PXA27x/PXA3xx

modulename: rtc-pxa.ko

configname: CONFIG_RTC_DRV_PXA

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>PXA27x/PXA3xx
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
If you say Y here you will get access to the real time clock
built into your PXA27x or PXA3xx CPU. This RTC is actually 2 RTCs
consisting of an SA1100 compatible RTC and the extended PXA RTC.

This RTC driver uses PXA RTC registers available since pxa27x
series (RDxR, RYxR) instead of legacy RCNR, RTAR.

source code: