linux-kernel - Re: [RFC Patch] gpio: add GPIO hogging mechanism

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Date:	Fri, 14 Nov 2014 11:22:44 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Benoit Parrot <bparrot@...com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pantelis Antoniou <panto@...oniou-consulting.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>
Subject: Re: [RFC Patch] gpio: add GPIO hogging mechanism

On Fri, Nov 14, 2014 at 10:19:47AM +0100, Linus Walleij wrote:
> On Wed, Oct 29, 2014 at 8:09 AM, Alexandre Courbot <gnurou@...il.com> wrote:
> > On Wed, Oct 22, 2014 at 5:09 AM, Benoit Parrot <bparrot@...com> wrote:
> 
> > +               line_b: line_b {
> > +                       line_b {
> > +                               gpios = <6 0>;
> > +                               output-low;
> > +                               line-name = "foo-bar-gpio";
> > +                       };
> > +               };
> >
> (...)
> >
> > I wonder if such usage of child nodes could not interfere with GPIO
> > drivers (existing or to be) that need to use child nodes for other
> > purposes. Right now there is no way to distinguish a hog node from a
> > node that serves another purpose, and that might become a problem in
> > the future.
> 
> Yes, so I have suggested a hog-something; keyword in there.
> 
> As long as the children don't have any compatible-strings we can
> decide pretty much how they should be handled internally.
> 
> Are there custom drivers with child nodes inside the main chip
> today?

o/

Our pinctrl driver is also our GPIO driver, so they both share the
same node.

Our pinctrl definitions are there.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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