linux-kernel - Re: [PATCH 0/4] Add a generic driver for LED-based backlight

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Message-ID: <20190705101434.fw5rpctnqt6dwg6e@devuan>
Date:   Fri, 5 Jul 2019 12:14:34 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     jacek.anaszewski@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, lee.jones@...aro.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com, dmurphy@...com,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, tomi.valkeinen@...com
Subject: Re: [PATCH 0/4] Add a generic driver for LED-based backlight

On Mon 2019-07-01 17:14:19, Jean-Jacques Hiblot wrote:
> This series aims to add a led-backlight driver, similar to pwm-backlight,
> but using a LED class device underneath.
> 
> A few years ago (2015), Tomi Valkeinen posted a series implementing a
> backlight driver on top of a LED device:
> https://patchwork.kernel.org/patch/7293991/
> https://patchwork.kernel.org/patch/7294001/
> https://patchwork.kernel.org/patch/7293981/
> 
> The discussion stopped because Tomi lacked the time to work on it.
> 
> This series takes it from there and implements the binding that was
> discussed in https://patchwork.kernel.org/patch/7293991/. In this new
> binding the backlight device is a child of the LED controller instead of
> being another platform device that uses a phandle to reference a LED.

Other option would be to have backlight trigger. What are
advantages/disadvantages relative to that?
									Pavel

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