linux-kernel - Re: [PATCH] dt-bindings: timer: sifive,clint: Fix number of interrupts

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Date:   Fri, 26 Nov 2021 10:03:39 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jessica Clarke <jrtc27@...c27.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup.patel@....com>
Subject: Re: [PATCH] dt-bindings: timer: sifive,clint: Fix number of interrupts

On Thu, Nov 25, 2021 at 4:23 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> To improve human readability and enable automatic validation, the tuples
> in "interrupts-extended" properties should be grouped using angle
> brackets.  As the DT bindings lack an upper bound on the number of
> interrupts, thus assuming one, proper grouping is currently flagged as
> an error.
>
> Fix this by adding the missing "maxItems", limiting it to 10 interrupts
> (two interrupts for a system management core, and two interrupts per
> core for other cores), which should be sufficient for now.
>
> Group the tuples in the example.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  .../devicetree/bindings/timer/sifive,clint.yaml          | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> index a35952f487426988..55bec2d059807c48 100644
> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> @@ -43,6 +43,7 @@ properties:
>
>    interrupts-extended:
>      minItems: 1
> +    maxItems: 10

Cfr. Jessica's comment on my PLIC patch:

The maximum supported by the CLINT memory map is 8192.
Device-specific limits would be 4 for k210 and jh7100, and 10 for
fu540.

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