Hi Geert,
On Friday, March 17, 2017, Geert Uytterhoeven wrote:
> > On Friday, March 17, 2017, Geert Uytterhoeven wrote:
> >> On Thu, Mar 16, 2017 at 6:51 PM, Chris Brandt
> >> <chris.brandt@xxxxxxxxxxx>
> >> wrote:
> >> > +- clocks: the clock source for the RTC controller.
> >>
> >> The datasheet mentions 3 possible clock sources?
> >
> > There is the clock source that does the counting (RTC_X1, RTC_X3, XTAL),
> and then a clock source that runs the register interface (run off of the
> p0 clock). So I just need to turn on the p0 clock so I can get at the
> registers. Note that if you do a hard reset with a RESET button, and all
> the registers in the chip go back to their POR state, the counter still
> counts off of the 32KHz XTAL even though the "peripheral clock" is stopped
> (which just means you can't get to the registers).
> >
> > In reality, you have to assume the RTC counting source has already been
> set up by u-boot, or from a past reboot, so I don't do any of that select
> configuration at all.
>
> it would still be good to have phandles to the external clock sources as
> well, as that describes the hardware topology.
I'm confused, you mean make new clocks node for RTC_X1 (fixed at 32.768kHZ) and
RTC_X3 (fixed at 4MHz), but then not really do anything with then? (the driver
doesn't need them)
Chris
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