linux-kernel - Re: [PATCH v2 4/8] RISC-V: Kconfig.socs: Add Renesas RZ/Five SoC kconfig option

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Date:   Thu, 18 Aug 2022 19:19:18 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Conor Dooley <Conor.Dooley@...rochip.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 4/8] RISC-V: Kconfig.socs: Add Renesas RZ/Five SoC
 kconfig option

Hi Geert,

Thank you for the review.

On Thu, Aug 18, 2022 at 4:16 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Aug 15, 2022 at 5:16 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > Introduce SOC_RENESAS_RZFIVE config option to enable Renesas RZ/Five
> > (R9A07G043) SoC, along side also add ARCH_RENESAS config option as most
> > of the Renesas drivers depend on this config option.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> The technical part LGTM, so
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> > --- a/arch/riscv/Kconfig.socs
> > +++ b/arch/riscv/Kconfig.socs
> > @@ -80,4 +80,18 @@ config SOC_CANAAN_K210_DTB_SOURCE
> >
> >  endif # SOC_CANAAN
> >
> > +config ARCH_RENESAS
>
> We definitely want ARCH_RENESAS, as it serves as a gatekeeper for
> Kconfig options for IP cores found on Renesas ARM and RISC-V SoCs.
>
Agreed, or else we will end up touching too many Kconfig files.

> > +       bool
> > +       select GPIOLIB
> > +       select PINCTRL
> > +       select SOC_BUS
> > +
> > +config SOC_RENESAS_RZFIVE
>
> Do we need this symbol? You could as well make ARCH_RENESAS above
> visible, and defer the actual SoC selection to ARCH_R9A07G043 in
> drivers/soc/renesas/Kconfig[1].
>
I think we could drop it and just defer the actual SoC selection to
ARCH_R9A07G043 as you said.

> I don't know what is the policy on RISC-V. ARM64 has a "single-symbol
> in arch/arm64/Kconfig.platforms"-policy, so we handle SoC selection
> in drivers/soc/renesas/Kconfig, and that is fine, as it avoids merge
> conflicts.
>
Agreed.

@Conor - Does the above sound OK?

Cheers,
Prabhakar