linux-kernel - Re: [PATCH 2/2] net: dsa: mv88e6xxx: Support serdes ports on MV88E6097

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Message-ID: <2e1f1ca4-b5d5-ebc8-99bf-9ad74f461d26@alliedtelesis.co.nz>
Date:   Sun, 18 Oct 2020 21:15:52 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "olteanv@...il.com" <olteanv@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: dsa: mv88e6xxx: Support serdes ports on
 MV88E6097

On 19/10/20 9:25 am, Andrew Lunn wrote:
>> I assume you're talking about the PHY Control Register 0 bit 11. If so
>> that's for the internal PHYs on ports 0-7. Ports 8, 9 and 10 don't have
>> PHYs.
> Hi Chris
>
> I have a datasheet for the 6122/6121, from some corner of the web,
> Part 3 of 3, Gigabit PHYs and SERDES.
>
> http://www.image.micros.com.pl/_dane_techniczne_auto/ui88e6122b2lkj1i0.pdf
>
> Section 5 of this document talks
> about the SERDES registers. Register 0 is Control, register 1 is
> Status - Fiber, register 2 and 3 are the usual ID, 4 is auto-net
> advertisement etc.
>
> Where these registers appear in the address space is not clear from
> this document. It is normally in document part 2 of 3, which my
> searching of the web did not find.
>
> 	  Andrew

I have got the 88E6122 datasheet(s) and can see the SERDES registers 
you're talking about (I think they're in the same register space as the 
built-in PHYs). It looks like the 88E6097 is different in that there are 
no SERDES registers exposed (at least not in a documented way). Looking 
at the 88E6185 it's the same as the 88E6097.

So how do you want to move this series forward? I can test it on the 
88E6097 (and have restricted it to just that chip for now), I'm pretty 
sure it'll work on the 88E6185. I doubt it'll work on the 88E6122 but 
maybe it would with a different serdes_power function (or even the 
mv88e6352_serdes_power() as you suggested).