linux-kernel - Re: [PATCH 4/9] dt-bindings: Add RISC-V incoming MSI controller bindings

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Message-ID: <CAK9=C2UpiM=UC27Bgm+QqSc=27g__QLL3y-wMVJGjO-N-XKThw@mail.gmail.com>
Date:   Wed, 16 Nov 2022 16:04:45 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Atish Patra <atishp@...shpatra.org>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 4/9] dt-bindings: Add RISC-V incoming MSI controller bindings

On Wed, Nov 16, 2022 at 2:30 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 15/11/2022 23:34, Conor Dooley wrote:
> > On Mon, Nov 14, 2022 at 05:59:00PM +0530, Anup Patel wrote:
> >> On Sun, Nov 13, 2022 at 8:18 PM Conor Dooley <conor@...nel.org> wrote:
> >
> >>> Also, the file name says "riscv,imsic", the description says "IMSIC" but
> >>> you've used "imsics" in the compatible. Is this a typo, or a plural?
> >>
> >> Yes, the file name should be consistent. I will update the file name.
> >
> > Is there a reason why the compatible is plural when all of the other
> > mentions etc do not have an "s"? It really did look like a typo to me.
> >
> > It's the "incoming MSI controller", so I am unsure as to where the "s"
> > actually even comes from. Why not just use "riscv,imsic"?
>
> Yep, should be rather consistent with all others, and IMSIC stands for
> Integrated Circuit?

This is intentionally plural because even though we have one
IMSIC per-CPU, Linux (and various OSes) expect one DT node
as MSI controller targeting all CPUs.

The plural compatible string "riscv,imsics" was chosen based
on consensus on RISC-V AIA Task Group meetings.

Regards,
Anup