linux-kernel - Re: [PATCH] can: rcar: Update help description for CAN_RCAR

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Message-ID: <CAMuHMdWTtSrK1K9VHoxC+gnSKK82wHx5UyN66rpvnpfm_r7sVQ@mail.gmail.com>
Date:   Mon, 4 Jan 2021 15:01:09 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Chris Paterson <Chris.Paterson2@...esas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-can@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] can: rcar: Update help description for CAN_RCAR_CANFD config

Hi Prabhakar,

On Mon, Jan 4, 2021 at 2:38 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Mon, Jan 4, 2021 at 10:51 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Thu, Dec 31, 2020 at 5:00 PM Lad Prabhakar
> > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > > The rcar_canfd driver supports R-Car Gen3 and RZ/G2 SoC's, update the
> > > description to reflect this.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > > --- a/drivers/net/can/rcar/Kconfig
> > > +++ b/drivers/net/can/rcar/Kconfig
> > > @@ -10,13 +10,13 @@ config CAN_RCAR
> > >           be called rcar_can.
> > >
> > >  config CAN_RCAR_CANFD
> > > -       tristate "Renesas R-Car CAN FD controller"
> > > +       tristate "Renesas R-Car Gen3 and RZ/G2 CAN FD controller"
> > >         depends on ARCH_RENESAS || ARM
> >
> > Not introduced by this patch, but the "|| ARM" looks strange to me.
> > Is this meant for compile-testing? Doesn't the driver compile on all
> > platforms (it does on m68k), so "|| COMPILE_TEST" is not appropriate?
> > Is the CAN FD controller present on some Renesas arm32 SoCs (but
> > not yet supported by this driver)?
> >
> Good catch. "|| ARM" was probably copied from CAN_RCAR config and I
> can confirm CAN-FD controller doesn't exist on R-Car Gen2 and RZ/G2

G1

> 32bit SoC's (but with a bit of google search RZ/A2M supports CAN-FD I
> am not sure if its the same controller tough), but said that there

Thanks for investigating. I knew about R-Car Gen2 and RZ/G1 not having
CAN-FD.

> shouldn't be any harm in replacing  "|| ARM" with "|| COMPILE_TEST"
> for both CAN_RCAR_CAN{FD}. What are your thoughts?

I'd go for "|| COMPILE_TEST".

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