+&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 {
+				label = "u-boot";
+				reg = <0x000000 0x010000>;
+				read-only;
+			};
+
+			mac: partition@10000 {
+				label = "mac";
+				reg = <0x010000 0x010000>;
+				read-only;
+			};
+
+			partition@20000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x020000 0x7c0000>;
+			};
+
+			partition@7e0000 {
+				label = "tplink";
+				reg = <0x7e0000 0x010000>;
+				read-only;
+			};
+
+			art: partition@7f0000 {
+				label = "art";
+				reg = <0x7f0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};

target/linux/ath79/dts/qca9561_tplink_archer-c6x.dtsi

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca956x.dtsi"
+
+/ {
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	aliases {
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		wifi_button {
+			label = "WiFi button";
+			linux,code = <KEY_RFKILL>;
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+		};
+
+		reset_button {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "tp-link:green:power";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wlan2g {
+			label = "tp-link:green:wlan2g";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		wlan5g {
+			label = "tp-link:green:wlan5g";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		wan_green {
+			label = "tp-link:green:wan";
+			gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
+		};
+
+		wan_amber {
+			label = "tp-link:amber:wan";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+
+		lan {
+			label = "tp-link:green:lan";
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "tp-link:green:wps";
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&pcie {
+	status = "okay";
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-mode = "mii";
+	phy-handle = <&swphy4>;
+
+	mtd-mac-address = <&mac 0x8>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&mac 0x8>;
+	mtd-mac-address-increment = <1>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&mac 0x8>;
+};