linux-kernel - Re: [PATCH v1 2/3] dt-bindings: riscv: convert plic bindings to json-schema

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Message-ID: <CAL_JsqJSF=p657tdvm4CW_LYi93t6vG0aOmQxUmYYW3_5h5UHQ@mail.gmail.com>
Date:   Mon, 22 Mar 2021 11:36:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Sagar Kadam <sagar.kadam@...ive.com>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yash Shah <yash.shah@...ive.com>
Subject: Re: [PATCH v1 2/3] dt-bindings: riscv: convert plic bindings to json-schema

On Mon, Mar 22, 2021 at 9:38 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Sagar, Rob,
>
> (replying to an old email, as this one seems to be the most appropriate)
>
> On Tue, Sep 22, 2020 at 10:34 PM Rob Herring <robh@...nel.org> wrote:
> > On Thu, Sep 10, 2020 at 04:14:03PM +0530, Sagar Kadam wrote:
> > > Convert device tree bindings for SiFive's PLIC to YAML format
> > >
> > > Signed-off-by: Sagar Kadam <sagar.kadam@...ive.com>
>
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
>
> > > +
> > > +  '#address-cells':
> > > +    const: 0
> > > +    description: Should be <0> or more.
> >
> > Drop. 'or more' is wrong. If there's a case with more, it will need to
> > be documented.
>
> Why do we have the "'#address-cells': const: 0" at all...
>
> > > +required:
> > > +  - compatible
> > > +  - '#address-cells'
>
> ... and why is it required?

It is only required if an 'interrupt-map' points to this node.
Currently dtc is warning if it is missing always, but there are plans
to relax dtc to only warn when 'interrupt-map' is present. Of course,
if you had 'interrupt-map' in an overlay, you'd want #address-cells in
the base dt and there's no other way to check that than making it
required.

Rob