Re: [PATCH 1/2] regmap: only call custom reg_update_bits() if reg is marked volatile

[David Miller <davem@davemloft.net>]

From: Mark Brown <broonie@kernel.org>
Date: Mon, 5 Oct 2015 15:57:22 +0100

> On Mon, Oct 05, 2015 at 09:29:31AM -0400, jon@ringle.org wrote:
>> From: Jon Ringle <jringle@gridpoint.com>
>> 
>> The only time that it makes sense to call a custom provided reg_update_bits
>> function, is the register being updated is one that has volatile bits.
>> Otherwise, the normal read/modify/write cycle (where the read is likely to
>> be free from the cache) will do just fine. This should keep the reg cache
>> intact, since volatile registers won't get cached anyway.
> 
> Dave, to be clear please do *not* apply this patch at least for the time
> being - I've not reviewed it or the one from Thursday that you applied
> this morning.

It's applied, it's pushed out to my tree, and therefore this will need to
be fixed up with a relative patch of some sort.

What you don't seem to understand is that my GIT tree is never rebased
or mangled because many people depend upon it.  So once a patch is
applied, that commit lives on forever.