linux-kernel - Re: [PATCH v2 1/5] dt-bindings: input: Increase maximum keycode value to 0x2ff

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Date:   Fri, 10 Jun 2022 07:23:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Heinrich Schuchardt <xypron.glpk@....de>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Artur Rojek <contact@...ur-rojek.eu>,
        Maxime Ripard <mripard@...nel.org>,
        Jeff LaBundy <jeff@...undy.com>, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: input: Increase maximum keycode
 value to 0x2ff

On Thu, Jun 09, 2022 at 07:46:51AM +0200, Heinrich Schuchardt wrote:
> On 6/8/22 23:12, Rob Herring wrote:
> > The maximum keycode value for Linux is 0x2ff, not 0xff. There's already
> > users and examples with values greater than 0xff, but the schema is not
> > yet applied in those cases.
> > 
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >   Documentation/devicetree/bindings/input/input.yaml | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/input/input.yaml b/Documentation/devicetree/bindings/input/input.yaml
> > index d41d8743aad4..43d2f299c332 100644
> > --- a/Documentation/devicetree/bindings/input/input.yaml
> > +++ b/Documentation/devicetree/bindings/input/input.yaml
> > @@ -21,7 +21,7 @@ properties:
> >       $ref: /schemas/types.yaml#/definitions/uint32-array
> >       items:
> >         minimum: 0
> > -      maximum: 0xff
> > +      maximum: 0x2ff
> 
> Can this value of 0x2ff be make exportable such that we can use it as a
> reference in devicetree/bindings/input/adc-keys.yaml. E.g. define a type
> that only take values in the 0-0x2ff range?

There's no need. The $ref to input.yaml in does that effectively 
already. That's why 'linux,code' doesn't need any schema constraints 
unless it has additional constraints. max77650-onkey.yaml in patch 2 has 
an example of that. If you wanted to add a new, custom property with 
those constraints, then we could do something like this:

$defs:
  input-codes:
    minimum: 0
    maximum: 0x2ff
    ...

And then have: $ref: input.yaml#/$defs/input-codes

Rob