linux-kernel - Re: [PATCH 05/12] GPIO: gpio-generic: Add label to platform data

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Date:	Tue, 11 Feb 2014 17:20:56 +0000
From:	Pawel Moll <Pawel.Moll@....com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	"arm@...nel.org" <arm@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 05/12] GPIO: gpio-generic: Add label to platform data

On Tue, 2014-02-11 at 17:17 +0000, Lee Jones wrote:
> > When registering more than one platform device, it is
> > useful to set the gpio chip label in the platform data.
> >
> > Cc: Linus Walleij <linus.walleij@...aro.org>
> > Cc: Alexandre Courbot <gnurou@...il.com>
> > Cc: Samuel Ortiz <sameo@...ux.intel.com>
> > Cc: Lee Jones <lee.jones@...aro.org>
> > Signed-off-by: Pawel Moll <pawel.moll@....com>
> > ---
> > This patch has been already merged by Linux; it has been included
> > for completeness only.
> >
> >  drivers/gpio/gpio-generic.c     | 2 ++
> >  include/linux/basic_mmio_gpio.h | 1 +
> >  2 files changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
> > index d2196bf..8c778af 100644
> > --- a/drivers/gpio/gpio-generic.c
> > +++ b/drivers/gpio/gpio-generic.c
> > @@ -531,6 +531,8 @@ static int bgpio_pdev_probe(struct platform_device *pdev)
> >             return err;
> >
> >     if (pdata) {
> > +           if (pdata->label)
>
> Why is this check necessary?
>
> > +                   bgc->gc.label = pdata->label;

Because bgc->gc.label is initialized to a default value in bgpio_init()
and I don't want to override it with NULL if there is no label passed in
the platform data.

Pawel

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