linux-kernel - Re: [PATCH v7 11/11] dt-bindings: net: dsa: qca8k: add LEDs definition example

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Date:   Wed, 21 Dec 2022 02:41:50 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Rob Herring <robh@...nel.org>
Cc:     Christian Marangi <ansuelsmth@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-leds@...r.kernel.org,
        Tim Harvey <tharvey@...eworks.com>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: Re: [PATCH v7 11/11] dt-bindings: net: dsa: qca8k: add LEDs
 definition example

> > > +                        };
> > > +
> > > +                        led@1 {
> > > +                            reg = <1>;
> > > +                            color = <LED_COLOR_ID_AMBER>;
> > > +                            function = LED_FUNCTION_LAN;
> > > +                            function-enumerator = <1>;
> > 
> > Typo? These are supposed to be unique. Can't you use 'reg' in your case?
> 
> reg in this context is the address of the PHY on the MDIO bus. This is
> an Ethernet switch, so has many PHYs, each with its own address.

Actually, i'm wrong about that. reg in this context is the LED number
of the PHY. Typically there are 2 or 3 LEDs per PHY.

There is no reason the properties need to be unique. Often the LEDs
have 8 or 16 functions, identical for each LED, but with different
reset defaults so they show different things.

   Andrew