linux-kernel - Re: [PATCH v2 1/2] pmbus: add regulator support

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Date:	Fri, 22 Aug 2014 19:31:12 -0500
From:	atull <atull@...nsource.altera.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<linux@...ck-us.net>, <jdelvare@...e.de>,
	<lm-sensors@...sensors.org>, <lgirdwood@...il.com>,
	<linux-kernel@...r.kernel.org>, <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>, <yvanderv@...nsource.altera.com>
Subject: Re: [PATCH v2 1/2] pmbus: add regulator support

On Fri, 22 Aug 2014, Mark Brown wrote:

> On Fri, Aug 22, 2014 at 04:11:33PM -0500, atull@...nsource.altera.com wrote:
> 
> > +	if (pdata && pdata->reg_init_data) {
> > +		config.init_data = pdata->reg_init_data;
> > +	} else {
> > +		config.init_data = of_get_regulator_init_data(dev, np);
> > +		if (!config.init_data)
> > +			return -ENOMEM;
> > +	}
> 
> It should be fine to start with no init data - just let the regulator
> core worry about it.  This will allow users to read back the state even
> if they can't change anything which is useful for system bringup or
> general debugging.
> 

of_get_regulator_init_data() will only have an error if it cannot alloc 
the regulator_init_data struct.  That's why I did -ENOMEM.  If there
is no platform data and nothing about the regulator in the device tree, we 
should end up with a zeroed out regulator_init_data.

Thanks for the review.

Alan
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