linux-kernel - Re: [PATCH 13/14] arm64: dts: renesas: rzg3s-smarc-som: Enable Ethernet interfaces

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Message-ID: <CAMuHMdXs9tKo9W31f5OybNR51a_i99Lyx=wHe0GLrADN_8KZTg@mail.gmail.com>
Date:   Wed, 6 Dec 2023 12:22:13 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Claudiu <claudiu.beznea@...on.dev>
Cc:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux@...linux.org.uk, magnus.damm@...il.com,
        mturquette@...libre.com, sboyd@...nel.org,
        linus.walleij@...aro.org, p.zabel@...gutronix.de, arnd@...db.de,
        m.szyprowski@...sung.com, alexandre.torgue@...s.st.com, afd@...com,
        broonie@...nel.org, alexander.stein@...tq-group.com,
        eugen.hristev@...labora.com, sergei.shtylyov@...il.com,
        prabhakar.mahadev-lad.rj@...renesas.com,
        biju.das.jz@...renesas.com, linux-renesas-soc@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 13/14] arm64: dts: renesas: rzg3s-smarc-som: Enable
 Ethernet interfaces

Hi Claudiu,

Thanks for your patch!

On Mon, Nov 20, 2023 at 8:03 AM Claudiu <claudiu.beznea@...on.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> RZ/G3S Smarc Module has Ethernet PHYs (KSZ9131) connected to each Ethernet
> IP. For this add proper DT bindings to enable the Ethernet communication
> though these PHYs.
>
> The interface b/w PHYs and MACs is RGMII. The skew settings were set to
> zero as based on phy-mode (rgmii-id) the KSZ9131 driver enables internal
> DLL which adds 2ns delay b/w clocks (TX/RX) and data signals.

So shouldn't you just use phy-mode "rgmii" instead?

> Different pin settings were applied to TXC, TX_CTL compared with the rest
> of the RGMII pins to comply with requirements for these pins imposed by
> HW manual of RZ/G3S (see chapters "Ether Ch0 Voltage Mode Control
> Register (ETH0_POC)", "Ether Ch1 Voltage Mode Control Register (ETH1_POC)",
> for power source selection, "Ether MII/RGMII Mode Control Register
> (ETH_MODE)" for output-enable and "Input Enable Control Register (IEN_m)"
> for input-enable configurations).
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

> --- a/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
> +++ b/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
> @@ -25,7 +25,10 @@ / {
>
>         aliases {
>                 mmc0 = &sdhi0;
> -#if !SW_SD2_EN
> +#if SW_SD2_EN

Cfr. my comment on [PATCH 11/14], this looks odd...

> +               eth0 = &eth0;
> +               eth1 = &eth1;
> +#else
>                 mmc2 = &sdhi2;
>  #endif
>         };
> @@ -81,6 +84,64 @@ vcc_sdhi2: regulator2 {
>         };
>  };
>
> +#if SW_SD2_EN

Likewise.

> +&eth0 {
> +       pinctrl-0 = <&eth0_pins>;
> +       pinctrl-names = "default";
> +       phy-handle = <&phy0>;
> +       phy-mode = "rgmii-id";
> +       #address-cells = <1>;
> +       #size-cells = <0>;

#{address,size}-cells should be in the SoC-specific .dtsi.
Same for eth1.

> +       status = "okay";

The rest LGTM.

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