netdev - Re: [RFC] Support for SGMII 2500

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Date:   Tue, 28 Nov 2017 09:51:01 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Madalin-cristian Bucur <madalin.bucur@....com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Bhaskar Upadhaya <bhaskar.upadhaya@....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>,
        linux@...linux.org.uk
Subject: Re: [RFC] Support for SGMII 2500

On 11/28/2017 07:37 AM, Madalin-cristian Bucur wrote:
>> -----Original Message-----
>> From: Andrew Lunn [mailto:andrew@...n.ch]
>> Sent: Tuesday, November 28, 2017 4:13 PM
>> To: Madalin-cristian Bucur <madalin.bucur@....com>
>> Subject: Re: [RFC] Support for SGMII 2500
>>
>>> 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.
>>
>> The webpage for the AQR107 lists 2500Base-X, so i assume the issue is
>> with the MAC? Ideally you want to use 2500Base-X, since this is wider
>> known.
>>
>> Anyway, you seem to have a legitimate need for it.
>>
>> However, i would prefer a different name. The convention is to put the
>> number first. So PHY_INTERFACE_MODE_2500SGMII.
>>
>>        Andrew
> 
> OK,
> 
> I just wanted to make sure 2.5G SGMII is to be added separately from the
> "normal" SGMII, as it was done in u-boot. Thanks also for the naming hint.

Sorry for chiming in that late, but what is 2.5G SGMII exactly? Either
you can use SGMII auto-negotiation, and in which case, why is not 2.5G
selected, or you can't and you might want to use a fixed-link property then.
-- 
Florian