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

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Message-ID: <ab3f4c46d0a7489597150dc47a5211cb@realtek.com>
Date:   Fri, 22 Jul 2022 15:21:42 +0000
From:   Hau <hau@...ltek.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     nic_swsd <nic_swsd@...ltek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next] r8169: add support for rtl8168h(revid 0x2a) + rtl8211fs fiber application

> On 21.07.2022 16:45, Chunhao Lin wrote:
> > rtl8168h(revid 0x2a) + rtl8211fs is for fiber related application.
> > rtl8168h will control rtl8211fs via its eeprom or gpo pins.
> 
> RTL8168h has an integrated PHY, how is it with rev 0x2a? Can this version be
> used with an external PHY only?
> And how about the case that somebody combines this chip version with
> another PHY that supports fiber? It seems the code makes the assumption
> that rev2a is always coupled with an external RTL8211FS.
> 
> Are there any realworld devices that use RTL8168H with fiber?
> 
RTL8168h with revid 0x2a is always coupled with an external  RTL8211FS. Right now there is no plan for it to connect to another external PHY.
RTL8168H with revid 0x15 and it with revid 0x2a are the same chip. But revid 0x2a is used for identify this application. 
Following is the diagram for this application.

+-------------+  Ethernet Cable  +-------------+
|                      +-------------------- +                      |
|                      |  MDIO(EEDN)      |                       |fiber
|  rtl8168h   +----------------- ---+  rtl8211fs   +------+
|                      |  MDC(EECS)         |                       |
|                      +--------------------+                       |
+-------------+                                 +--------------+

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