linux-kernel - Re: [RFC PATCH v3 3/5] pinctrl: imx: add pinctrl imx driver

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Message-ID: <20120109021702.GV2414@b20223-02.ap.freescale.net>
Date:	Mon, 9 Jan 2012 10:17:03 +0800
From:	Richard Zhao <richard.zhao@...escale.com>
To:	Shawn Guo <shawn.guo@...aro.org>
CC:	Richard Zhao <richard.zhao@...aro.org>,
	<linus.walleij@...ricsson.com>, <s.hauer@...gutronix.de>,
	<w.sang@...gutronix.de>, <rob.herring@...xeda.com>,
	<linux-kernel@...r.kernel.org>, <grant.likely@...retlab.ca>,
	<shawn.guo@...escale.com>, <kernel@...gutronix.de>,
	<cjb@...top.org>, Dong Aisheng <b29396@...escale.com>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 3/5] pinctrl: imx: add pinctrl imx driver

On Mon, Jan 09, 2012 at 10:08:51AM +0800, Shawn Guo wrote:
> On Sun, Jan 08, 2012 at 09:05:44PM +0800, Richard Zhao wrote:
> > > +enum imx_imx53_pinctrl_pads {
> > > +	MX53_GPIO_19 = 0,
> > > +	MX53_KEY_COL0 = 1,
> > > +	MX53_KEY_ROW0 = 2,
> > > +	MX53_KEY_COL1 = 3,
> > > +	MX53_KEY_ROW1 = 4,
> > > +	MX53_KEY_COL2 = 5,
> > > +	MX53_KEY_ROW2 = 6,
> > ...
> > Why not describe it in dts and make this file generic for imx?
> > One node for one pad,
> 
> Doing this will bloat the device tree dramatically.  Actually I had
> a patch doing so before the pinctrl subsystem was born, but it
> concerned Grant a lot for that reason and thus died.
are you against describing pad in dts or one node per pad?
one node per pad is just a tip to extend pad property, to support
other features (pinconf in your word).
> 
> > it'll be easy to extend pad properties. You know
> > the pad may set pull up/down, open drain, drive strenth, daisy chain etc.
> > The features have to be supported, to make your model usefull.
> > 
> As Aisheng mentioned, the pinconf support will be added later.
I expect pinconf come together, and get a ready-to-use patch series.

Thanks
Richard
> 
> -- 
> Regards,
> Shawn
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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