Atheros ath9k PCI/PCIe bus support

configname: CONFIG_ATH9K_PCI

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros Wireless Cards
└─>Atheros ath9k PCI/PCIe bus support
In linux kernel since version 3 (release Date: 2011-07-21)  
This option enables the PCI bus support in ath9k.

Say Y, if you have a compatible PCI/PCIe wireless card.