linux-kernel - RE: [PATCH net-next] r8169: add quirk for RTL8116af SerDes

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Message-ID: <50df9352e81e4688b917072949b2ee4c@realtek.com>
Date: Mon, 14 Jul 2025 15:28:37 +0000
From: Hau <hau@...ltek.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "hkallweit1@...il.com" <hkallweit1@...il.com>,
        nic_swsd
	<nic_swsd@...ltek.com>,
        "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com"
	<edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next] r8169: add quirk for RTL8116af SerDes

> 
> Can you give us a few more details. What is on the other end of the SERDES?
> An SGMII PHY? An SFP cage? An Ethernet switch chip?
> 
> A quick search suggests it is used with an SFP cage. How is the I2C bus
> connected? What about GPIOs? Does the RTL8116af itself have GPIOs and an
> I2C bus?
> 
RTL8116af 's SERDES will connect to a SFP cage. It has GPIO and a I2C bus. But driver did not use it to access SFP cage.
Driver depends on mac io 0x6c (LinkStatus) to check link status.