Hi Mike,
> + *
> + * @recalc_rate      Recalculate the rate of this clock, by quering hardware
> + *           and/or the clock's parent. It is up to the caller to insure
> + *           that the prepare_mutex is held across this call.  Returns the
> + *           calculated rate.  Optional, but recommended - if this op is not
> + *           set then clock rate will be initialized to 0.
I'm still concerned, if it's NULL, why don't just retrun parent's rate if it 
has? 
 
Thanks
Richard

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