linux-kernel - Re: [PATCH V1] TPS62360: Add tps62360 regulator driver

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Message-ID: <20120108165819.GB29065@opensource.wolfsonmicro.com>
Date:	Sun, 8 Jan 2012 08:58:24 -0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Laxman Dewangan <ldewangan.com@...dia.com>,
	"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH V1] TPS62360: Add tps62360 regulator driver

On Sun, Jan 08, 2012 at 01:12:47PM +0530, Laxman Dewangan wrote:

> > Taking multiple different regulator_init_data is definitely not what we
> > want, there's a whole bunch of information in there, not just the
> > voltages.  You should just use platform data to specify the GPIOs (and
> > a set of voltages if you go with that approach).

> How do you pass the voltages along with gpios? If I understand correctly
> then it may be wither in range form or discrete form.
> Like in range form 500-700 for VSEL:00, 710-800 VSEL:01 etc.
> In discrete form VSEL00:500, 540, 550..
> For, VSEL01, VSEL00:510, 900,

Why would you have ranges?  If you've set the VSEL pins to a particular
value I'd expect the chip to produce whatever voltage is programmed for
that VSEL.

> In range form, the disadvantages is that, most of time, the voltage
> requirement is surrounding operating voltage and so it will use only
> one combination of VSEL in most of time and will not get the benefit.
> The discrete form have long list of voltage and filling table is pain.
> Also need to maintain the big list of lookuptable to select voltage
> configuration register.

You only have four possible VSELs so I don't see a concern there.
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