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

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Message-ID: <96C9D994977DD0439FB6D3FE3B13DD907DBDABA9B6@BGMAIL01.nvidia.com>
Date:	Mon, 9 Jan 2012 13:03:06 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.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 Monday, January 09, 2012 12:41 PM, Mark Brown wrote
> > In my design, the voltage vary from 900mV to the 1300mV in increment of
> > 50mV. In this case, the voltage change request is 900, 950, 1000, 1050,
> > 1100, 1150, 1200, 1250, 1300.
> > I would like to have entry like
> > 900-950->vsel0
> > 950-1000>vsel1,
> > 1000-1050->vsel2
> > 1050-1100->vsel3
> > 1100-1150->vsel0
> > 1150-1200->vsel1
> > 1200-1250->vsel2
> > 1250->1300->vsel3
> 
> 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?

> 
> > Based on voltage increment requirements for a given application, this
> > table can be tune more. Now if client request for voltage setting for
> > range of 1000-1050, I will select the VSET1 for configuration, similarly
> > for 1100-1150, VSET0 will be the configuration register.
> 
> This just seems like it makes the driver configuration much more
> complex and restricts the ability of the system to adapt itself to
> what's happening at runtime.
> 
> 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?
I want to have around 10 different voltages at output.

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