linux-kernel - RE: [PATCH 02/11] GPIO: DA9052 GPIO module v1

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Date:	Thu, 30 Jun 2011 17:10:31 +0530
From:	Ashish Jangam <Ashish.Jangam@...tcummins.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"jic23@....ac.uk" <jic23@....ac.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dajun <dajun.chen@...semi.com>,
	"grant@...retlab.ca" <grant@...retlab.ca>
Subject: RE: [PATCH 02/11] GPIO: DA9052 GPIO module v1

> -----Original Message-----
> From: Mark Brown [mailto:broonie@...nsource.wolfsonmicro.com]
> Sent: Thursday, June 30, 2011 11:07 AM
> To: Ashish Jangam
> Cc: jic23@....ac.uk; linux-kernel@...r.kernel.org; Dajun; grant@...retlab.ca
> Subject: Re: [PATCH 02/11] GPIO: DA9052 GPIO module v1
> 
> On Wed, Jun 29, 2011 at 07:23:11PM +0530, ashishj3 wrote:
> 
> > DA9052 PMIC has 16 bit GPIO bus for peripheral control.
> >
> > This patch add support for the GPIO pins on the DA9052.
> 
> > +	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
> > +	pdata = gpio->da9052->dev->platform_data;
> > +
> > +	if (pdata == NULL) {
> > +		dev_err(&pdev->dev, "Failed no platform data for GPIO\n");
> > +		ret = -ENOMEM;
> > +		goto err_mem;
> > +	}
> 
> Why insist on platform data?  gpiolib can dynamically allocate a GPIO
> range to the device.
Do you mean to use gpiochip_reserve() in machine file and not to have ngpio 
and base defined in GPIO platform driver but, this will fail the call to gpiochip_add()?
Can you elaborate on it?