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Message-ID: <87a8al64mp.fsf@free-electrons.com>
Date: Fri, 20 Jan 2017 18:08:30 +0100
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
Florian Fainelli <f.fainelli@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Jason Cooper <jason@...edaemon.net>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
linux-arm-kernel@...ts.infradead.org,
Nadav Haklai <nadavh@...vell.com>,
Wilson Ding <dingwei@...vell.com>,
Kostya Porotchkin <kostap@...vell.com>,
Joe Zhou <shjzhou@...vell.com>,
Jon Pannell <jpannell@...vell.com>
Subject: Re: [PATCH v5 0/2] Add support for the ethernet switch on the ESPRESSObin
Hi Andrew,
On jeu., janv. 19 2017, Andrew Lunn <andrew@...n.ch> wrote:
>> While comparing the datasheet and the ops functions used, some
>> question came to me. They should not prevent applying this series,
>> but their answer would help me to have a better understanding of the
>> dsa subsystem.
>>
>> - Are the temperature related operation still useful with dsa2 ?
>
> No. I'm in the process of moving the code into the Marvell PHY driver,
> since the sensor is in the embedded PHYs.
>
> What ID does the embedded PHY use? The 6390 has a blank ID, where as
> older device have a real ID.
Actually I didn't find anything related to the temperature measurement
in the datasheet I have. For the 6390 there is a dedicated datsheet for
the PHY part for the 6352 it is part of the same datasheet.
After a second look I think I don't have anything related to the PHY
part in the datasheets.
What I wanted to do was to test 6390 and 6352 temperature related
functions and to see if one of them worked. That's how I realized it was
not possible to do it with dsa2.
>
>> - Why the setup is done differently between the 6390 and the 6352
>> families when the have exactly the same register?
>
> EDSA on 6390 works differently to 6352, meaning it breaks. So we need
> to run the 6390 with DSA tagging, not EDSA. Maybe this is the source
> of the differences?
>
> It should also be noted that the 6390 support is not yet complete. I
> have a few more patches in my tree to post.
>
>> - On the Port Controller 2, the bit PORT_CONTROL_2_MAP_DA is set for
>> 6352 and not for 6390 whereas the same bit exists in 6360 and the
>> description for this bit is the same for both datasheet.
>
> Humm, it does look like it is missing mv88e6xxx_6390_family(chip).
>
>>
>> - Register PORT_ATU_CONTROL and PORT_PRI_OVERRIDE are reset on 6352
>> and not on 6390. While here again the registers description are
>> the same.
>
> And the same here. I've mostly been working on where the 6390 is
> different. Where it is the same i've mostly ignored it so far :-)
>
> There is also an ongoing effort to remove all these big if statements
> with a list of families.
Thanks for this answers I understand it a little better now.
Gregory
>
> Andrew
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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