linux-kernel - Re: [PATCH V3 1/2] dt-bindings: update riscv plic compatible string

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Date:   Wed, 13 Oct 2021 10:57:40 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Guo Ren <guoren@...nel.org>, Anup Patel <anup@...infault.org>
Cc:     Atish Patra <atish.patra@....com>, Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Rob Herring <robh@...nel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: Re: [PATCH V3 1/2] dt-bindings: update riscv plic compatible string

Hi Anup,

Am Mittwoch, 13. Oktober 2021, 07:11:46 CEST schrieb Anup Patel:
> On Wed, Oct 13, 2021 at 6:52 AM <guoren@...nel.org> wrote:
> >
> > From: Guo Ren <guoren@...ux.alibaba.com>
> >
> > Add the compatible string "thead,c900-plic" to the riscv plic
> > bindings to support SOCs with thead,c9xx processor cores.
> >
> > Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> > Cc: Rob Herring <robh@...nel.org>
> > Cc: Palmer Dabbelt <palmerdabbelt@...gle.com>
> > Cc: Anup Patel <anup@...infault.org>
> > Cc: Atish Patra <atish.patra@....com>
> >
> > ---
> >
> > Changes since V3:
> >  - Rename "c9xx" to "c900"
> >  - Add thead,c900-plic in the description section
> > ---
> >  .../bindings/interrupt-controller/sifive,plic-1.0.0.yaml    | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > 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 08d5a57ce00f..82629832e5a5 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
> > @@ -35,6 +35,11 @@ description:
> >    contains a specific memory layout, which is documented in chapter 8 of the
> >    SiFive U5 Coreplex Series Manual <https://static.dev.sifive.com/U54-MC-RVCoreIP.pdf>.
> >
> > +  While the "thead,c900-plic" would mask IRQ with readl(claim), so it needn't
> > +  mask/unmask which needed in RISC-V PLIC. When in IRQS_ONESHOT & IRQCHIP_EOI_THREADED
> > +  path, unnecessary mask operation would cause a blocking irq bug in thead,c900-plic.
> > +  Because when IRQ is disabled in c900, writel(hwirq, claim) would be invalid.
> 
> This is a totally incorrect description of the errata required for C9xx PLIC.
> 
> Please don't project non-compliance as a feature of C9xx PLIC.
> 
> > +
> >  maintainers:
> >    - Sagar Kadam <sagar.kadam@...ive.com>
> >    - Paul Walmsley  <paul.walmsley@...ive.com>
> > @@ -46,6 +51,7 @@ properties:
> >        - enum:
> >            - sifive,fu540-c000-plic
> >            - canaan,k210-plic
> > +          - thead,c900-plic

we still want specific SoC names in the compatible, the "c900"
is still a sort-of placeholder.


> >        - const: sifive,plic-1.0.0
> 
> The PLIC DT node requires two compatible string:
> <implementation_compat>, <spec_compat>
> 
> The C9xx PLIC is not RISC-V PLIC so, the DT node should
> be: "thead,c900-plic", "thead,c9xx-plic"
> 
> You need to change "- const: sifive,plic-1.0.0" to
> - enum:
>     - sifive,plic-1.0.0
>     - thead,c9xx-plic