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

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Date:   Fri, 24 Jun 2022 10:59:40 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH RFC 1/2] dt-bindings: interrupt-controller: sifive,plic:
 Document Renesas RZ/Five SoC

Hi Rob,

Thank you for the review.

On Sun, Jun 5, 2022 at 3:23 PM Rob Herring <robh@...nel.org> wrote:
>
> On Tue, May 24, 2022 at 06:22:13PM +0100, Lad Prabhakar wrote:
> > Document Renesas RZ/Five (R9A07G043) SoC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  .../sifive,plic-1.0.0.yaml                    | 38 +++++++++++++++++--
> >  1 file changed, 35 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..78ff31cb63e5 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
> >
> >    reg:
> >      maxItems: 1
> > @@ -64,8 +68,7 @@ properties:
> >    '#address-cells':
> >      const: 0
> >
> > -  '#interrupt-cells':
> > -    const: 1
> > +  '#interrupt-cells': true
> >
> >    interrupt-controller: true
> >
> > @@ -91,6 +94,35 @@ required:
> >    - interrupts-extended
> >    - riscv,ndev
> >
> > +if:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        const: renesas-r9a07g043-plic
> > +then:
> > +  properties:
> > +    clocks:
> > +      maxItems: 1
> > +
> > +    resets:
> > +      maxItems: 1
> > +
> > +    power-domains:
> > +      maxItems: 1
>
> Did you test this? The above properties won't be allowed because of
> additionalProperties below. You need to change it to
> 'unevaluatedProperties' or move these to the top level.
>
Yes I have run the dt_binding check.

So with the below diff it does complain about the missing properties.

prasmi@...smi:~/work/renasas/renesas-drivers$ git diff
Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
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 20ded037d444..bb14a4b1ec0a 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
@@ -130,7 +130,7 @@ examples:
     plic: interrupt-controller@...0000 {
       #address-cells = <0>;
       #interrupt-cells = <1>;
-      compatible = "sifive,fu540-c000-plic", "sifive,plic-1.0.0";
+      compatible = "renesas-r9a07g043-plic";
       interrupt-controller;
       interrupts-extended = <&cpu0_intc 11>,
                             <&cpu1_intc 11>, <&cpu1_intc 9>,
prasmi@...smi:~/work/renasas/renesas-drivers$ make ARCH=riscv
CROSS_COMPILE=riscv64-linux-gnu- dt_binding_check
  LINT    Documentation/devicetree/bindings
  CHKDT   Documentation/devicetree/bindings/processed-schema.json
  SCHEMA  Documentation/devicetree/bindings/processed-schema.json
  DTEX    Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dts
  DTC     Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb
  CHECK   Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb:
interrupt-controller@...0000: #interrupt-cells:0:0: 2 was expected
    From schema:
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb:
interrupt-controller@...0000: 'clocks' is a required property
    From schema:
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb:
interrupt-controller@...0000: 'resets' is a required property
    From schema:
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.example.dtb:
interrupt-controller@...0000: 'power-domains' is a required property
    From schema:
/home/prasmi/work/renasas/renesas-drivers/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
prasmi@...smi:~/work/renasas/renesas-drivers$
prasmi@...smi:~/work/renasas/renesas-drivers$

Is there something I'm missing here?

Cheers,
Prabhakar

> > +
> > +    '#interrupt-cells':
> > +      const: 2
> > +
> > +  required:
> > +    - clocks
> > +    - resets
> > +    - power-domains
> > +
> > +else:
> > +  properties:
> > +    '#interrupt-cells':
> > +      const: 1
> > +
> >  additionalProperties: false
> >
> >  examples:
> > --
> > 2.25.1
> >
> >