linux-kernel - Re: [Patch v5 2/2] gpio: Document GPIO hogging mechanism

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Date:	Mon, 12 Jan 2015 10:39:02 -0600
From:	Benoit Parrot <bparrot@...com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>
CC:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [Patch v5 2/2] gpio: Document GPIO hogging mechanism

Linus Walleij <linus.walleij@...aro.org> wrote on Mon [2015-Jan-12 11:20:14 +0100]:
> On Fri, Dec 19, 2014 at 9:07 PM, Benoit Parrot <bparrot@...com> wrote:
> 
> > Add GPIO hogging documentation to gpio.txt
> >
> > Signed-off-by: Benoit Parrot <bparrot@...com>
> > Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
> 
> This is starting to look good ...
> 
> > +               line_b {
> > +                       gpio-hog;
> > +                       gpios = <6 0>;
> > +                       state = "output-low";
> 
> I don't like the state string.
> 
> Instead have boolean properties for all states.
> 
> line_b {
>     gpio-hog;
>     gpios = <6 0>;
>     output-low;
>     line-name = "foo-bar-gpio";
> }
> 
> Then use of_property_read_bool() in the code to check which
> state is to be selected intially. You can check that no mutually
> exclusive state are selected, I don't like that an arbitrary string
> select the state like that, if we do it that way an enumerator would
> be better, I prefer bools.

I am sorry but that is how it was originally in the first patch.
Alexandre's review comment suggested this method in [1] and [2] (below).

Alexandre, any comments?

[1] http://marc.info/?l=linux-gpio&m=141456662426151&w=2

[2] http://marc.info/?l=linux-gpio&m=141715982424744&w=2

> 
> Yours,
> Linus Walleij
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