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

From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Conor Dooley <Conor.Dooley@microchip.com>,
	Anup Patel <anup@brainfault.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Prabhakar <prabhakar.csengg@gmail.com>,
	Biju Das <biju.das.jz@bp.renesas.com>
Subject: Re: [PATCH v2 4/8] RISC-V: Kconfig.socs: Add Renesas RZ/Five SoC kconfig option
Date: Thu, 18 Aug 2022 17:16:19 +0200	[thread overview]
Message-ID: <CAMuHMdW29Q40hypWZ05KRj5cc=DY8XjnDwOPVw3kJPNUrnL0fA@mail.gmail.com> (raw)
In-Reply-To: <20220815151451.23293-5-prabhakar.mahadev-lad.rj@bp.renesas.com>

Hi Prabhakar,

On Mon, Aug 15, 2022 at 5:16 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.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@bp.renesas.com>

Thanks for your patch!

The technical part LGTM, so
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.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.

> +       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 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.

> +       bool "Renesas RZ/Five SoC"
> +       select ARCH_R9A07G043
> +       select ARCH_RENESAS
> +       select RESET_CONTROLLER
> +       help
> +         This enables support for Renesas RZ/Five SoC.
> +
>  endmenu # "SoC selection"

[1] https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel.git/commit/?h=renesas-drivers-for-v6.1&id=ebd0e06f3063cc2e3a689112904b29720579c6d2

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds