netdev - Re: [PATCH v4 net-next 3/8] net: phy: bcm84881: move the in-band capability check where it belongs

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Date:   Tue, 22 Nov 2022 14:24:51 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     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>,
        Sean Anderson <sean.anderson@...o.com>,
        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 3/8] net: phy: bcm84881: move the in-band
 capability check where it belongs

On Tue, Nov 22, 2022 at 09:38:43AM +0000, Russell King (Oracle) wrote:
> 88E1111 is the commonly used accessible PHY on gigabit SFPs, as this
> PHY implements I2C access natively.

As a side question, I suppose it would be possible to put PHYs on copper
SFP modules even if they don't natively implement I2C access. In that case,
if configuration from the host is at all available, how does that happen,
is there some sort of protocol translator (I2C -> MDIO) on the module?
Do you know of any part number for an I2C controlled MDIO controller?