CONFIG_ATMEL_PIT (not configurable)

modulename: timer-atmel-pit.ko

configname: CONFIG_ATMEL_PIT

Linux Kernel Configuration
└─>Device Drivers
└─>Clock Source drivers
└─>ATMEL_PIT
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/clocksource/timer-atmel-pit.c
selects
CONFIG_TIMER_OF