Atheros AR5523 configuration on Raspberry Pi 2

Installing and Using OpenWrt Network and Wireless Configuration
#1

Hi,

My wireless network card doesn't show up on ifconfig -a.
In the openwrt wiki it said to install the kmod-ath5k package but I cannot find this package.
opkg install kmod-net-ath5k
* opkg_install_cmd: Cannot install package kmod-net-ath5k.