High-resolution timers not supported when using smp_twd on Cortex A9

[Russell King - ARM Linux]

On Mon, May 04, 2015 at 10:02:40AM +0200, Mason wrote:
> (The system's clocksource is a 27 MHz 32-bit counter.)
> 
> If I remove the CLOCK_EVT_FEAT_C3STOP flag, then hrtimers are enabled,
> but I assume I would then run into problems in low-power mode, going by
> Russell's commit message.

It seems that you've done the research, and judging from the question
you ask below, you already know the answer:

> Do I have to use a platform-specific clockevent source if I want
> high-resolution timers on the system?

Yes - because the TWD stops in low power modes, which makes it unsuitable
as a high-resolution timer.  These kinds of issues are annoying, but it's
the way things are.

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