linux-kernel - RE: [PATCH RFT] regulator: tps65217: Convert to regulator_[is_enabled|get_voltage_sel]

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Date:	Mon, 18 Jun 2012 12:56:40 +0000
From:	"AnilKumar, Chimata" <anilkumar@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"axel.lin@...il.com" <axel.lin@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Girdwood, Liam" <lrg@...com>, "Nori, Sekhar" <nsekhar@...com>
Subject: RE: [PATCH RFT] regulator: tps65217: Convert to
 regulator_[is_enabled|get_voltage_sel]_regmap

On Mon, Jun 18, 2012 at 18:15:14, Mark Brown wrote:
> On Mon, Jun 18, 2012 at 12:39:38PM +0000, AnilKumar, Chimata wrote:
> 
> > +	if (config->regmap)
> > +		rdev->regmap = config->regmap;
> > +	else
> > +		rdev->regmap = dev_get_regmap(dev->parent, NULL);
> 
> No, this would be broken.  We're specifically using the device we got
> passed in.  In this case the fact that the regmap is on the MFD means
> that the driver does need to explicitly set the regmap.  Or we should
> have this be a multi-stage series of checks:
> 
> 	if (config->regmap)
> 		rdev->regmap = config->regmap;
> 	else if (dev_get_regmap(dev, NULL))
> 		rdev->regmap = dev_get_regmap(dev, NULL);
> 	else if (dev->parent)
> 		rdev->regmap = dev_get_regmap(dev->parent, NULL);
> 
> which should cover the MFD case if there's no regmap on the child
> without having to go through all the drivers doing it by hand.
> 

I missed out !regmap case.

I think it is better to set in regulator it-self instead of these checks + calls,
this adds extra burden. So, regmap pointer set should be added if we are adding
regulator_[is_enabled|get_voltage_sel]_regmap API support to the driver.

Regards
AnilKumar
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