linux-kernel - Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

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Date:	Fri, 27 Jul 2012 11:19:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Arnd Bergmann <arnd@...db.de>, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

On Fri, Jul 27, 2012 at 09:05:48PM +0900, Alexandre Courbot wrote:
> Some device drivers (panel backlights especially) need to follow precise
> sequences for powering on and off, involving gpios, regulators, PWMs
> with a precise powering order and delays to respect between each steps.
> These sequences are board-specific, and do not belong to a particular
> driver - therefore they have been performed by board-specific hook
> functions to far.
> 
> With the advent of the device tree and of ARM kernels that are not
> board-tied, we cannot rely on these board-specific hooks anymore but
> need a way to implement these sequences in a portable manner. This patch
> introduces a simple interpreter that can execute such power sequences
> encoded either as platform data or within the device tree.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  Documentation/power/power_seq.txt | 120 +++++++++++++++
>  drivers/base/Kconfig              |   4 +
>  drivers/base/Makefile             |   1 +
>  drivers/base/power_seq.c          | 300 ++++++++++++++++++++++++++++++++++++++
>  include/linux/power_seq.h         | 139 ++++++++++++++++++

What's wrong with drivers/power/?  I sure don't want to maintain this
code, and it seems to not be part of the "driver core" infrastructure.

thanks,

greg k-h
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