linux-kernel - Re: [PATCH v5 3/3] dt-bindings: leds: Convert pwm to yaml

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Date:   Tue, 29 Sep 2020 09:39:01 +0200
From:   Alexander Dahl <ada@...rsis.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Alexander Dahl <post@...pocky.de>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        linux-kernel@...r.kernel.org,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Marek Behún <marek.behun@....cz>
Subject: Re: [PATCH v5 3/3] dt-bindings: leds: Convert pwm to yaml

Hei hei,

Am Dienstag, 22. September 2020, 17:57:47 CEST schrieb Rob Herring:
> Use generic node names:
> 
> led-controller {
> 
> > +        compatible = "pwm-leds";
> > +
> > +        led-1 {
> > +            label = "omap4::keypad";
> > +            pwms = <&twl_pwm 0 7812500>;
> > +            max-brightness = <127>;
> > +        };
> > +
> > +        led-2 {
> > +            color = <LED_COLOR_ID_GREEN>;
> > +            function = LED_FUNCTION_CHARGING;
> > +            pwms = <&twl_pwmled 0 7812500>;
> > +            max-brightness = <255>;
> > +        };
> > +    };
> > +
> > +...

This is clear for the "one led-controller" case.  However, when trying to fix 
those node names in existing .dts files, I wondered how those should be named 
for multiple, different led-controllers, e.g. one using "pwm-leds" and another 
one using "gpio-leds"?  

See arch/arm/boot/dts/at91-kizbox3-hs.dts for example, the nodes are called 
"pwm_leds" and "leds" currently.  If both were part of a .dtsi and both named 
the same, you could not overwrite/complement those in a .dts file including 
that .dtsi due to a name conflict. 

Just append a numerical index like this?

  led-controller-1 {
    …
  };

  led-controller-2 {
    …
  };

Greets 
Alex