linux-kernel - Re: [PATCH net-next 2/2] net: phy: broadcom: add 1000Base-X support for BCM54616S

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Message-ID: <20190730131719.GA28552@lunn.ch>
Date:   Tue, 30 Jul 2019 15:17:19 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Tao Ren <taoren@...com>, Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH net-next 2/2] net: phy: broadcom: add 1000Base-X support
 for BCM54616S

> Again, I don't think Linux has generic support for overwriting (or
> even describing) the operating mode of a PHY, although maybe that's a
> direction we would want to push the discussion towards. RGMII to
> copper, RGMII to fiber, SGMII to copper, copper to fiber (media
> converter), even RGMII to SGMII (RTL8211FS supports this) - lots of
> modes, and this is only for gigabit PHYs...

This is something Russell King has PHYLINK patches for, which have not
yet been merged. There are some boards which use a PHY as a media
converter, placed between the MAC and an SFP.

	   Andrew