On Thu, 2007-09-20 at 10:52 +1000, Paul Mackerras wrote:

Daniel Walker writes:

quoted

If you switch to the rtc do the shift and mult need to change?

You can't switch; any given CPU chip will have either the RTC or the
timebase but not both.

I think what Daniel is pointing out is that the clocksource read
function isn't the place for the __USE_RTC() conditional. 

It would likely be better instead of the timebase clocksource managing
multiple type of hardware (timebase and RTC), to have a separate simple
RTC clocksource, and then conditionally register one or the other at
init time.

thanks
-john