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

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Message-ID: <20200608145737.GG1006885@lunn.ch>
Date:   Mon, 8 Jun 2020 16:57:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sascha Hauer <s.hauer@...gutronix.de>,
        Russell King <rmk+kernel@...linux.org.uk>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: ethernet: mvneta: add support for 2.5G DRSGMII mode

On Mon, Jun 08, 2020 at 09:47:16AM +0200, Sascha Hauer 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.
> 
> It was successfully tested on a MV78460 connected to a FPGA.

Hi Sascha

Is this really overclocked SGMII, or 2500BaseX? How does it differ
from 2500BaseX, which mvneta already supports?

Also, does comphy need extensions to support this?

      Andrew