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

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Message-ID: <20120111174540.GE24213@opensource.wolfsonmicro.com>
Date:	Wed, 11 Jan 2012 17:45:41 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Thomas Abraham <thomas.abraham@...aro.org>
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 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.
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