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Date:   Mon, 08 Aug 2022 07:31:20 +0200
From:   Kurt Kanzenbach <>
To:     Vladimir Oltean <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>, Andrew Lunn <>,
        Vivien Didelot <>,
        Florian Fainelli <>,
        Vladimir Oltean <>,
        Rob Herring <>,
        Krzysztof Kozlowski <>,
        Oleksij Rempel <>,
        Christian Marangi <>,
        John Crispin <>,
        Mans Rullgard <>,
        Arun Ramadoss <>,
        Woojung Huh <>,,
        Claudiu Manoil <>,
        Alexandre Belloni <>,
        George McCollister <>,
        DENG Qingfang <>,
        Sean Wang <>,
        Landen Chao <>,
        Matthias Brugger <>,
        Hauke Mehrtens <>,
        Martin Blumenstingl <>,
        Aleksander Jan Bajkowski <>,
        Alvin Šipraga <>,
        Luiz Angelo Daros de Luca <>,
        Linus Walleij <>,
        Pawel Dembicki <>,
        Clément Léger <>,
        Geert Uytterhoeven <>,
        Russell King <>,
        Marek Behún <>,
        Marcin Wojtas <>, Marek Vasut <>,
Subject: Re: [RFC PATCH v3 net-next 02/10] dt-bindings: net: dsa: hellcreek:
 add missing CPU port phy-mode/fixed-link to example

On Sat Aug 06 2022, Vladimir Oltean wrote:
> Looking at hellcreek_phylink_get_caps(), I see that depending on whether
> is_100_mbits is set, speeds of 1G or of 100M will be advertised. The
> de1soc_r1_pdata sets is_100_mbits to true.
> The PHY modes declared in the capabilities are MII, RGMII and GMII. GMII
> doesn't support 100Mbps, and as for RGMII, it would be a bit implausible
> to me to support this PHY mode but limit it to only 25 MHz. So I've
> settled on MII as a phy-mode in the example, and a fixed-link of
> 100Mbps.
> As a side note, there exists such a thing as "rev-mii", because the MII
> protocol is asymmetric, and "mii" is the designation for the MAC side
> (expected to be connected to a PHY), and "rev-mii" is the designation
> for the PHY side (expected to be connected to a MAC). I wonder whether
> "mii" or "rev-mii" should actually be used here, since this is a CPU
> port and presumably connected to another MAC.
> Signed-off-by: Vladimir Oltean <>

Reviewed-by: Kurt Kanzenbach <>

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