linux-kernel - Re: [PATCH RFC 1/5] dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Document RZ/G2UL SoC

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Message-ID: <CA+V-a8uqQ2fK1UjRT864jyHdt6Z47V=iARSJC6B2M6Gikms=Eg@mail.gmail.com>
Date:   Fri, 18 Nov 2022 12:29:43 +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-gpio@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH RFC 1/5] dt-bindings: interrupt-controller:
 renesas,rzg2l-irqc: Document RZ/G2UL SoC

Hi Geert,

On Thu, Nov 17, 2022 at 10:54 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Nov 7, 2022 at 6:53 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Document RZ/G2UL (R9A07G043) IRQC bindings. The RZ/G2UL IRQC block is
> > identical to one found on the RZ/G2L SoC. No driver changes are
> > required as generic compatible string "renesas,rzg2l-irqc" will be
> > used as a fallback.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> > ---
> > Note, renesas,r9a07g043u-irqc is added we have slight difference's compared to RZ/Five
> > - G2UL IRQCHIP (hierarchical IRQ domain) -> GIC where as on RZ/Five we have PLIC (chained interrupt
> > domain) -> RISCV INTC
>
> I think this difference is purely a software difference, and abstracted
> in DTS through the interrupt hierarchy.
> Does it have any impact on the bindings?
>
> > - On the RZ/Five we have additional registers for IRQC block
>
> Indeed, the NMI/IRQ/TINT "Interruput" Mask Control Registers, thus
> warranting separate compatible values.
>
> > - On the RZ/Five we have BUS_ERR_INT which needs to be handled by IRQC
>
> Can you please elaborate? I may have missed something, but to me it
> looks like that is exactly the same on RZ/G2UL and on RZ/Five.
>
Now that we have to update the binding doc with the BUS_ERR_INT too,
do you think it would make sense to add interrupt-names too?

BUS_ERR_INT will have to be handled IRQC itself (i.e. IRQC will
register a handler for it).

Cheers,
Prabhakar