NXP PCF2127

modulename: rtc-pcf2127.ko

configname: CONFIG_RTC_DRV_PCF2127

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>I2C support
└─>NXP PCF2127
In linux kernel since version 3.10 (release Date: 2013-06-30)  
If you say yes here you get support for the NXP PCF2127/29 RTC
chips.

This driver can also be built as a module. If so, the module
will be called rtc-pcf2127.

source code:
drivers/rtc/rtc-pcf2127.c