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

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Date:   Mon, 28 Sep 2020 11:11:18 -0500
From:   Rob Herring <robh@...nel.org>
To:     Alexander Dahl <ada@...rsis.com>
Cc:     Alexander Dahl <post@...pocky.de>,
        Marek Behún <marek.behun@....cz>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Pavel Machek <pavel@....cz>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        devicetree@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>
Subject: Re: [PATCH v5 3/3] dt-bindings: leds: Convert pwm to yaml

On Mon, Sep 28, 2020 at 6:19 AM Alexander Dahl <ada@...rsis.com> wrote:
>
> Hello Rob,
>
> Am Dienstag, 22. September 2020, 17:42:58 CEST schrieb Rob Herring:
> > On Sat, 19 Sep 2020 07:31:45 +0200, Alexander Dahl wrote:
> > > The example was adapted slightly to make use of the 'function' and
> > > 'color' properties.  License discussed with the original author.
> > >
> > > Suggested-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
> > > Signed-off-by: Alexander Dahl <post@...pocky.de>
> > > Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> > > ---
> > >
> > > Notes:
> > >     v4 -> v5:
> > >       * updated based on feedback by Rob Herring
> > >       * removed Acked-by
> > >
> > >     v3 -> v4:
> > >       * added Cc to original author of the binding
> > >
> > >     v2 -> v3:
> > >       * changed license identifier to recommended one
> > >       * added Acked-by
> > >
> > >     v2:
> > >       * added this patch to series (Suggested-by: Jacek Anaszewski)
> > >
> > >  .../devicetree/bindings/leds/leds-pwm.txt     | 50 -----------
> > >  .../devicetree/bindings/leds/leds-pwm.yaml    | 82 +++++++++++++++++++
> > >  2 files changed, 82 insertions(+), 50 deletions(-)
> > >  delete mode 100644 Documentation/devicetree/bindings/leds/leds-pwm.txt
> > >  create mode 100644 Documentation/devicetree/bindings/leds/leds-pwm.yaml
> >
> > My bot found errors running 'make dt_binding_check' on your patch:
> >
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mfd/iqs
> > 62x.example.dt.yaml: pwmleds: 'panel' does not match any of the regexes:
> > '^led(-[0-9a-f]+)?$', 'pinctrl-[0-9]+' From schema:
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/leds/l
> > eds-pwm.yaml
>
> I somehow expected errors on those checks, because I got actually two
> different recommendations from you:
>
> In feedback on v4 of this patch (series) you recommended '^led(-[0-9a-f]+)?$'
> for the (pwm) led node name, which I used in v5.  Or just allow any node name
> with ".*" like in gpio-keys.yaml …
>
> I just checked all in-tree dts files using "pwm-leds" and each also defines
> the "label" property, so renaming those nodes should not alter the paths in
> sysfs, if I understood everything correctly.  So I see two options now:
>
> 1) Go with the stricter check and fix all failing dts files and examples.
>
> 2) Just use the very loose check.

Either one is fine. Given label is present and there's not a ton of
cases, then I'd probably go with 1.

> If 1), which patch would go first, renaming nodes in dts and examples or
> converting bindings to yaml enabling the stricter check?

There's currently no requirement on dts files being warning free. So
the schema can come first and any dts fixes later.

Rob