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

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Date:   Thu, 6 Jun 2019 08:57:59 +0000
From:   Shalom Toledo <shalomt@...lanox.com>
To:     Richard Cochran <richardcochran@...il.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 06/06/2019 11:50, Shalom Toledo wrote:
> On 06/06/2019 5:43, Richard Cochran wrote:
>> 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.
> 
> I mean that these are two different peaces of HW with different control
> interfaces.

pieces*

> 
>>
>> Perhaps the free running counter and the HW clock share the same clock
>> source?
> 
> Yes, of course.
> 
>>
>> Thanks,
>> Richard
>>
>