linux-kernel - Re: [PATCH 2/2] regulator: max8660: Add error message for missing regulator data

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Message-ID: <20150324164011.GL28604@pengutronix.de>
Date:	Tue, 24 Mar 2015 17:40:11 +0100
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] regulator: max8660: Add error message for missing
 regulator data

On Tue, Mar 24, 2015 at 09:08:57AM -0700, Mark Brown wrote:
> On Tue, Mar 24, 2015 at 01:08:03PM +0100, Markus Pargmann wrote:
> > The driver probe fails when there is a subdevice without platform_data.
> > Add a error message so it is clear what failed.
> 
> ...
> 
> >  	for (i = 0; i < pdata->num_subdevs; i++) {
> > -		if (!pdata->subdevs[i].platform_data)
> > +		if (!pdata->subdevs[i].platform_data) {
> > +			dev_err(dev, "No data for %d regulator\n", i);
> >  			return -EINVAL;
> > +		}
> 
> Why is the platform data mandatory?  In general the goal is that a
> regulator driver should be able to probe with no platform data.

subdevs[]->platform_data is a struct regulator_init_data which has to
exist so we can register the regulator later.

Best Regards,

Markus

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