netdev - Re: [PATCH RFC net-next 6/7] net: dsa: mv88e6xxx: provide software node for default settings

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Message-ID: <8133635f-8d19-4899-83e2-0bf9b7b644b2@lunn.ch>
Date:   Wed, 22 Mar 2023 22:40:26 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH RFC net-next 6/7] net: dsa: mv88e6xxx: provide software
 node for default settings

> What I'm trying to find out is what you think the behaviour should be
> in this case. Are you suggesting we should fall back to what we do now
> which is let the driver do it internally without phylink.
> 
> The problem is that if we don't go down the phylink route for everything
> then we /can't/ convert mv88e6xxx to phylink_pcs, because the "serdes"
> stuff will be gone, and the absence of phylink will mean those won't be
> called e.g. to power up the serdes.

I'm pretty sure non-DT systems have never used SERDES. They are using
a back to back PHY, or maybe RGMII. So long as this keeps working, we
can convert to phylink.

And i have such a amd64 system, using back to back PHYs so i can test
it does not regress.

    Andrew