[U-Boot] [RFC] Support for SGMII 2500

[Florian Fainelli]

On 11/28/2017 07:37 AM, Madalin-cristian Bucur wrote:
>> -----Original Message-----
>> From: Andrew Lunn [mailto:andrew at lunn.ch]
>> Sent: Tuesday, November 28, 2017 4:13 PM
>> To: Madalin-cristian Bucur <madalin.bucur at nxp.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