linux-kernel - Re: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset

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Message-ID: <CAJuYYwRabVbUx7FWDjjRbQ2A8qowj1qHpN9unxXPgi3HfBVtuQ@mail.gmail.com>
Date:	Thu, 12 Jan 2012 07:04:32 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, rpurdie@...ys.net,
	linux-samsung-soc@...r.kernel.org, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, kgene.kim@...sung.com,
	jg1.han@...sung.com, kyungmin.park@...sung.com, cbou@...l.ru,
	kwangwoo.lee@...il.com, augulis.darius@...il.com,
	ben-linux@...ff.org, patches@...aro.org
Subject: Re: [PATCH] backlight: lcd: add driver for raster-type lcd's with
 gpio controlled panel reset

On 11 January 2012 23:15, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> On Wed, Jan 11, 2012 at 04:21:57PM +0530, Thomas Abraham wrote:
>
>> In the case of Exynos4 based Origen board, buck7 of max8997 supplies
>> power to the lcd panel. buck7 is capable of supplying power at
>> different voltage levels but for Origen board, it is required to
>> supply only 3.3V. The constraints for buck7 can specify 'apply_uV' and
>> this will ensure that buck7 is configured to supply 3.3V.
>
>> But 'apply_uV' seems to be not ideal for regulators that supply power
>> to lcd panels. It would be better to power lcd panels only when video
>> data has to be displayed.
>
> What makes you say this?  Enabling and disabling a regulator are
> entirely orthogonal to setting the regulator voltage.

Sorry, I got this wrong. I will remove the regulator_set_voltage()
call from the driver.

Thanks,
Thomas.
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