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

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Date:	Fri, 23 Nov 2012 18:00:48 +0530
From:	Shiraz Hashim <shiraz.hashim@...com>
To:	Lee Jones <lee.jones@...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, 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.

--
regards
Shiraz
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