linux-kernel - Re: [PATCH v3 2/3] dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Update description for '#interrupt-cells' property

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Date:   Thu, 11 Aug 2022 16:50:34 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v3 2/3] dt-bindings: interrupt-controller:
 renesas,rzg2l-irqc: Update description for '#interrupt-cells' property

Hi Marc,

On Sun, Jul 24, 2022 at 1:01 PM Marc Zyngier <maz@...nel.org> wrote:
> On Fri, 22 Jul 2022 16:11:54 +0100,
> Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> >
> > Update description for '#interrupt-cells' property to utilize the
> > RZG2L_{NMI,IRQX} for the first cell defined in the
> > include/dt-bindings/interrupt-controller/irqc-rzg2l.h file.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v3:
> > * New patch

> > --- a/Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
> > @@ -31,8 +31,9 @@ properties:
> >        - const: renesas,rzg2l-irqc
> >
> >    '#interrupt-cells':
> > -    description: The first cell should contain external interrupt number (IRQ0-7) and the
> > -                 second cell is used to specify the flag.
> > +    description: The first cell should contain a macro RZG2L_{NMI,IRQX} included in the
> > +                 include/dt-bindings/interrupt-controller/irqc-rzg2l.h and the second
> > +                 cell is used to specify the flag.
>
> I think a binding should be self describing, and not rely on an opaque
> macro. Mentioning that there is a macro that encodes it is fine, but
> the values are what matter, specially when considering that other OSs
> could (and should be able to) write their own DTs from scratch without
> depending on something that is very much Linux-specific.

The macros are not Linux-specific, and are part of the bindings.
But the only hard dependency on <dt-bindings/interrupt-controller/irqc-rzg2l.h>
is the DT source file describing the board.

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds