linux-kernel - Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

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Date:   Tue, 4 Feb 2020 18:43:18 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is
 up without PHY

> There, there is one MAC, but there are multiple different PCS - one
> for SGMII and 1000base-X, another for 10G, another for 25G, etc.
> These PCS are accessed via a MDIO adapter embedded in each of the
> MAC hardware blocks.

Hi Russell

Marvell mv88e6390X switches are like this is a well. There is a PCS
for SGMII and 1000Base-X, and a second one for 10G. And it dynamically
swaps between them depending on the port mode, the so called cmode.

So a generic solution is required, and please take your time to build
one.

> It's not production-ready yet, but I will continue working on it
> over the coming week.

I'm happy to test when you are ready.

Thanks for working on this,

       Andrew