[PATCH 1/3] ARM: OMAP2+: 32k-counter: Use hwmod lookup to check presence of 32k timer

[Shilimkar, Santosh]

On Sat, Mar 31, 2012 at 2:09 PM, Ming Lei <tom.leiming at gmail.com> wrote:
> On Sat, Mar 31, 2012 at 2:30 PM, Shilimkar, Santosh
>> Since you need to recompile the kernel, you can very much tweak the
>> clocksource to use GPTIMER with sysl clock. Support for that is still
>> in place.
>
> With current kernel, running 'make menuconfig' can do it, but after applying
> Hiremath's patch[1], I have to edit the source code manually to get it, so looks
> this kind of tweaking is not friendly enough, :-(
>
It's not friendly but doable. But above can be supported I guess.

Since you are talking about doing menuconfig
and rebuilding kernel so what can be done is when one disable CPUIDLE
and PM, one can disabled 32K source as well. And then 32K clocksource
init should fail and fallback on gptimer clock source.

Vaibhav,
Can you update your patch to support above. The patch which I
did was doing exactly that but was not using hwmod. The problem with your
patch is synctimer hwmod lookup on OMAP will never fail if the hwmod
entry is supported.

So you might better use failure case of omap_init_clocksource_32k() for
fall back on gptimer source as I tried in my patch. That should support
the usage mentioned by Ming Lie

Regards
Santosh