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

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Message-ID: <20121126113230.GT5384@localhost.localdomain>
Date:	Mon, 26 Nov 2012 17:02:30 +0530
From:	Shiraz Hashim <shiraz.hashim@...com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	<linus.walleij@...aro.org>, Viresh Kumar <viresh.kumar@...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 Mon, Nov 26, 2012 at 11:28:23AM +0000, Lee Jones wrote:
> 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?

Yes, but I think it is only for managing the SoC and its pads.

--
regards
Shiraz
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