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

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Date:	Sun, 8 Jan 2012 23:39:00 -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 Mon, Jan 09, 2012 at 01:03:06PM +0530, Laxman Dewangan wrote:
> > On Monday, January 09, 2012 12:41 PM, Mark Brown wrote

> > Why?  I'm not sure I understand this.  You're asking the regulator to
> > output ranges not voltages and you're setting multiple overlapping
> > ranges for each VSEL.

> If I fix the voltage with each VSEL then only 4 voltages will be
> possible but I want to have more than 4 different output.
> How do I achieve this?

The driver can decide what voltages to set - like I said in a previous
mail it could use something like LRU to decide which slot to use, or
perhaps be clever with the upper end of the range it was given.

> > What I'd expect to see is nothing but the GPIOs and their default state
> > (since sadly we can't read back from output GPIOs with gpiolib) being
> > specified.

> I did not understand it correctly. Can you please elaborate how can we
> pass the voltage with corresponding vsel?

For bootstrapping you can just read the values back.
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