linux-kernel - Re: [PATCHv9 1/3] Runtime Interpreted Power Sequences

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Date:	Tue, 27 Nov 2012 16:46:07 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Tomi Valkeinen <tomba@....fi>,
	Alex Courbot <acourbot@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Anton Vorontsov <cbouatmailru@...il.com>,
	Stephen Warren <swarren@...dia.com>,
	Mark Zhang <markz@...dia.com>,
	Rob Herring <rob.herring@...xeda.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.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-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>
Subject: Re: [PATCHv9 1/3] Runtime Interpreted Power Sequences

On Tue, Nov 27, 2012 at 04:37:32PM +0100, Laurent Pinchart wrote:

> One possibly crazy idea I had was to replace backlight devices as we know them 
> with LED devices (a LED driver IC shouldn't be supported by different APIs 
> depending on whether the LEDs it drives are used as a backlight or not), and 
> have the panel hook up with the associated LED device to expose backlight 
> operations through the CDF. Panels with a backlight controller tied to the 
> panel controller (control through DSI for instance) would implement the 
> backlight operations directly without instantiating a LED device. This still 
> leaves the question of the userspace backlight brightness API open.

I remember looking at that before but never actually got round to it, it
seems like a sensible idea to me.

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