linux-kernel - Re: [PATCH 3/4] ARM: dts: r8a7742-iwg21d-q7: Add can0 support to carrier board

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Date:   Fri, 4 Sep 2020 18:17:49 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] ARM: dts: r8a7742-iwg21d-q7: Add can0 support to
 carrier board

Hi Geert,

Thank you for the review.

On Thu, Sep 3, 2020 at 1:14 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Tue, Aug 25, 2020 at 6:28 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > This patch enables CAN0 interface exposed through connector J20 on the
> > carrier board.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Chris Paterson <Chris.Paterson2@...esas.com>
>
> According to my schematics, the CAN port on J20 has its signals named
> CAN0_[RT]XD on the carrier board, but connected to CAN1[RT]X (GP4_[67])
> on the SoM.
>
> Or am I looking at the wrong file?
>
You are correct, I misplaced the node from the carrier board, will post a v2.

Cheers,
Prabhakar

> > --- a/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
> > +++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
> > @@ -198,6 +198,13 @@
> >         };
> >  };
> >
> > +&can0 {
>
> can1
>
> > +       pinctrl-0 = <&can0_pins>;
>
> can1_pins
>
> > +       pinctrl-names = "default";
> > +
> > +       status = "okay";
> > +};
> > +
> >  &cmt0 {
> >         status = "okay";
> >  };
>
> > @@ -287,6 +303,11 @@
> >                 function = "tpu0";
> >         };
> >
> > +       can0_pins: can0 {
> > +               groups = "can0_data_d";
>
> can1_data_b
>
> > +               function = "can0";
> > +       };
> > +
> >         i2c2_pins: i2c2 {
> >                 groups = "i2c2_b";
> >                 function = "i2c2";
>
> 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