Re: [PATCH v2 2/6] rtc: omap: Add external clock enabling support

[Keerthy <a0393675-l0cyMroinI0@public.gmane.org>]

On Friday 14 August 2015 01:47 AM, Paul Walmsley wrote:
> Hi guys
>
> On Wed, 12 Aug 2015, Alexandre Belloni wrote:
>
>> On 13/08/2015 at 00:38:50 +0530, Keerthy wrote :
>>> The intent here is to switch to a higher precision clock which is the
>>> internal clock when available.
>>>
>>> Alexandre,
>>>
>>> Is dynamic switching preferred over sticking  to external clock always if
>>> present?
>>
>> I'd say that I don't really care. I'd say the best would be to make a
>> decision based on clock-accuracy but maybe that is an information you
>> don't have yet. Anyway, this could be added at a later date.
>
> Either the clock mux logic is glitchless, in which case the RTC is likely
> to lose at least 31 microseconds per switch; or it's not glitchless, in
> which case it's unsafe to switch the RTC clock source while the clock
> isn't gated.  Keerthy, before submitting this patch for merging, I'd
> suggest consulting your hardware folks to figure out which case it is.

Paul,

Thanks. Yes so i am doing the static way first. Keeping external clock 
always if available. Switching dynamically can be done later with more 
clarifications.

Thanks,
Keerthy

>
>
> - Paul
>
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