default or selected kernelversion does not have config value CONFIG_ATCPIT100_TIMER.
Result is shown for kernelversion 6.9.9
ATCPIT100 timer driver
modulename: timer-atcpit100.ko
configname: CONFIG_ATCPIT100_TIMER
Linux Kernel Configuration
└─>Device Drivers
└─>Clock Source drivers
└─>ATCPIT100 timer driver
In linux kernel since version 4.2 (release Date: 2015-08-30)
This option enables support for the Andestech ATCPIT100 timers.