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:

quoted

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.