linux-kernel - Re: [RFC PATCH 0/1] leds: backlight: Register with class backlight

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Date:   Mon, 25 Nov 2019 19:19:32 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Guido Günther <agx@...xcpu.org>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Enrico Weigelt <info@...ux.net>,
        Allison Randal <allison@...utok.net>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] leds: backlight: Register with class backlight

Hi Guido,

You might want to check the pending patch set [0].

On 11/25/19 3:47 PM, Guido Günther wrote:
> When using current LCD drivers as ledtrig backlight they're
> not registered with the backlight device class. This has
> two problems: they're usually not found by userspace since
> these tools usually look in /sys/class/backlight and they
> can't be used as backlight phandles in device tree for
> e.g. LCD panels.
> 
> This is an RFC if this is worthwhile at all? A current problem
> is that changing the LED brightness does currently not notify
> the class backlight so they can get out of sync but i could
> look into that if the approach makes sense.
> 
> 
> Guido Günther (1):
>   leds: backlight: register with class backlight too
> 
>  drivers/leds/trigger/ledtrig-backlight.c | 54 ++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 

[0]
https://lore.kernel.org/linux-leds/20191007124437.20367-1-jjhiblot@ti.com/

-- 
Best regards,
Jacek Anaszewski