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

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Message-ID: <9291f271-eafe-4f65-aa08-3c6cb4236f64@lunn.ch>
Date: Sun, 13 Jul 2025 19:05:59 +0200
From: Andrew Lunn <andrew@...n.ch>
To: ChunHao Lin <hau@...ltek.com>
Cc: hkallweit1@...il.com, nic_swsd@...ltek.com, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] r8169: add quirk for RTL8116af SerDes

On Fri, Jul 11, 2025 at 11:44:12AM +0800, ChunHao Lin wrote:
> RTL8116af is a variation of RTL8168fp. It uses SerDes instead of PHY.
> But SerDes status will not reflect to PHY. So it needs quirk to help
> to reflect SerDes status during PHY read.

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?

	Andrew