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8168 usind davinci -rtc to do timer

Hi, 

    Recently, I am using the demo of dvr-rdk4.0 in DM8168.  I want to use a rtc as a timer (periodic_IRQ) in my case.  but I find that it used omap-rtc in primitive  kernel, the omap-rtc don't realize the function of rtc_irq_set_freq.   It has the function of davinci_rtc_irq_set_freq in rtc-davinci.c,   So,  Whether I can use rtc-davinci to do periodic_IRQ, and how to I complie the davinic-rtc in kernel;

Thanks .