linux-kernel - Re: [PATCH 2/4] Input: pmic8xxx-keypad - use regmap

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Message-ID: <20141027160641.GB7594@dtor-ws>
Date:	Mon, 27 Oct 2014 09:06:41 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: [PATCH 2/4] Input: pmic8xxx-keypad - use regmap_field for
 register access

On Mon, Oct 27, 2014 at 05:30:41PM +0200, Ivan T. Ivanov wrote:
> 
> Hi Dmitry, 
> 
> On Mon, 2014-10-13 at 16:02 +0200, Mark Brown wrote:
> > On Wed, Oct 08, 2014 at 01:32:33PM -0700, Dmitry Torokhov wrote:
> > > On Wed, Oct 08, 2014 at 09:04:26PM +0100, Mark Brown wrote:
> > > > On Wed, Oct 08, 2014 at 11:20:58AM -0700, Stephen Boyd wrote:
> > 
> > > > > Srini/Mark, any reason why the regmap_field structure is opaque?
> > 
> > > > So you can't peer into it and rely on the contents.  I can see it being
> > > > useful to add a bulk allocator.
> > 
> > > And then one have to define offsets in an array and use awkward syntax
> > > to access individual fields. Can we just reply on reviews/documentation
> > > for users to not do wrong thing?
> > 
> > I have very little confidence in users not doing awful things to be
> > honest, this is the sort of API where the users are just random things
> > all over the kernel so this sort of thing tends to be found after the
> > fact.  I get a lot of these in drivers that just got thrown over the
> > wall so nobody really knows what things are doing when you do find them.
> > 
> > If the standard allocators aren't doing a good job (I've not checked)
> > I'd much rather handle this inside the API if we can.
> > 
> 
> Is there something that I can help here or patches are good as they are? :-)

Well, as far as I can see Bjorn (in the other thread) has some
objections on merging these devices together, so I ma just waiting for
you settle this issue.

I see he's not on this therad so let's CC him.

For the record I ma still not happy that we need to dynamically allocate
all these regmap fields.

Thanks.

-- 
Dmitry
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