AT91RM9200 or some AT91SAM9 RTC

modulename: rtc-at91rm9200.ko

configname: CONFIG_RTC_DRV_AT91RM9200

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Device Tree and Open Firmware support
└─>AT91RM9200 or some AT91SAM9 RTC
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Driver for the internal RTC (Realtime Clock) module found on
Atmel AT91RM9200's and some AT91SAM9 chips. On AT91SAM9 chips
this is powered by the backup power supply.

source code:
depends
CONFIG_OF
CONFIG_RTC_CLASS
CONFIG_ARCH_AT91 or CONFIG_COMPILE_TEST