Messages in this thread | | | Date | Mon, 8 Feb 2016 15:06:14 +0100 | From | Boris Brezillon <> | Subject | Re: [PATCH v1] clocksource: atmel-pit: register as a sched_clock |
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+ Alexandre
Hi Daniel,
On Mon, 8 Feb 2016 14:33:04 +0100 Daniel Lezcano <daniel.lezcano@linaro.org> wrote:
> On 02/04/2016 06:21 PM, Romain Izard wrote: > > Register the counter of the Periodic Interval Timer as a possible source > > for sched_clock. This provides a better precision than the jiffies-based > > default. > > > > Signed-off-by: Romain Izard <romain.izard.pro@gmail.com> > > Nicolas, Boris, > > Are you ok with this patch ?
Not sure yet :). On most platforms we are also declaring a clocksource based on the TCB IP, and this one provides a better precision than the PIT clocksource. What happens if the PIT is de-activated while it's still supposed to provide the sched_clock(). Is there a way to flag the clocksource as still needed so that the core does not shut it down by when the TCB clocksource comes in.
Best Regards,
Boris
-- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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