linux-kernel - Re: [PATCH] gpio: stmpe: Add DT support for stmpe gpio

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Message-ID: <20121126112823.GI12782@gmail.com>
Date:	Mon, 26 Nov 2012 11:28:23 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Shiraz Hashim <shiraz.hashim@...com>, linus.walleij@...aro.org
Cc:	Viresh Kumar <viresh.kumar@...aro.org>, linus.walleij@...aro.org,
	grant.likely@...retlab.ca, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, spear-devel@...t.st.com,
	Vipul Kumar Samar <vipulkumar.samar@...com>
Subject: Re: [PATCH] gpio: stmpe: Add DT support for stmpe gpio

On Fri, 23 Nov 2012, Shiraz Hashim wrote:

> On Fri, Nov 23, 2012 at 12:14:13PM +0000, Lee Jones wrote:
> > > >> +             if (np)
> > > >> +                     of_property_read_u32(np, "st,norequest-mask",
> > > >> +                                     &pdata->norequest_mask);
> > > >
> > > > Can you explain to me what this does?
> > > 
> > > You mean pdata->norequest_mask?  It marks few gpios as unusable.
> > > Because these pads might be used by other blocks of stmpe.
> > 
> > I'm not sure if that should be set with DT or not.
> > 
> > Second opinion anyone?
> 
> This is a board dependent parameter which just informs gpio driver
> about pins, which must not be requested. It may happen for a stmpe
> variant where such gpio pins are multiplexed with some other
> function.
> 
> Hence it must be part of DT itself.

Doesn't pinctrl normally handle this kind of stuff?

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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