netdev - Re: [RFC PATCH v3 net-next 02/10] dt-bindings: net: dsa: hellcreek: add missing CPU port phy-mode/fixed-link to example

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Date:   Mon, 08 Aug 2022 07:31:20 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     devicetree@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Christian Marangi <ansuelsmth@...il.com>,
        John Crispin <john@...ozen.org>,
        Mans Rullgard <mans@...sr.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        George McCollister <george.mccollister@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Aleksander Jan Bajkowski <olek2@...pl>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pawel Dembicki <paweldembicki@...il.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Marcin Wojtas <mw@...ihalf.com>, Marek Vasut <marex@...x.de>,
        linux-renesas-soc@...r.kernel.org
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 <vladimir.oltean@....com>

Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>

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