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

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Date:   Thu, 3 Sep 2020 14:14:14 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     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>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 3/4] ARM: dts: r8a7742-iwg21d-q7: Add can0 support to
 carrier board

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?

> --- 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