linux-kernel - Re: [PATCH v2 1/2] riscv: dts: microchip: Use 'local-mac-address' for emac1

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Date:   Tue, 24 Aug 2021 17:41:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bin Meng <bmeng.cn@...il.com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Conor Dooley <Conor.Dooley@...rochip.com>,
        Atish Patra <atish.patra@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Bin Meng <bin.meng@...driver.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 1/2] riscv: dts: microchip: Use 'local-mac-address' for emac1

Hi Bin,

On Wed, Aug 4, 2021 at 2:30 PM Bin Meng <bmeng.cn@...il.com> wrote:
> From: Bin Meng <bin.meng@...driver.com>
>
> Per the DT spec, 'local-mac-address' is used to specify MAC address
> that was assigned to the network device, while 'mac-address' is used
> to specify the MAC address that was last used by the boot program,
> and shall be used only if the value differs from 'local-mac-address'
> property value.
>
> Signed-off-by: Bin Meng <bin.meng@...driver.com>
> Reviewed-by: conor dooley <conor.dooley@...rochip.com>

Thanks for your patch!

> ---
>
> (no changes since v1)
>
>  arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> index 0659068b62f7..a9c558366d61 100644
> --- a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> @@ -317,7 +317,7 @@ emac1: ethernet@...12000 {
>                         reg = <0x0 0x20112000 0x0 0x2000>;
>                         interrupt-parent = <&plic>;
>                         interrupts = <70 71 72 73>;
> -                       mac-address = [00 00 00 00 00 00];
> +                       local-mac-address = [00 00 00 00 00 00];

Is there any point in providing an all-zeros MAC address at all?
Can't it just be removed?

>                         clocks = <&clkcfg 5>, <&clkcfg 2>;
>                         status = "disabled";
>                         clock-names = "pclk", "hclk";

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