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 20:04:48 +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>,
        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>
Subject: Re: [PATCH v2 10/10] ARM: dts: r8a7742-iwg21d-q7: Add support for
 iWave G21D-Q7 board based on RZ/G1H

Hi Geert,

On Fri, Jun 5, 2020 at 1:52 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> 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.
>
I took a closer look at the schematics, SCIFA2 is connected to the
debug interface similarly on G1M where SCIF0 is connected to the debug
interface.

I will send the user guide privately which should clarify the serial
interfaces on the board.

Cheers,
--Prabhakar


> > +               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