linux-kernel - Re: Re: [PATCH v4 2/3] regulator MAX8998/LP3974: Support DVS-GPIO.

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Date:	Wed, 05 Jan 2011 00:54:25 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Lukasz Majewski <l.majewski@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	박경민 <kyungmin.park@...sung.com>,
	심준영 <jy0922.shim@...sung.com>,
	"myungjoo.ham@...il.com" <myungjoo.ham@...il.com>
Subject: Re: Re: [PATCH v4 2/3] regulator MAX8998/LP3974: Support DVS-GPIO.

On Tue, Jan 04, 2011 at 22:44PM +0900, Mark Brown wrote:
> On Tue, Jan 04, 2011 at 05:16:56PM +0900, MyungJoo Ham wrote:
> > On Tue, Jan 4, 2011 at 4:49 PM, Lukasz Majewski wrote:
> 
> > > Is it desirable to define all four for BUCK1 and two for BUCK2 DVS
> > > voltages in platform code?
> 
> > In case a system with 4 buck1 preset voltages and 2 buck2 preset
> > voltages, it is desirable. :)
> 
> I suspect Lukasz's question is more why this would be useful; I can
> imagine that the main reason would be performance and in any case I
> don't see it hurting to have the option.
>

Yes, it is supposed to be faster to set GPIO pins rather than sending values thru I2C busses. And some boards require all the four BUCK1 voltages and two BUCK2 voltages; e.g., S5PC110-Universal.

 MyungJoo Ham (함명주)
Mobile Software Platform Lab,
Digital Media and Communications (DMC) Business
Samsung Electronics
cell: +82-10-6714-2858 / office: +82-31-279-8033