linux-kernel - Re: [PATCH v18 10/10] ARM: dts: Add Sunplus SP7021-Demo-V3 board device tree

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Date:   Tue, 14 Jun 2022 12:42:01 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Qin Jian <qinjian@...lus1.com>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        SoC Team <soc@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v18 10/10] ARM: dts: Add Sunplus SP7021-Demo-V3 board
 device tree

 beOn Tue, Jun 14, 2022 at 10:31 AM Qin Jian <qinjian@...lus1.com> wrote:
>
> Add the basic support for Sunplus SP7021-Demo-V3 board.
>
> Signed-off-by: Qin Jian <qinjian@...lus1.com>
> ---
> Fix the comments from Krzysztof.

I'll wait for a final Ack from Krzysztof before applying this.


A few more details I noticed:


> +/ {
> +       compatible = "sunplus,sp7021";
> +       model = "Sunplus SP7021";
> +
> +       aliases {
> +               serial0 = &uart0;
> +               serial1 = &uart1;
> +               serial2 = &uart2;
> +               serial3 = &uart3;
> +               serial4 = &uart4;
> +       };

Some of these are disabled, presumably because they are not
actually connected on all boards. Better move the aliases to the .dts file
and only list the ports that are in fact used, using the numbering that
matches the labels on the board, not the numbers inside of the SoC

> +
> +       soc {
> +               compatible = "simple-bus";
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +               interrupt-parent = <&intc>;
> +
> +               intc: interrupt-controller@...00780 {
> +                       compatible = "sunplus,sp7021-intc";
> +                       reg = <0x9c000780 0x80>, <0x9c000a80 0x80>;
> +                       interrupt-controller;
> +                       #interrupt-cells = <2>;
> +               };

All child nodes below /soc have registers in the 0x9c000000 range. I would
suggest you use a matching 'ranges' property to translate these into a
zero-based
address like

/soc {
       ranges = <0 0x9c000000 0x10000>;

      interrupt-controller@780 {
             reg = <0x780 0x80>, <0xa80 0x80>;
             ...
      };
};

> +               clkc: clock-controller@...00004 {
> +                       compatible = "sunplus,sp7021-clkc";
> +                       reg = <0x9c000004 0x28>,
> +                             <0x9c000200 0x44>,
> +                             <0x9c000268 0x04>;
> +                       clocks = <&extclk>;
> +                       #clock-cells = <1>;
> +               };
> +
> +               rstc: reset@...00054 {
> +                       compatible = "sunplus,sp7021-reset";
> +                       reg = <0x9c000054 0x28>;
> +                       #reset-cells = <1>;
> +               };


Maybe sort the nodes by address, or possibly by name.

       Arnd