linux-kernel - Re: [PATCH v4 1/3] Runtime Interpreted Power Sequences

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Date:	Wed, 22 Aug 2012 07:42:05 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Alex Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dia.com>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Leela Krishna Amudala <leelakrishna.a@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] Runtime Interpreted Power Sequences

On Tue, Aug 21, 2012 at 05:57:38PM +0100, Mark Brown wrote:
> On Tue, Aug 21, 2012 at 12:54:20PM +0300, Tomi Valkeinen wrote:
> 
> > However, if we already have a generic driver for that type of panel,
> > (which we would need anyway for the DT based approach), the developer
> > only needs to add the name of the panel and the data for the power
> > sequence to the panel driver's database, which is about the same amount
> > of work as with DT.
> 
> > So it's really just a question of where to put the data in question, DT
> > or driver. Both contain the same data, and the data structure may also
> > be the same. In DT's case it just needs to be parsed first, whereas in
> > database case you'll enter the data in structs.
> 
> I think the device tree idiomatic way of doing this is to have a bunch
> of .dtsi files for the panels which then get included by reference in
> the board files.  This isn't helpful to people working on non-DT
> architectures though.

One problem that's likely to crop up here again is that the panels won't
be properly describable in the DT. Typically there is no device that can
be addressed by the CPU. This is the same as for backlights and fixed
regulators.

Thierry

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