Ralink USB PHY driver

modulename: phy-ralink-usb.ko

configname: CONFIG_PHY_RALINK_USB

Linux Kernel Configuration
└─>Device Drivers
└─>PHY Subsystem
└─>Ralink USB PHY driver
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This option enables support for the Ralink USB PHY found inside
RT3352, MT7620, MT7628 and MT7688.

source code:
drivers/phy/ralink//phy-ralink-usb.c

depends
CONFIG_HAS_IOMEM
CONFIG_COMPILE_TEST or CONFIG_RALINK