linux-kernel - Re: [RFC] pinctrl: generic: Add DT bindings

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Message-ID: <CACRpkdYi=ekV8okmz68HZ8Ydv9hTrHnHvQh0HYMs5SfURd9mdA@mail.gmail.com>
Date:	Sun, 16 Jun 2013 01:51:32 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	James Hogan <james.hogan@...tec.com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: Re: [RFC] pinctrl: generic: Add DT bindings

On Sun, Jun 16, 2013 at 1:35 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Saturday 15 June 2013 22:16:13 Heiko Stübner wrote:
>> Am Samstag, 15. Juni 2013, 21:56:05 schrieb Linus Walleij:

>> Disable would the be either
>>       bias-disable;
>> or
>>       bias-pull-up = <0>;
>>
>> A driver should probably handle both, as both are valid pinconf options or
>> this.
>
> I feel a bit uneasy about that. Do we really need to support two different
> ways to achieve the same result ?

In this specific case I think yes, but not on all options.

As dicussed earlier this was designed for systems where
you could set the pull-up resistance, like

bias-pull-up = <600000>;

would give 600kOhm pull up.

In most existing systems that is silly, as they can't specify
it, so they should be able to do just:

bias-pull-up;

as that is all they can do. If we have to cut one way, we
should cut the former until such a system appears.

Yours,
Linus Walleij
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