linux-kernel - Re: [PATCH 2/3] Input: rotary-encoder-counter: add DT bindings

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Date:   Tue, 7 Apr 2020 16:22:38 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 2/3] Input: rotary-encoder-counter: add DT bindings

On Tue, Apr 07, 2020 at 01:03:39PM +0200, Kamel Bouhara wrote:
> > On Mon, Apr 06, 2020 at 05:58:05PM +0200, Kamel Bouhara wrote:
> > > Add dt binding for the counter variant of the rotary encoder driver.
> > >
> > > Signed-off-by: Kamel Bouhara <kamel.bouhara@...tlin.com>
> > > ---
> > >  .../input/rotary-encoder-counter.yaml         | 67 +++++++++++++++++++
> > >  1 file changed, 67 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml b/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> > > new file mode 100644
> > > index 000000000000..a59f7c1faf0c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> > > @@ -0,0 +1,67 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> >
> > Bindings are usually used by other OS's, so you should consider
> > putting it under a more permissive license, usually that would be GPL2
> > and the BSD-2-Clause
>
> Well to be honest I just looked into an existing binding and I guess
> the wrong one :).

Not the wrong ones, but the old ones :)

It's painful to change a license on existing files, whereas it's
pretty easy to mention it during review.

> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/input/rotary-encoder-counter.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Rotary Encoder Counter
> > > +
> > > +maintainers:
> > > +  - Kamel Bouhara <kamel.bouhara@...tlin.com>
> > > +
> > > +description:
> > > +  Registers a Rotary encoder connected through a counter device.
> >
> > You shouldn't really describe the action here, but more what the
> > binding is about. The registration will not depend on the presence of
> > the node following that binding, but rather on whether or not the OS
> > that uses it has support for it.
> >
>
> Then shall it be better with just :
> "A rotary encoder device using a generic counter interface." ?

The generic counter interface is a Linux-only stuff though, some other
OS might want to implement something else. Something like "based on a
counter"?

Maxime

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