linux-kernel - Re: [PATCH v3 1/4] dt-bindings: gpio: Add bindings for Toshiba Visconti GPIO Controller

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Date:   Wed, 9 Dec 2020 10:39:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Punit Agrawal <punit1.agrawal@...hiba.co.jp>
Cc:     Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, yuji2.ishikawa@...hiba.co.jp,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/4] dt-bindings: gpio: Add bindings for Toshiba
 Visconti GPIO Controller

On Thu, Dec 03, 2020 at 05:16:51PM +0900, Punit Agrawal wrote:
> Iwamatsu-san,
> 
> Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp> writes:
> 
> > Add bindings for the Toshiba Visconti GPIO Controller.
> >
> > Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> > ---
> >  .../bindings/gpio/toshiba,gpio-visconti.yaml  | 85 +++++++++++++++++++
> >  1 file changed, 85 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/gpio/toshiba,gpio-visconti.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/gpio/toshiba,gpio-visconti.yaml b/Documentation/devicetree/bindings/gpio/toshiba,gpio-visconti.yaml
> > new file mode 100644
> > index 000000000000..5168a15b90e1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpio/toshiba,gpio-visconti.yaml
> > @@ -0,0 +1,85 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/gpio/toshiba,gpio-visconti.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Toshiba Visconti ARM SoCs GPIO controller
> > +
> > +maintainers:
> > +  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - const: toshiba,gpio-tmpv7708
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  "#gpio-cells":
> > +    const: 2
> > +
> > +  gpio-ranges: true
> 
> I am not sure I have a good handle on the yaml schema definitions but
> "gpio-ranges" feels like it should be a list of ranges not a boolean.
> 
> Something like -
> 
>     gpio-ranges:
>       maxItems: 1
> 
> feels more appropriate.
> 
> I see both the usages in gpio bindings and for other range properties so
> maybe it's OK. I hope Rob or somebody more knowledgeable on this can
> clarify the usage.

If you know how many (or a range) entries there are for gpio-ranges, 
then maxItems is good. If you don't, then 'gpio-ranges: true' is fine. 
That doesn't make the property a boolean, but just says the property can 
be present.

Rob