PHY Device support and infrastructure

modulename: libphy.ko

configname: CONFIG_PHYLIB

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PHY Device support and infrastructure
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Ethernet controllers are usually attached to PHY
devices. This option provides infrastructure for
managing PHY devices.

source code:
drivers/net/phy/