Atheros AR71XX/9XXX USB PHY driver
modulename: phy-ath79-usb.ko
configname: CONFIG_PHY_ATH79_USB
Linux Kernel Configuration
└─>Device Drivers
└─>PHY Subsystem
└─>Device Tree and Open Firmware support
└─>Atheros AR71XX/9XXX USB PHY driver
In linux kernel since version 4.2 (release Date: 2015-08-30)
Enable this to support the USB PHY on Atheros AR71XX/9XXX SoCs.