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

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Message-Id: <201306152216.14252.heiko@sntech.de>
Date:	Sat, 15 Jun 2013 22:16:13 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"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

Am Samstag, 15. Juni 2013, 21:56:05 schrieb Linus Walleij:
> On Fri, Jun 14, 2013 at 12:39 AM, Laurent Pinchart
> 
> <laurent.pinchart@...asonboard.com> wrote:
> >         mmcif_pins: mmcif {
> >         
> >                 mux {
> >                 
> >                         renesas,groups = "mmc0_data8_0", "mmc0_ctrl_0";
> >                         renesas,function = "mmc0";
> >                 
> >                 };
> >                 cfg {
> >                 
> >                         renesas,groups = "mmc0_data8_0";
> >                         renesas,pins = "PORT279";
> >                         bias-pull-up = <1>;
> 
> If I understood your code correctly that last statement can *optionally*
> be written like just:
> 
>  bias-pull-up;
> 
> Without the parameter?
> 
> I think that Heiko's implementation does this anyway.

Yep, with the fixes-series from yesterday the bias-pull-* now have a better 
default value of <1>.

so you can do
	bias-pull-up;
which is then identical to the
	bias-pull-up = <1>;
above (both are valid of course).


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.


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