linux-kernel - Re: [PATCH] pwm-backlight: Add support for active low PWM backlights

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Message-ID: <20121106064405.GB14863@avionic-0098.mockup.avionic-design.de>
Date:	Tue, 6 Nov 2012 07:44:06 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Alban Bedel <alban.bedel@...onic-design.de>
Cc:	linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH] pwm-backlight: Add support for active low PWM backlights

On Mon, Nov 05, 2012 at 04:49:01PM +0100, Alban Bedel wrote:
> Signed-off-by: Alban Bedel <alban.bedel@...onic-design.de>
> ---
>  .../bindings/video/backlight/pwm-backlight.txt     |    1 +
>  drivers/video/backlight/pwm_bl.c                   |   22 ++++++++++++++-----
>  include/linux/pwm_backlight.h                      |    1 +
>  3 files changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
> index 1e4fc72..3a40539 100644
> --- 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?

Thierry

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