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Message-ID: <20121107131037.3bd52a96@avionic-0020.adnet.avionic-design.de> Date: Wed, 7 Nov 2012 13:10:37 +0100 From: Alban Bedel <alban.bedel@...onic-design.de> To: Thierry Reding <thierry.reding@...onic-design.de> Cc: linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>, Alban Bedel <alban.bedel@...onic-design.de> Subject: Re: [PATCH] pwm-backlight: Add support for active low PWM backlights On Tue, 6 Nov 2012 07:44:06 +0100 Thierry Reding <thierry.reding@...onic-design.de> wrote: > > --- a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt > > +++ b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt > > @@ -14,6 +14,7 @@ Required properties: > > Optional properties: > > - pwm-names: a list of names for the PWM devices specified in the > > "pwms" property (see PWM binding[0]) > > + - active-low: boolean indicating that the backlight use active low logic > > Couldn't you use the brightness-levels property to achieve the same > effect? Not in the current state as the curve currently hardcode the fact the first element have 0% duty and the last 100%. But relaxing this limitation is probably better as it would also allow clamping the curve like the lth_brightness parameter do when no curve is used. I'll send a new patch implementing this soon. Alban -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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