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

From: "Russell King (Oracle)" <[email-masked]>
Date: Mon, 24 Jul 2023 11:34:34 +0100

On Mon, Jul 24, 2023 at 06:23:38PM +0800, Jiawen Wu wrote:
> Wangxun NICs support the connection with SFP to RJ45 module. In this case,
> PCS need to be configured in SGMII mode.
> 
> Accroding to chapter 6.11.1 "SGMII Auto-Negitiation" of DesignWare Cores
> Ethernet PCS (version 3.20a) and custom design manual, do the following
> configuration when the interface mode is SGMII.
> 
> 1. program VR_MII_AN_CTRL bit(3) [TX_CONFIG] = 1b (PHY side SGMII)
> 2. program VR_MII_AN_CTRL bit(8) [MII_CTRL] = 1b (8-bit MII)
> 3. program VR_MII_DIG_CTRL1 bit(0) [PHY_MODE_CTRL] = 1b

I'm confused by "PHY side SGMII" - what does this mean for the
transmitted 16-bit configuration word? Does it mean that _this_ side
is acting as if it were a PHY?

Thanks.

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