| Date | Fri, 17 Aug 2012 15:51:17 +0530 | From | Santosh Shilimkar <> | Subject | Re: [PATCH v2 28/31] arm64: Generic timers support |
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On Tuesday 14 August 2012 11:22 PM, Catalin Marinas wrote: > From: Marc Zyngier<marc.zyngier@arm.com> > > This patch adds support for the ARM generic timers with A64 instructions > for accessing the timer registers. It uses the physical counter as the > clock source and the virtual counter as sched_clock. > > The timer frequency can be specified via DT or read from the CNTFRQ_EL0 > register. The physical counter is also accessible from user space > allowing fast gettimeofday() implementation. > > Signed-off-by: Marc Zyngier<marc.zyngier@arm.com> > Signed-off-by: Will Deacon<will.deacon@arm.com> > Signed-off-by: Catalin Marinas<catalin.marinas@arm.com> > ---
[..]
> diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c > new file mode 100644 > index 0000000..05c898c > --- /dev/null > +++ b/drivers/clocksource/arm_generic.c
[..]
> + > +static void __cpuinit arch_timer_setup(struct clock_event_device *clk) > +{ > + /* Let's make sure the timer is off before doing anything else */ > + arch_timer_stop(); > + > + clk->features = CLOCK_EVT_FEAT_ONESHOT; Are these CPU timers wakeup capable or we need the wakeup capable broadcast timer for low power wakeups ? In that case C3STOP would be needed here.
Regards santosh
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