linux-kernel - Re: [PATCH v2 09/10] ARM: dts: r8a7742-iwg21m: Add iWave RZ/G1H Qseven SOM

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Date:   Mon, 4 May 2020 15:01:25 +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 09/10] ARM: dts: r8a7742-iwg21m: Add iWave RZ/G1H
 Qseven SOM

Hi Prabhakar,

On Sun, May 3, 2020 at 11:48 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Add support for iWave RZ/G1H Qseven System On Module.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>

Thanks for your patch!

> --- /dev/null
> +++ b/arch/arm/boot/dts/r8a7742-iwg21m.dtsi
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree Source for the iWave RZ/G1H Qseven SOM
> + *
> + * Copyright (C) 2020 Renesas Electronics Corp.
> + */
> +
> +#include "r8a7742.dtsi"
> +#include <dt-bindings/gpio/gpio.h>
> +
> +/ {
> +       compatible = "iwave,g21m", "renesas,r8a7742";
> +
> +       memory@...00000 {
> +               device_type = "memory";
> +               reg = <0 0x40000000 0 0x40000000>;
> +       };
> +
> +       memory@...000000 {
> +               device_type = "memory";
> +               reg = <2 0x00000000 0 0x20000000>;

According to the schematics, the second bank is also 1 GiB, so the
reg length should be 0x40000000.

> +       };

> +&pfc {
> +       mmc1_pins: mmc1 {
> +               groups = "mmc1_data4", "mmc1_ctrl";
> +               function = "mmc1";
> +       };
> +};
> +
> +&mmcif1 {
> +       pinctrl-0 = <&mmc1_pins>;
> +       pinctrl-names = "default";
> +
> +       vmmc-supply = <&reg_3p3v>;
> +       bus-width = <4>;
> +       non-removable;
> +       status = "okay";
> +};

The eMMC has an 8-bit data path.  Is there any specific reason you use
bus-width = <4>, and the "mmc1_data4" pin group?

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