linux-kernel - Re: [PATCH v2 1/9] dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Document RZ/G2UL SoC

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Date:   Thu, 22 Dec 2022 11:53:40 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 1/9] dt-bindings: interrupt-controller:
 renesas,rzg2l-irqc: Document RZ/G2UL SoC

Hi Geert,

On Thu, Dec 22, 2022 at 8:19 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Wed, Dec 21, 2022 at 10:06 PM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> > On Wed, Dec 21, 2022 at 12:37 PM Geert Uytterhoeven
> > <geert@...ux-m68k.org> wrote:
> > > On Wed, Dec 21, 2022 at 1:03 AM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > >
> > > > Document RZ/G2UL (R9A07G043U) IRQC bindings. The IRQC block on RZ/G2UL SoC
> > > > is almost identical to one found on the RZ/G2L SoC the only difference
> > > > being it can support BUS_ERR_INT for which it has additional registers.
> > > > Hence new generic compatible string "renesas,rzg2ul-irqc" is added for
> > > > RZ/G2UL SoC.
> > > >
> > > > Now that we have additional interrupt for RZ/G2UL and RZ/Five SoC
> > > > interrupt-names property is added so that we can parse them based on
> > > > names.
> > > >
> > > > While at it updated the example node to four spaces and added
> > > > interrupt-names property.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > ---
> > > > v1- > v2
> > > > * Dropped RB tags
> > > > * Added generic compatible string for rzg2ul
> > > > * Added interrupt-names
> > > > * Added checks for RZ/G2UL to make sure interrupts are 42 and interrupt-names
> > > > * Updated example node with interrupt-names
> > > > * Used 4 spaces for example node
> > >
> > > Thanks for the update!
> > >
> > > > --- a/Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
> > > > +++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
> > > > @@ -19,16 +19,19 @@ description: |
> > > >      - NMI edge select (NMI is not treated as NMI exception and supports fall edge and
> > > >        stand-up edge detection interrupts)
> > > >
> > > > -allOf:
> > > > -  - $ref: /schemas/interrupt-controller.yaml#
> > > > -
> > > >  properties:
> > > >    compatible:
> > > > -    items:
> > > > -      - enum:
> > > > -          - renesas,r9a07g044-irqc    # RZ/G2{L,LC}
> > > > -          - renesas,r9a07g054-irqc    # RZ/V2L
> > > > -      - const: renesas,rzg2l-irqc
> > > > +    oneOf:
> > > > +      - items:
> > > > +          - enum:
> > > > +              - renesas,r9a07g044-irqc    # RZ/G2{L,LC}
> > > > +              - renesas,r9a07g054-irqc    # RZ/V2L
> > > > +          - const: renesas,rzg2l-irqc
> > > > +
> > > > +      - items:
> > > > +          - enum:
> > > > +              - renesas,r9a07g043u-irqc   # RZ/G2UL
> > > > +          - const: renesas,rzg2ul-irqc
> > >
> > > I'm not sure it's worth splitting into RZ/G2L and RZ/G2UL alike
> > > variants, and adding the "renesas,rzg2ul-irqc" family-specific
> > > compatible value.  You can easily handle the difference by the presence
> > > (or absence) of the "bus-err" interrupt source.
> > >
> > Yes, the only reason to add "renesas,rzg2ul-irqc" is to differentiate
> > RZ/Five later. I have not worked out on how this driver will work in
> > case of RZ/Five yet with PLIC (as we sifive plic driver as a chained
> > handler and then we have the RISC-V intc driver). If you insist I can
> > drop it for now and then later when we add RZ/FIve we could add a
> > check for compat string maybe?
>
> Given you already use "renesas,r9a07g043u-irqc" (note the "u") here,
> you will have "renesas,r9a07g043f-irqc" to handle the (minor)
> differences.
>
Ok, so I'll revert back to the previous version of the patch and still
add the interrupt names.

Cheers,
Prabhakar