netdev - Re: [PATCH net-next 7/9] mlxsw: spectrum_ptp: Add implementation for physical hardware clock operations

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Date:   Wed, 5 Jun 2019 19:43:20 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Shalom Toledo <shalomt@...lanox.com>
Cc:     Ido Schimmel <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Petr Machata <petrm@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net-next 7/9] mlxsw: spectrum_ptp: Add implementation for
 physical hardware clock operations

On Wed, Jun 05, 2019 at 07:28:38PM +0000, Shalom Toledo wrote:
> So, there is an HW machine which responsible for adding UTC timestamp on
> R-SPAN mirror packets and there is no connection to the HW free running
> counter.

If there is no connection, then the frequency adjustments to the HW
clock will not work as expected.

Perhaps the free running counter and the HW clock share the same clock
source?

Thanks,
Richard