linux-kernel - RE: [PATCH V2 2/2] TPS65217: Add tps65217 regulator driver

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Message-ID: <331ABD5ECB02734CA317220B2BBEABC104023C@DBDE01.ent.ti.com>
Date:	Tue, 3 Jan 2012 06:16:18 +0000
From:	"AnilKumar, Chimata" <anilkumar@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"Girdwood, Liam" <lrg@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>
Subject: RE: [PATCH V2 2/2] TPS65217: Add tps65217 regulator driver

Hi Mark,

On Mon, Jan 02, 2012 at 18:46:48, Mark Brown wrote:
> On Mon, Jan 02, 2012 at 06:18:42PM +0530, AnilKumar Ch wrote:
> > This patch adds tps65217 PMIC as a regulator
> 
> Use subject lines appropriate for the subsystem you're submitting
> against.
> 
> > +config REGULATOR_TPS65217
> > +	tristate "TI TPS65217 Power regulators"
> > +	depends on (I2C && MFD_TPS65217)
> 
> Should only depend on the MFD, there's no direct I2C usage.

Agree, removed I2C

> 
> > +static unsigned int tps65217_vsel_to_uv_range0(unsigned int vsel)
> > +{
> > +	unsigned int uV = 0;
> > +
> > +	if (vsel <= 24)
> > +		uV = ((vsel * 25000) + 900000);
> > +	else if (vsel > 24 && vsel <= 52)
> > +		uV = (((vsel - 24) * 50000) + 1500000);
> > +	else if (vsel > 52 && vsel <= 56)
> > +		uV = (((vsel - 52) * 100000) + 2900000);
> 
> No need for the > checks as this is already taken care of by being in
> the else clause.

Changed

> 
> > +static unsigned int tps65217_vsel_to_uv_range2(unsigned int vsel)
> > +{
> > +	unsigned int uV = 0;
> > +
> > +	if (vsel <= 8)
> > +		uV = ((vsel * 50000) + 1500000);
> > +	else if (vsel > 9 && vsel <= 13)
> > +		uV = (((vsel - 8) * 100000) + 1900000);
> > +	else if (vsel > 13)
> > +		uV = (((vsel - 13) * 50000) + 2400000);
> > +
> > +	return uV;
> 
> In all of these functions there ought to be a check to make sure vsel
> isn't out of range and return an error if it is.

Added error checks as well.

> 
> > +static int tps65217_pmic_set_bits(struct tps65217 *tps, unsigned int reg,
> > +		unsigned int mask, unsigned int val, unsigned int level)
> > +{
> 
> To repeat what I said when reviewing the previous version of the patch
> things like this shouldn't be open coded in individual function drivers,
> they should be in the MFD driver.  There is *nothing* PMIC specific
> about register access.
> 
> I've stopped reading at this point.
> 

Mark sorry about this, password protected writes/update bits are required
only for regulator so I put it in regulator driver. I got your point, will
be moved to MFD driver.

Thanks for your patience here.

Regards,
AnilKumar
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