Alpha PC-style CMOS

modulename: rtc.ko

configname: CONFIG_RTC_DRV_ALPHA

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Alpha PC-style CMOS
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Direct support for the real-time clock found on every Alpha
system, specifically MC146818 compatibles. If in doubt, say Y.

source code:
arch/alpha/kernel/rtc.c