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

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Date:   Tue, 24 Jan 2017 09:34:18 +0100
From:   Jan Lübbe <jlu@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH] net: ethernet: mvneta: add support for 2.5G DRSGMII mode

Hi Andrew,

On Mo, 2017-01-23 at 19:18 +0100, Andrew Lunn wrote:
> On Mon, Jan 23, 2017 at 03:22:06PM +0100, Jan Luebbe wrote:
> > 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.
>
> So this sets the PHY to 2.5Gbps. What about the MAC? Currently,
> mvneta_adjust_link() knows about SPEED_1000 and SPEED_100. Does it now
> need to know about SPEED_2500? mvneta_ethtool_set_link_ksettings()?

It works without any other changes. ;)

Initially I looked at adding a SPEED_2500, but I wasn't sure which code
would need to handle the new value. Would the path from the ethtool
ioctl to the driver be enough (mvneta_ethtool_set_link_ksettings() as
you said)?

Regards,
Jan
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