linux-kernel - Re: [PATCH 2/3] dt-bindings: gpio: Convert UniPhier GPIO to json-schema

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Message-ID: <CAK7LNARhXbyUwMwXK=afXLnBVzg_MPv2D=oyn5qWkZtv12zmRg@mail.gmail.com>
Date:   Sat, 22 Feb 2020 14:32:36 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     DTML <devicetree@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: gpio: Convert UniPhier GPIO to json-schema

Hi Rob,

On Sat, Feb 22, 2020 at 12:32 AM Rob Herring <robh@...nel.org> wrote:
>
> On Fri, 21 Feb 2020 11:10:01 +0900, Masahiro Yamada wrote:
> > Convert the UniPhier GPIO controller binding to DT schema format.
> >
> > I omitted the 'gpio-ranges' property because it is defined in the
> > dt-schema project (/schemas/gpio/gpio.yaml).
> >
> > As of writing, the 'gpio-ranges-group-names' is not defined in that
> > file despite it is a common property described in
> > Documentation/devicetree/bindings/gpio/gpio.txt
> > So, I defined it in this schema.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > ---
> >
> > I have a question about the range about 'ngpio'.
> >
> >   ngpios:
> >     minimum: 0
> >     maximum: 512
> >
> > The 'ngpio' property is already defined as 'uint32' in the dt-schema tool:
> > https://github.com/robherring/dt-schema/blob/master/schemas/gpio/gpio.yaml#L20
> >
> > 'uint32' is unsigned, so 'minimum: 0' looks too obvious.
> >
> > I cannot omit the minimum because minimum and maximum depend on each other.
> > I just put a sensible number, 512, in maximum.
> >
> > If this range is entirely unneeded, I will delete it.
>
> This property is generally for when you can have some number less
> than a maximum number implied by the compatible string.
>
> If there is really no max (e.g. 2^32 - 1 is valid), then just do
> 'ngpios: true'


What does ': true' mean?


If it is documented somewhere,
could you point me to the reference?

Even if I remove the 'ngpio' entirely
from my dt-schema, the 'ngpio' is checked
correctly.




>
> >
> >
> >  .../bindings/gpio/gpio-uniphier.txt           | 51 -----------
> >  .../gpio/socionext,uniphier-gpio.yaml         | 89 +++++++++++++++++++
> >  MAINTAINERS                                   |  2 +-
> >  3 files changed, 90 insertions(+), 52 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
> >  create mode 100644 Documentation/devicetree/bindings/gpio/socionext,uniphier-gpio.yaml
> >
>
> My bot found errors running 'make dt_binding_check' on your patch:
>
> Documentation/devicetree/bindings/display/simple-framebuffer.example.dts:21.16-37.11: Warning (chosen_node_is_root): /example-0/chosen: chosen node must be at root node
> Error: Documentation/devicetree/bindings/gpio/socionext,uniphier-gpio.example.dts:38.34-35 syntax error
> FATAL ERROR: Unable to parse input tree
> scripts/Makefile.lib:300: recipe for target 'Documentation/devicetree/bindings/gpio/socionext,uniphier-gpio.example.dt.yaml' failed
> make[1]: *** [Documentation/devicetree/bindings/gpio/socionext,uniphier-gpio.example.dt.yaml] Error 1
> Makefile:1263: recipe for target 'dt_binding_check' failed
> make: *** [dt_binding_check] Error 2
>
> See https://patchwork.ozlabs.org/patch/1241747
> Please check and re-submit.

OK, I will.



-- 
Best Regards
Masahiro Yamada