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

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Message-ID: <CACRpkdbO20No0A7ttS=kfMx9qE_MZoZzOtPObHefwnNbixpCeg@mail.gmail.com>
Date:	Fri, 14 Nov 2014 10:19:47 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	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 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?

Yours,
Linus Walleij
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