netdev - Re: [PATCH] net: ethernet: mvneta: add support for 2.5G DRSGMII mode

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Message-Id: <20170125.123806.790914338952471404.davem@davemloft.net>
Date:   Wed, 25 Jan 2017 12:38:06 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jlu@...gutronix.de
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com,
        thomas.petazzoni@...e-electrons.com, f.fainelli@...il.com
Subject: Re: [PATCH] net: ethernet: mvneta: add support for 2.5G DRSGMII
 mode

From: Jan Luebbe <jlu@...gutronix.de>
Date: Mon, 23 Jan 2017 15:22:06 +0100

> The Marvell MVNETA Ethernet controller supports a 2.5 Gbps SGMII mode
> called DRSGMII.
> 
> This patch adds a corresponding phy-mode string 'drsgmii' and parses it
> from DT. The MVNETA then configures the SERDES protocol value
> accordingly.
> 
> It was successfully tested on a MV78460 connected to a FPGA.
> 
> Signed-off-by: Jan Luebbe <jlu@...gutronix.de>

I still haven't seen a sufficient explanation as to why this change
works without any explicit MAC programming changes to this driver.

That really needs to be explained before I will apply this patch.

Thanks.