netdev - Re: lets settle the LED `function` property regarding the netdev trigger

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Message-ID: <YVyxlEVQ7TvMs5DH@lunn.ch>
Date:   Tue, 5 Oct 2021 22:12:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Marek Behún <kabel@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: lets settle the LED `function` property regarding the netdev
 trigger

> > > There are two different ways this can be implemented. There can be two
> > > independent LEDs within the same package. So you can generate three
> > > colours. Or there can be two cross connected LEDs within the
> > > package. Apply +ve you get one colour, apply -ve you get a different
> > > colour. Since you cannot apply both -ve and +ve at the same time, you
> > > cannot get both colours at once.
> > > 
> > > If you have two independent LEDs, I would define two LEDs in DT.
> > 
> > No, we have multicolor LED API which is meant for exactly this
> > situation: a multicolor LED.

> What do you mean by dependency here?

https://www.youtube.com/watch?v=5M9p25OfKdg

There are two different ways you can two LEDs in one package.

Some Ethernet PHY RJ45 connector housings have bi-colour LEDs. Some
have tri-colour LEDs, and some have mono-colour LEDs.

      Andrew