RTC class

modulename: rtc-core.ko

configname: CONFIG_RTC_CLASS

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>RTC class
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Generic RTC class support. If you say yes here, you will
be allowed to plug one or more RTCs to your system. You will
probably want to enable one or more of the interfaces below.

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

source code:
selects
CONFIG_RTC_LIB

depends
CONFIG_EXPERIMENTAL or  NOT CONFIG_S390 |
NOT | CONFIG_UML

is selected by
CONFIG_RTC_DRV_SNVS