netdev - Re: [PATCH v4 net-next 0/8] Let phylink manage in-band AN for the PHY

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Date:   Tue, 22 Nov 2022 13:09:10 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        UNGLinuxDriver@...rochip.com,
        bcm-kernel-feedback-list@...adcom.com,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Camelia Groza <camelia.groza@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Antoine Tenart <atenart@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Raag Jadav <raagjadav@...il.com>,
        Siddharth Vadapalli <s-vadapalli@...com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Marek Behun <marek.behun@....cz>
Subject: Re: [PATCH v4 net-next 0/8] Let phylink manage in-band AN for the PHY

On 11/22/22 12:59, Russell King (Oracle) wrote:
> On Tue, Nov 22, 2022 at 11:10:03AM -0500, Sean Anderson wrote:
>> So maybe we should do (PHY_AN_INBAND_ON | PHY_AN_INBAND_OFF) in that
>> case. That said, RGMII in-band is not supported by phylink (yet).
> 
> I think people use it - why do you think it isn't supportable?

Sorry, I forgot that support had been added recently.

--Sean

> Why would it need to be any different from something like SGMII? One
> can implement a "phylink_pcs" that responds appropriately when in RGMII
> mode (which I believe is what others have done.)
> 
> Note that Marvell net drivers always register a PCS no matter what
> interface mode is being used - I believe the hardware has the ability
> to read the RGMII in-band and in that case it's just the same
> registers that one has to read to get the status as SGMII.
>