linux-kernel - Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic: Document Renesas RZ/Five SoC

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Date:   Mon, 27 Jun 2022 15:22:10 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
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>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic:
 Document Renesas RZ/Five SoC

On 2022-06-27 13:27, Lad, Prabhakar wrote:
> Hi Marc,
> 
> Thank you for the review.
> 
> On Sun, Jun 26, 2022 at 1:35 PM Marc Zyngier <maz@...nel.org> wrote:
>> 
>> On Sun, 26 Jun 2022 01:43:25 +0100,
>> Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>> >
>> > Document Renesas RZ/Five (R9A07G043) SoC.
>> >
>> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>> > ---
>> > v1->v2:
>> > * Fixed binding doc
>> > * Fixed review comments pointed by Krzysztof.
>> >
>> > RFC->v1:
>> > * Fixed Review comments pointed by Geert and Rob
>> > ---
>> >  .../sifive,plic-1.0.0.yaml                    | 44 +++++++++++++++++--
>> >  1 file changed, 41 insertions(+), 3 deletions(-)
>> >
>> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
>> > index 27092c6a86c4..59df367d1e44 100644
>> > --- a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
>> > +++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
>> > @@ -28,7 +28,10 @@ description:
>> >
>> >    While the PLIC supports both edge-triggered and level-triggered interrupts,
>> >    interrupt handlers are oblivious to this distinction and therefore it is not
>> > -  specified in the PLIC device-tree binding.
>> > +  specified in the PLIC device-tree binding for SiFive PLIC (and similar PLIC's),
>> > +  but for the Renesas RZ/Five Soc (AX45MP AndesCore) which has NCEPLIC100 we need
>> > +  to specify the interrupt type as the flow for EDGE interrupts is different
>> > +  compared to LEVEL interrupts.
>> >
>> >    While the RISC-V ISA doesn't specify a memory layout for the PLIC, the
>> >    "sifive,plic-1.0.0" device is a concrete implementation of the PLIC that
>> > @@ -57,6 +60,7 @@ properties:
>> >            - enum:
>> >                - allwinner,sun20i-d1-plic
>> >            - const: thead,c900-plic
>> > +      - const: renesas,r9a07g043-plic
>> 
>> Since it is the NCEPLIC100 that is broken, shouldn't the compatible
>> string actually reflect that? I'd rather see 'andes,nceplic100' once
>> and for all instead of starting with Renesas, quickly followed by all
>> the other licensees that will inevitably integrate the same IP (which
>> isn't even specific to the AX45MP).
>> 
>> This IP also comes with all sort of added (mis-)features, which may or
>> may not be used in the future, and it would make sense to identify it
>> specifically.
>> 
> Agreed, I'll update it as above.

Please synchronise with Samuel to have a common series that fixes
both the Renesas and Thead platforms.

Thanks,

          M.
-- 
Jazz is not dead. It just smells funny...