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

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Date:	Fri, 23 Nov 2012 12:14:13 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	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

> >> -     stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
> >
> > Why have you deleted this?
> >
> >> +
> >> +     if (pdata) {
> >> +             stmpe_gpio->norequest_mask = pdata->norequest_mask;
> >> +             stmpe_gpio->chip.base = pdata->gpio_base;
> >
> > Then added this?
> >
> >> +     } else {
> >> +             stmpe_gpio->chip.base = -1;
> >
> > And this?
> 
> To group all non-DT assignments in a single if block, instead of two.

That assignment has nothing to do with DT.

> > Just leave the top line in and it saves you lots of complecations.
> 
> Sorry, Couldn't get this one.

I'm saying, just leave it where it is.

> >> +             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?

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