ath79: add support for ALFA Network Tube-2HQ

ALFA Network Tube-2HQ is a successor of the Tube-2H/P series (EOL) which
was based on the Atheros AR9331. The new version uses Qualcomm QCA9531.

Specifications:

- Qualcomm/Atheros QCA9531 v2
- 650/400/200 MHz (CPU/DDR/AHB)
- 64 or 128 MB of RAM (DDR2)
- 16+ MB of flash (SPI NOR)
- 1x 10/100 Mbps Ethernet with passive PoE input (24 V)
  (802.3at/af PoE support with optional module)
- 1T1R 2.4 GHz Wi-Fi with external PA (SE2623L, up to 27 dBm) and LNA
- 1x Type-N (male) antenna connector
- 6x LED (5x driven by GPIO)
- 1x button (reset)
- external h/w watchdog (EM6324QYSP5B, enabled by default)
- UART (4-pin, 2.00 mm pitch) header on PCB

Flash instruction:

You can use sysupgrade image directly in vendor firmware which is based
on LEDE/OpenWrt. Alternatively, you can use web recovery mode in U-Boot:

1. Configure PC with static IP 192.168.1.2/24.
2. Connect PC with one of RJ45 ports, press the reset button, power up
   device, wait for first blink of all LEDs (indicates network setup),
   then keep button for 3 following blinks and release it.
3. Open 192.168.1.1 address in your browser and upload sysupgrade image.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

target/linux/ath79/dts/qca9531_alfa-network_tube-2hq.dts

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca9531_alfa-network_r36a.dtsi"
+
+/ {
+	model = "ALFA Network Tube-2HQ";
+	compatible = "alfa-network,tube-2hq", "qca,qca9531";
+
+	aliases {
+		led-boot = &led_signal4;
+		led-failsafe = &led_signal4;
+		led-upgrade = &led_signal4;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&enable_gpio4 &enable_gpio16>;
+
+		lan {
+			label = "blue:lan";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		led_signal4: signal4 {
+			label = "green:signal4";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+		};
+
+		signal1 {
+			label = "red:signal1";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		signal2 {
+			label = "orange:signal2";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		signal3 {
+			label = "green:signal3";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&eth0 {
+	nvmem-cells = <&macaddr_art_1002>;
+	nvmem-cell-names = "mac-address";
+
+	mac-address-increment = <(-1)>;
+};
+
+&eth1 {
+	compatible = "syscon", "simple-mfd";
+};
+
+&usb0 {
+	status = "disabled";
+};
+
+&usb_phy {
+	status = "disabled";
+};

target/linux/ath79/generic/base-files/etc/board.d/01_leds

@@ -48,6 +48,14 @@ alfa-network,r36a)
 	ucidef_set_led_netdev "lan" "LAN" "blue:lan" "eth0"
 	ucidef_set_led_switch "wan" "WAN" "blue:wan" "switch0" "0x10"
 	;;
+alfa-network,tube-2hq)
+	ucidef_set_led_netdev "lan" "LAN" "blue:lan" "eth0"
+	ucidef_set_rssimon "wlan0" "200000" "1"
+	ucidef_set_led_rssi "signal1" "SIGNAL1" "red:signal1" "wlan0" "1" "100"
+	ucidef_set_led_rssi "signal2" "SIGNAL2" "orange:signal2" "wlan0" "25" "100"
+	ucidef_set_led_rssi "signal3" "SIGNAL3" "green:signal3" "wlan0" "50" "100"
+	ucidef_set_led_rssi "signal4" "SIGNAL4" "green:signal4" "wlan0" "75" "100"
+	;;
 asus,rp-ac66)
 	ucidef_set_rssimon "wlan0" "200000" "1"
 	ucidef_set_rssimon "wlan1" "200000" "1"

target/linux/ath79/generic/base-files/etc/board.d/02_network

@@ -13,6 +13,7 @@ ath79_setup_interfaces()
 	allnet,all-wap02860ac|\
 	alfa-network,ap121f|\
 	alfa-network,pi-wifi4|\
+	alfa-network,tube-2hq|\
 	arduino,yun|\
 	aruba,ap-105|\
 	asus,rp-ac66|\
@@ -529,6 +530,7 @@ ath79_setup_macs()
 	alfa-network,n5q|\
 	alfa-network,pi-wifi4|\
 	alfa-network,r36a|\
+	alfa-network,tube-2hq|\
 	engenius,eap300-v2|\
 	engenius,ens202ext-v1)
 		label_mac=$(mtd_get_mac_binary art 0x1002)

target/linux/ath79/image/generic.mk

@@ -298,6 +298,16 @@ define Device/alfa-network_r36a
 endef
 TARGET_DEVICES += alfa-network_r36a
 
+define Device/alfa-network_tube-2hq
+  SOC := qca9531
+  DEVICE_VENDOR := ALFA Network
+  DEVICE_MODEL := Tube-2HQ
+  DEVICE_PACKAGES := rssileds -swconfig
+  IMAGE_SIZE := 15872k
+  SUPPORTED_DEVICES += tube-2hq
+endef
+TARGET_DEVICES += alfa-network_tube-2hq
+
 define Device/allnet_all-wap02860ac
   $(Device/senao_loader_okli)
   SOC := qca9558