linux-kernel - Re: [RFC RESEND PATCH 0/2] RZ/G2UL separate out SoC specific parts

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Date:   Tue, 25 Oct 2022 17:15:02 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, linux-arm-kernel@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org,
        Conor Dooley <conor.dooley@...rochip.com>,
        Samuel Holland <samuel@...lland.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: [RFC RESEND PATCH 0/2] RZ/G2UL separate out SoC specific parts

Hi Geert.

Thank you for the review.

On Tue, Oct 25, 2022 at 1:42 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> (now replying to the latest version)
>
> On Mon, Oct 17, 2022 at 11:12 AM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > This patch series aims to split up the RZ/G2UL SoC DTSI into common parts
> > so that this can be shared with the RZ/Five SoC.
> >
> > Implementation is based on the discussion [0] where I have used option#2.
> >
> > The Renesas RZ/G2UL (ARM64) and RZ/Five (RISC-V) have almost the same
> > identical blocks to avoid duplication a base SoC dtsi (r9a07g043.dtsi) is
> > created which will be used by the RZ/G2UL (r9a07g043u.dtsi) and RZ/Five
> > (r9a07g043F.dtsi)
>
> Thanks for your series!
>
> > Sending this as an RFC to get some feedback.
> >
> > r9a07g043f.dtsi will look something like below:
> >
> > #include <dt-bindings/interrupt-controller/irq.h>
> >
> > #define SOC_PERIPHERAL_IRQ_NUMBER(nr)   (nr + 32)
> > #define SOC_PERIPHERAL_IRQ(nr, na)      SOC_PERIPHERAL_IRQ_NUMBER(nr) na
>
> Originally, when I assumed incorrectly that dtc does not support
> arithmetic, I used "nr" and "na" in the macro I proposed to mean RISC-V
> ("r") resp. ARM ("a") interrupt number.  Apparently the names stuck,
> although the second parameter now has a completely different meaning ;-)
>
> However, as the NCEPLIC does support interrupt flags, unlike the SiFive
> PLIC, there is no need to have the flags parameter in the macro.
>
> Moreover,  it looks like the SOC_PERIPHERAL_IRQ_NUMBER()
> intermediate is not needed, so you can just write:
>
>     #define SOC_PERIPHERAL_IRQ(nr)  (nr + 32)
>
Agreed, I'll change it as per your suggestion and send a v2.

Cheers,
Prabhakar