netdev - Re: [PATCH net-next v2] net: dsa: mv88e6xxx: Enable PTP receive for mv88e6390

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Date:   Thu, 12 Jan 2023 16:21:11 +0100
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: dsa: mv88e6xxx: Enable PTP receive for
 mv88e6390

On Thu Jan 12 2023, Andrew Lunn wrote:
> On Thu, Jan 12, 2023 at 10:12:24AM +0100, Kurt Kanzenbach wrote:
>> The switch receives management traffic such as STP and LLDP. However, PTP
>> messages are not received, only transmitted.
>> 
>> Ideally, the switch would trap all PTP messages to the management CPU. This
>> particular switch has a PTP block which identifies PTP messages and traps them
>> to a dedicated port. There is a register to program this destination. This is
>> not used at the moment.
>> 
>> Therefore, program it to the same port as the MGMT traffic is trapped to. This
>> allows to receive PTP messages as soon as timestamping is enabled.
>> 
>> In addition, the datasheet mentions that this register is not valid e.g., for
>> 6190 variants. So, add a new PTP operation which is only added for the both 6390
>> devices.
>
> I assume this also works for the 6290? Please could you also update
> its _ops structure?

According to the datasheet, yes. I'll add this one, too.

Thanks,
Kurt

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