linux-kernel - Re: [PATCH] leds: add NCT6795D driver

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Date:   Fri, 17 Jul 2020 09:44:10 +0200
From:   Pavel Machek <pavel@....cz>
To:     Alexandre Courbot <gnurou@...il.com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH] leds: add NCT6795D driver

Hi!

> > >>> Add support for the LED feature of the NCT6795D chip found on some
> > >>> motherboards, notably MSI ones. The LEDs are typically used using a
> > >>> RGB connector so this driver creates one LED device for each color
> > >>> component.
> > >>
> > >> Ok, let me take a look. What entries does it present in /sys?
> > >
> > > Right now these 3 directories in /sys/class/leds:
> > >
> > > nct6795d:blue:
> > > nct6795d:green:
> > > nct6795d:red:
> > >
> > > with the usual suspects `brightness` and `max_brightness` in each. I
> > > am not 100% sure I got the names right so please let me know if that
> > > is not correct.
> >
> > You miss LED function, that should be in the second section.

third section?

> The reason for not having a function at the moment is that I took a
> look at include/dt-bindings/leds/common.h and could not find any
> function that could reasonably apply. This basically controls a RGB
> connector on the motherboard which serves no particular function - you
> can plug a RGB fan or anything else you want and control it in any
> fashion. Is there a function that applies to this use-case?

This is normally used for motherboard lightning, right? I believe this
is getting common on gaming boards, and we want common support for
that.

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

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