Chrome OS EC RTC driver

modulename: rtc-cros-ec.ko

configname: CONFIG_RTC_DRV_CROS_EC

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Chrome OS EC RTC driver
In linux kernel since version 4.2 (release Date: 2015-08-30)  
If you say yes here you will get support for the
Chrome OS Embedded Controller's RTC.

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

source code:
drivers/rtc/rtc-cros-ec.c