linux-kernel - Re: [PATCH 10/53] Input: atmel_mxt_ts - Add memory access interface via sysfs

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Date:	Thu, 6 Jun 2013 10:48:22 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Nick Dyer <nick.dyer@...ev.co.uk>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan.Bowens@...el.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, pmeerw@...erw.net,
	bleung@...omium.org, olofj@...omium.org
Subject: Re: [PATCH 10/53] Input: atmel_mxt_ts - Add memory access interface
 via sysfs

On Wed, Jun 05, 2013 at 02:07:15PM -0700, Dmitry Torokhov wrote:
> On Wed, Jun 05, 2013 at 09:31:39PM +0100, Nick Dyer wrote:

> > It's partly path dependence - it was implemented like this because regmap
> > wasn't in mainline at the point when I wrote it. Having a dependency on
> > regmap would now be a API break complicating support of customers using
> > older kernels than mainline. I would also have to update a bunch of

> This was never a good argument for introducing an interface into the
> kernel.

Indeed, and regmap is very easy to backport - it demands little from the
rest of the kernel and most of that is bus specific so you can pretty
much just copy it into an older kernel.

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