Re: [RFC v3 1/3] gpio: dt-bindings: add basic-mmio-gpio bindings

[Christian Lamparter <chunkeey@googlemail.com>]

On Thursday, April 28, 2016 03:20:39 PM Alexandre Courbot wrote:
> On Thu, Apr 28, 2016 at 12:08 AM, Rob Herring <robh+dt@kernel.org> wrote:
> > On Wed, Apr 27, 2016 at 5:15 AM, Christian Lamparter
> > What I meant was convert the drivers, not the dts files to a generic
> > driver. There is no benefit here from a dts perspective. It is driver
> > consolidation that would make all this worthwhile.
> > [...]
> > My other worry about this is next someone will want to add interrupt
> > registers which is probably a majority of GPIO controllers.
> >
> > Of course, I'm sure Linus has an opinion on all of this.
> 
> I'm not Linus, but after a quick look at the drivers mentioned by
> Christian I see little room for improvement (but still some - see
> below). Like Rob mentioned we want the DT's compatible property to
> describe the hardware as precisely as possible. "basic-mmio-gpio" is
> not precise and not backward-compatible. The examples listed by
> Christian are already all using the generic MMIO driver and are thus
> already quite short.
> [...]
> So without touching the DT I think consolidating the bgpio users in a
> fashion similar to what simple-panel does would be worthwhile.
I'm getting ready to update my series with a patch like that. I would
like to consolidate the gpio drivers into a single file. But for the
v4 series at least the parsers are still residing in their original files
(I hoped this would make the transition from the _probe to the parser
less painless but the diff came out pretty much unreadable). 
I think this would be just a matter of what's preferred.