linux-kernel - Re: [PATCH v2 10/10] ARM: dts: r8a7742-iwg21d-q7: Add support for iWave G21D-Q7 board based on RZ/G1H

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Date:   Fri, 5 Jun 2020 14:51:52 +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>,
        Vinod Koul <vkoul@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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>,
        dmaengine <dmaengine@...r.kernel.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v2 10/10] ARM: dts: r8a7742-iwg21d-q7: Add support for
 iWave G21D-Q7 board based on RZ/G1H

Hi Prabhakar,

On Sun, May 3, 2020 at 11:47 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Add support for iWave RainboW-G21D-Qseven board based on RZ/G1H.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>

> --- /dev/null
> +++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
> @@ -0,0 +1,37 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree Source for the iWave-RZ/G1H Qseven board
> + *
> + * Copyright (C) 2020 Renesas Electronics Corp.
> + */
> +
> +/dts-v1/;
> +#include "r8a7742-iwg21m.dtsi"
> +
> +/ {
> +       model = "iWave Systems RainboW-G21D-Qseven board based on RZ/G1H";
> +       compatible = "iwave,g21d", "iwave,g21m", "renesas,r8a7742";
> +
> +       aliases {
> +               serial2 = &scifa2;
> +       };
> +
> +       chosen {
> +               bootargs = "ignore_loglevel root=/dev/mmcblk0p1 rw rootwait";
> +               stdout-path = "serial2:115200n8";
> +       };
> +};
> +
> +&pfc {
> +       scifa2_pins: scifa2 {
> +               groups = "scifa2_data_c";

Upon second look, I think this group is wrong.  While labeled SCIFA2 in
the SOM schematics, these signals seem to be connected to a debugging
interface.

The real UART2 seems to be present on the camera daughter board.  Those
signals are labeled "SCIFA2" in the camera board schematics, but "SCIF2"
in the SOM schematics.  This is OK, as "scif2_data" and "scifa2_data"
share the same pins, so you can choose either SCIF2 or SCIFA2 to drive
them.

If I'm right, please change the group, and move all serial2 descriptions
to the camera board DTS.

> +               function = "scifa2";
> +       };
> +};
> +
> +&scifa2 {
> +       pinctrl-0 = <&scifa2_pins>;
> +       pinctrl-names = "default";
> +
> +       status = "okay";
> +};

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