linux-kernel - Re: [RFC][PATCH 0/4] lcd: platform-lcd: Add lcd panel and device tree support

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Message-ID: <20120102073430.GH13015@ponder.secretlab.ca>
Date:	Mon, 2 Jan 2012 00:34:30 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Abraham <thomas.abraham@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	rpurdie@...ys.net, linux-samsung-soc@...r.kernel.org,
	rob.herring@...xeda.com, kgene.kim@...sung.com,
	jg1.han@...sung.com, broonie@...nsource.wolfsonmicro.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: [RFC][PATCH 0/4] lcd: platform-lcd: Add lcd panel and device
 tree support

On Mon, Jan 02, 2012 at 11:24:31AM +0530, Thomas Abraham wrote:
> The platform-lcd driver depends on platform-specific callbacks to setup the
> lcd panel. These callbacks are supplied using driver's platform data. But
> for adding device tree support for platform-lcd driver, providing such
> callbacks is not possible (without using auxdata).
> 
> Since the callbacks are usually lcd panel specific, it is possible to include
> the lcd panel specific setup and control functionality in the platform-lcd
> driver itself, thereby eliminating the need for supplying platform specific
> callbacks to the driver. The platform-lcd driver can include support for
> multiple lcd panels.
> 
> This patchset removes the need for platform data for platform-lcd driver and
> adds support which can be used to implement lcd panel specific functionality
> in the driver. As an example, the support for Hydis hv070wsa lcd panel is added
> to the platform-lcd driver which is then used on the Exynos4 based Origen board.
> This currently breaks build for other users of platform-lcd driver. Those can be
> fixed if this approach is acceptable.

Approach looks okay to me.  I've not looked too deeply though.

g.

> 
> Thomas Abraham (4):
>   lcd: platform-lcd: Eliminate need for platform data
>   lcd: platform-lcd: Add support for Hydis hv070wsa lcd panel
>   ARM: Exynos: Remove platform data of platform-lcd driver
>   lcd: platform-lcd: Add device tree support
> 
>  arch/arm/mach-exynos/mach-origen.c     |   25 +-----
>  drivers/video/backlight/Kconfig        |    6 ++
>  drivers/video/backlight/platform_lcd.c |  128 ++++++++++++++++++++++++++++---
>  include/video/platform_lcd.h           |   11 +--
>  4 files changed, 129 insertions(+), 41 deletions(-)
> 
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