netdev - RE: [PATCH net-next v5] r8169: add support for rtl8168h(revid 0x2a) + rtl8211fs fiber application

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Date:   Fri, 9 Dec 2022 15:29:29 +0000
From:   Hau <hau@...ltek.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>, Andrew Lunn <andrew@...n.ch>
Subject: RE: [PATCH net-next v5] r8169: add support for rtl8168h(revid 0x2a) + rtl8211fs fiber application

> 
> OK, I think I get a better idea of your setup.
> So it seems RTL8211FS indeed acts as media converter. Link status on MDI
> side of RTL8211FS reflects link status on fiber/serdes side.
> RTL8168H PHY has no idea whether it's connected to RJ45 magnetics or to the
> MDI side of a RTL8211FS.
> 
> I think for configuring RTL8211FS you have two options:
> 1. Extend the Realtek PHY driver to support RTL8211FS fiber mode 2.
> Configure RTL8211FS from userspace (phytool, mii-tool, ..). However to be
> able to do this you may need to add a dummy netdevice
>    that RTL8211FS is attached to. When going with this option it may be better
> to avoid phylib taking control of RTL8211FS.
>    This can be done by setting the phy_mask of the bit-banged mii_bus.

Thanks for your advaice.
Is that possible for us to register a PHY fixup function(phy_register_fixup()) to setup rtl8211fs instead of setup it in PHY driver?

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