linux-kernel - Re: [PATCH v2 7/9] riscv: dts: add initial support for the SiFive FU740-C000 SoC

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Date:   Fri, 16 Jul 2021 14:49:39 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Yash Shah <yash.shah@...ive.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [PATCH v2 7/9] riscv: dts: add initial support for the SiFive
 FU740-C000 SoC

Hi Yash,

On Tue, Dec 8, 2020 at 5:57 AM Yash Shah <yash.shah@...ive.com> wrote:
> Add initial support for the SiFive FU540-C000 SoC. FU740-C000 is built
> around the SiFIve U7 Core Complex and a TileLink interconnect.
>
> This file is expected to grow as more device drivers are added to the
> kernel.
>
> Signed-off-by: Yash Shah <yash.shah@...ive.com>

Thanks for your patch, which became commit 57985788158a5a6b ("riscv:
dts: add initial support for the SiFive FU740-C000 SoC").

> --- /dev/null
> +++ b/arch/riscv/boot/dts/sifive/fu740-c000.dtsi
> @@ -0,0 +1,293 @@

> +       cpus {
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               cpu0: cpu@0 {
> +                       compatible = "sifive,bullet0", "riscv";

I'm wondering why you're using

    compatible = "sifive,bullet0", "riscv";

According to your own commit 75e6d7248efccc2b ("dt-bindings: riscv:
Update DT binding docs to support SiFive FU740 SoC"), it should be

    compatible = "sifive,u74-mc", "riscv";

instead.

Likewise, the older arch/riscv/boot/dts/sifive/fu540-c000.dtsi is using

    compatible = "sifive,e51", "sifive,rocket0", "riscv";

and

    compatible = "sifive,u54-mc", "sifive,rocket0", "riscv";

but according to the DT bindings the rocket part should not be present.

Is there any specific reason for that?
Should the DT bindings and/or the DTS files be fixed?

Thanks!

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