linux-kernel - RE: [RFC net-next v2 4/5] net: phy: introducing support for DWC xPCS logics for EHL & TGL

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Date:   Fri, 6 Sep 2019 13:28:32 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Ong Boon Leong <boon.leong.ong@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "weifeng.voon@...el.com" <weifeng.voon@...el.com>
Subject: RE: [RFC net-next v2 4/5] net: phy: introducing support for DWC xPCS
 logics for EHL & TGL

From: Ong Boon Leong <boon.leong.ong@...el.com>
Date: Aug/28/2019, 18:47:21 (UTC+00:00)

> xPCS is DWC Ethernet Physical Coding Sublayer that can be integrated with
> Ethernet MAC controller and acts as converter between GMII and SGMII. 

You have to be careful here because xPCS supports much more than these 
interfaces and speeds.

I would implement this thinking about the future integrations and 
leaving margin for more speeds.

As for this being a converter I'm not sure about the implementation 
logic because sometimes you can have a setup like:

MAC <-> xPCS <-> SERDES <-> SFP

SERDES and SFP may not require configuration nor even have MDIO access 
so in my view the "PHY" would then be the xPCS, no ?

---
Thanks,
Jose Miguel Abreu