linux-kernel - Re: [PATCH v6 1/4] Runtime Interpreted Power Sequences

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Date:	Thu, 13 Sep 2012 08:45:39 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
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>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Leela Krishna Amudala <l.krishna@...sung.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-pm@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 1/4] Runtime Interpreted Power Sequences

On Wed, 2012-09-12 at 18:57 +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.

The sequences are not board-specific, they are device (backlight, etc.)
specific. The sequences have been handled in board-specific hook
functions so far because there hasn't been proper drivers for the
devices.

If I were to take the same panel (and backlight) you have and install it
on my board, I would need the same power sequence.

 Tomi


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