Abracon ABx80x

modulename: rtc-abx80x.ko

configname: CONFIG_RTC_DRV_ABX80X

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Abracon ABx80x
In linux kernel since version 4.1 (release Date: 2015-06-21)  
If you say yes here you get support for Abracon AB080X and AB180X
families of ultra-low-power battery- and capacitor-backed real-time
clock chips.

This driver can also be built as a module. If so, the module
will be called rtc-abx80x.

source code: