ath79: add support for Ubiquiti AirRouter

Indoor low-power router with 2.4 GHz radio

CPU:    Atheros AR7241 rev 1
RAM:    32 MB
Flash:  8 MB NOR SPI
Switch: Atheros AR7240
Ports:  1x WAN, 4x LAN 10/100 Ethernet
WLAN:   Atheros AR9285 (2.4 GHz)
USB:    1x USB2 host port

Note: Ethernet WAN/LAN port naming is reversed from ar71xx.
WAN is eth0; LAN is eth1.1.

UART settings: 115200, 8N1

                LEDs
        +--------------------------
        |
        |
        |
        |
        |
        |
        |
        |
    VCC | x x
     RX | * x
        | x x
        | x x
     TX | * x
    GND | * x
        |
        |
        |
        |
        +--------------------------
                ETHERNET PORTS

Installation from Ubiquiti firmware, is as for other ubnt-xm AirOs devices.

Signed-off-by: Russell Senior <russell@personaltelco.net>

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

@@ -124,7 +124,8 @@ ath79_setup_interfaces()
 	buffalo,whr-g301n|\
 	tplink,tl-mr3220-v1|\
 	tplink,tl-mr3420-v1|\
-	tplink,tl-wr841-v7)
+	tplink,tl-wr841-v7|\
+	ubnt,airrouter)
 		ucidef_set_interface_wan "eth0"
 		ucidef_add_switch "switch0" \
 			"0@eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1"

target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom

@@ -141,6 +141,7 @@ case "$FIRMWARE" in
 	tplink,tl-wr741-v1|\
 	tplink,tl-wr743nd-v1|\
 	tplink,tl-wr841-v7|\
+	ubnt,airrouter|\
 	ubnt,bullet-m|\
 	ubnt,nano-m|\
 	ubnt,rocket-m)

target/linux/ath79/dts/ar7241_ubnt_airrouter.dts

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar7241_ubnt_xm.dtsi"
+
+/ {
+	compatible = "ubnt,airrouter", "qca,ar7241";
+	model = "Ubiquiti AirRouter";
+
+	aliases {
+		led-boot = &globe;
+		led-failsafe = &globe;
+		led-running = &globe;
+		led-upgrade = &globe;
+	};
+
+	airrouter-leds {
+		compatible = "gpio-leds";
+
+		globe: globe {
+			label = "ubnt:green:globe";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		power {
+			label = "ubnt:green:power";
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&usb_phy {
+        status = "okay";
+};
+
+&usb {
+        status = "okay";
+};

target/linux/ath79/image/generic-ubnt.mk

@@ -78,6 +78,13 @@ define Device/ubnt-xw
   ATH_SOC := ar9342
 endef
 
+define Device/ubnt_airrouter
+  $(Device/ubnt-xm)
+  DEVICE_TITLE := Ubiquiti AirRouter
+  SUPPORTED_DEVICES += airrouter
+endef
+TARGET_DEVICES += ubnt_airrouter
+
 define Device/ubnt_bullet-m
   $(Device/ubnt-xm)
   DEVICE_TITLE := Ubiquiti Bullet-M