netdev - RE: [RFC] Support for SGMII 2500

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Date:   Tue, 28 Nov 2017 13:55:28 +0000
From:   Madalin-cristian Bucur <madalin.bucur@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Bhaskar Upadhaya <bhaskar.upadhaya@....com>
CC:     "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Shengzhou Liu <shengzhou.liu@....com>,
        York Sun <york.sun@....com>,
        "u-boot@...ts.denx.de" <u-boot@...ts.denx.de>,
        "Anji Jagarlmudi" <anji.jagarlmudi@....com>,
        Calvin Johnson <calvin.johnson@....com>,
        Poonam Aggrwal <poonam.aggrwal@....com>,
        "Prabhakar Kushwaha" <prabhakar.kushwaha@....com>
Subject: RE: [RFC] Support for SGMII 2500

> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@...n.ch]
> Sent: Tuesday, November 28, 2017 3:30 PM
> Subject: Re: [RFC] Support for SGMII 2500
> 
> On Tue, Nov 28, 2017 at 07:25:48AM +0000, Madalin-cristian Bucur wrote:
> > Hi,
> >
> > There is a disconnect between the SGMII 2500 support in u-boot and
> Linux.
> > Bhaskar is trying to add support for a SGMII interface working at
> 2.5Gbps
> > by using the PHY connection type "sgmii-2500" in the device tree:
> 
> Hi Madalin
> 
> What MAC and PHY are you using?
> 
> I did a quick search for SGMII 2.5, and all i keep coming across is
> 2500BASE-X. I just want to make sure you really do need SGMII at 2500,
> and not 2500BASE-X, which is already supported.
> 
> Thanks
> 	Andrew

Hi Andrew,

Bhaskar is working on enabling a PFE [1] MAC connected to an Aquantia AQR107 
PHY [2] on a LS1012AQDS board. Initially I've indicated 2500Base-X too, but it
seems the HW actually works in SGMII mode. The QDS boards are lower volume,
higher spec boards than the RDBs [3], they exercise most of the HW capabilities.

Regards,
Madalin

[1] https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/qoriq-layerscape-arm-processors/qoriq-layerscape-1012a-low-power-communication-processor:LS1012A
[2] https://www.aquantia.com/products/enterprise/aqr107/
[3] https://www.nxp.com/support/developer-resources/software-development-tools/qoriq-developer-resources/qoriq-ls1012a-reference-design-board:LS1012A-RDB