linux-kernel - Re: [PATCH v4 4/6] dt: bindings: lp8860: Add trigger binding to the lp8860

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Date:   Fri, 15 Dec 2017 22:00:42 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, rpurdie@...ys.net,
        jacek.anaszewski@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v4 4/6] dt: bindings: lp8860: Add trigger binding to the
 lp8860

On Fri 2017-12-15 11:22:24, Dan Murphy wrote:
> Pavel
> 
> On 12/15/2017 03:09 AM, Pavel Machek wrote:
> > Hi!
> > 
> >> @@ -35,6 +37,7 @@ led-controller@2d {
> >>  	led@0 {
> >>  		reg = <0>;
> >>  		label = "white:display_cluster";
> >> +		linux,default-trigger = "backlight";
> >>  	};
> >>  }
> > 
> > What is "display_cluster"? Is it display backlight?
> > 
> 
> This device can be configured to drive all 4 LED strings in display mode
> so that all 4 strings have the same brightness controlled either through PWM or
> through the brightness register 
> 
> or
> 
> As cluster string where the brightness of individual strings or clustered strings
> can be controlled via independent brightness control registers.  I am currently working
> on adding this support to the driver.

Ok; but I guess I'd like to keep this implementation detail away from
kernel, and just expose as display:white:backlight or something like that.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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