netdev - RE: [PATCH net-next 4/7] net: pcs: xpcs: adapt Wangxun NICs for SGMII mode

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Date: Mon, 31 Jul 2023 09:47:40 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Andrew Lunn'" <andrew@...n.ch>
Cc: "'Russell King \(Oracle\)'" <linux@...linux.org.uk>,
	<netdev@...r.kernel.org>,
	<hkallweit1@...il.com>,
	<Jose.Abreu@...opsys.com>,
	<mengyuanlou@...-swift.com>
Subject: RE: [PATCH net-next 4/7] net: pcs: xpcs: adapt Wangxun NICs for SGMII mode

On Friday, July 28, 2023 6:24 PM, : Andrew Lunn wrote:
> > There is a question about I2C MII read ops. I see that PHY in SFP-RJ45 module
> > is read by i2c_mii_read_default_c22(), but it limits the msgs[0].len=1.
> >
> > A description in  the SFP-RJ45 datasheet shows:
> 
> Please give a link to this document.

https://www.alldatasheet.com/datasheet-pdf/pdf/465165/AVAGO/ABCU-5710RZ.html

> 
> The problem with copper PHYs embedded inside SFPs is that there is no
> standardised protocol to talk to them. Each PHY vendor does their own
> thing. At the moment, two different protocols are supported, ROLLBALL
> and the default protocol. It might be another protocol needs to be
> added to support the SFP you are testing with. So we need to see the
> protocol specification.
> 
>       Andrew
>