netdev - Re: [PATCH 2/3] dt-bindings: leds: Add `excludes` property

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Message-ID: <20211014102918.GA21116@duo.ucw.cz>
Date:   Thu, 14 Oct 2021 12:29:18 +0200
From:   Pavel Machek <pavel@....cz>
To:     Marek Behún <kabel@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-leds@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>, robh+dt@...nel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: leds: Add `excludes` property

Hi!

> Some RJ-45 connectors have LEDs wired in the following way:
> 
>          LED1
>       +--|>|--+
>       |       |
>   A---+--|<|--+---B
>          LED2
> 
> With + on A and - on B, LED1 is ON and LED2 is OFF. Inverting the
> polarity turns LED1 OFF and LED2 ON.
> 
> So these LEDs exclude each other.
> 
> Add new `excludes` property to the LED binding. The property is a
> phandle-array to all the other LEDs that are excluded by this LED.

I don't think this belongs to the LED binding.

This is controller limitation, and the driver handling the controller
needs to know about it... so it does not need to learn that from the
LED binding.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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