linux-kernel - Re: [PATCH 4/4] ARM: tegra: roth: add display DT node

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Date:	Tue, 22 Jul 2014 10:45:48 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Terje Bergstrom <tbergstrom@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 4/4] ARM: tegra: roth: add display DT node

On Tue, Jul 22, 2014 at 01:39:51PM +0900, Alexandre Courbot wrote:

> I also don't think that would do it - for many displays the power-on
> sequence is not as simple as "switch all the regulators on".

> Maybe what we would want is to have panel-simple allow panels to
> provide a "probe" callback so they can request and manage any extra
> resource they need. This would of course imply that custom
> enable/disable and suspend/resume callbacks. Then the driver might not
> be "simple" anymore, but IMHO it would not be that bad.

This is starting to mirror the discussion about MMC/SDIO devices where
the talk was of having a property on the device saying which power up
scheme to use - added Ulf for that.

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