linux-kernel - Re: [PATCH 1/2] dt-bindings: leds: Mention GPIO triggers

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Date:   Thu, 14 Sep 2023 10:40:40 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Jan Kundrát <jan.kundrat@...net.cz>,
        Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: leds: Mention GPIO triggers

On Wed, Sep 13, 2023 at 3:34 PM Rob Herring <robh@...nel.org> wrote:
> On Tue, Sep 12, 2023 at 03:44:30PM +0200, Linus Walleij wrote:
> > We reuse the trigger-sources phandle to just point to
> > GPIOs we may want to use as LED triggers.
> >
> > Example:
> >
> > gpio: gpio@0 {
> >     compatible "my-gpio";
> >     gpio-controller;
> >     #gpio-cells = <2>;
> >     interrupt-controller;
> >     #interrupt-cells = <2>;
> >     #trigger-source-cells = <2>;
>
> BTW, this is not documented for any GPIO binding. If we want to specify
> the cell size, then it has to be added to every GPIO controller binding.
> If not, we then need to reference gpio.yaml in every GPIO controller
> binding (along with unevaluatedProperties). Doesn't have to be done for
> this patch to go in though.

Yeah I mean this trigger-sources = <...>; one-size-fits-all is a bit
weird in a way.

My other idea was to simply add trigger-gpios to the normal way
and be done with it, but now the trigger binding has this weird
thing.

Would trigger-gpios be better?

Yours,
Linus Walleij