linux-kernel - Re: [PATCH 1/1] Add all TWL4030 regulators to Regulator framework

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Message-ID: <20091119092412.GA4696@codecarver.research.nokia.com>
Date:	Thu, 19 Nov 2009 11:24:12 +0200
From:	"Peter 'p2' De Schrijver" <peter.de-schrijver@...ia.com>
To:	"Keski-Saari Juha.1 (EXT-Teleca/Helsinki)" 
	<ext-juha.1.keski-saari@...ia.com>
Cc:	ext Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Valentin Eduardo (Nokia-D/Helsinki)" <eduardo.valentin@...ia.com>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"dbrownell@...rs.sourceforge.net" <dbrownell@...rs.sourceforge.net>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
	"Hunter Adrian (Nokia-D/Helsinki)" <adrian.hunter@...ia.com>,
	"amit.kucheria@...durent.com" <amit.kucheria@...durent.com>,
	"dtor@...l.ru" <dtor@...l.ru>,
	"Kristo Tero (Nokia-D/Tampere)" <Tero.Kristo@...ia.com>
Subject: Re: [PATCH 1/1] Add all TWL4030 regulators to Regulator framework

On Thu, Nov 19, 2009 at 08:04:08AM +0100, Keski-Saari Juha.1 (EXT-Teleca/Helsinki) wrote:
> ext Mark Brown wrote:
> > On Wed, Nov 18, 2009 at 04:36:09PM +0200, Eduardo Valentin wrote:
> > 
> >> But maybe these VINT* should be set as always_on in twl4030-regulator driver?
> > 
> > Can they support any external load at all?  If not then it would make
> > sense for the chip driver to at least provide a default set of
> > constraints for them rather than forcing all the machine drivers to do
> > it manually.
> 
>  From the TRM it appears that the max current output values are as follows
> 
> VINTANA1 - 30mA
> VINTANA2 - 250mA
> VINTDIG  - 100mA
> 
> Theoretically they may be able to support external load depending on your machine configuration but still I think providing constraints for them in 
> the chip driver could be a good idea since the "always-on" limitation is imposed by the chip and not the machine. Without these three supplies the TWL 
> does not function properly, if at all. Also worth noting is that the current implementation of RegulatorFW doesn't appear to be able to turn these 
> supplies off (comparing TWL register content with framework status).

VINTANA2 can be turned off if MADC, audio and USB are not used. 

Cheers,

Peter.
-- 
goa is a state of mind
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