linux-kernel - Re: [PATCH v2 4/4] can: sun4i_can: Add support for the Allwinner D1

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Message-ID: <CAMuHMdV2m54UAH0X2dG7stEg=grFihrdsz4+o7=_DpBMhjTbkw@mail.gmail.com>
Date:   Tue, 22 Aug 2023 14:30:16 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     John Watts <contact@...kia.org>
Cc:     linux-sunxi@...ts.linux.dev,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 4/4] can: sun4i_can: Add support for the Allwinner D1

Hi John,

On Sat, Jul 22, 2023 at 12:18 AM John Watts <contact@...kia.org> wrote:
> The controllers present in the D1 are extremely similar to the R40
> and require the same reset quirks, but An extra quirk is needed to support
> receiving packets.
>
> Signed-off-by: John Watts <contact@...kia.org>

Thanks for your patch, which is now commit 8abb95250ae6af2d ("can:
sun4i_can: Add support for the Allwinner D1") in linux-can-next/master.

> --- a/drivers/net/can/Kconfig
> +++ b/drivers/net/can/Kconfig
> @@ -185,10 +185,10 @@ config CAN_SLCAN
>
>  config CAN_SUN4I
>         tristate "Allwinner A10 CAN controller"
> -       depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST
> +       depends on MACH_SUN4I || MACH_SUN7I || RISCV || COMPILE_TEST

This makes this question pop up when configuring a kernel for any RISC-V
platform, not just for Allwinner RISC-V platforms.

In comparison, drivers/clk/sunxi-ng/Kconfig does have some

    depends on MACH_SUN<foo>I || RISCV || COMPILE_TEST

but these are gated by ARCH_SUNXI at the top of the file.

I'm not sure what's the best way to fix this:
  - Replace RISCV by ARCH_SUNXI?
    This would expose it on more ARM sun<foo>i platforms, making the
    MACH_SUN4I || MACH_SUN7I superfluous?
  - Replace RISCV by RISCV && ARCH_SUNXI?

Thanks for your comments!

>         help
>           Say Y here if you want to use CAN controller found on Allwinner
> -         A10/A20 SoCs.
> +         A10/A20/D1 SoCs.
>
>           To compile this driver as a module, choose M here: the module will
>           be called sun4i_can.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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