[PATCH v3 7/7] i2c: bcm2835: Add support for dynamic clock

Noralf Trønnes noralf at tronnes.org
Wed Sep 28 15:10:37 PDT 2016

Den 28.09.2016 23:24, skrev Eric Anholt:
> Noralf Trønnes <noralf at tronnes.org> writes:
>> Support a dynamic clock by reading the frequency and setting the
>> divisor in the transfer function instead of during probe.
> Is this fixing some particular case you could note in the commit
> message?  As is, it makes me think that we should be using a notifier
> for when the parent clock (that's the one I assume you're talking about
> being dynamic) changes.  But maybe you're working around a variable VPU
> clock being set by the firmware, because we don't have a notifier for
> it?
> I'm a bit worried because I think this is going to be pretty expensive
> to be doing per transfer.

Actually I thought that this was a known problem, but trying to track
it down now, I can't find anything definitive. I don't have any tool
to look at the bus signals, so I couldn't actually test it.
Sorry about this, we can just drop this patch.


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