netdev - Re: [PATCH net-next 4/9] mlxsw: reg: Add Management UTC Register

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Message-ID: <78632a57-3dc7-f290-329b-b0ead767c750@mellanox.com>
Date:   Wed, 5 Jun 2019 18:55:18 +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 4/9] mlxsw: reg: Add Management UTC Register

On 05/06/2019 20:23, Richard Cochran wrote:
> On Wed, Jun 05, 2019 at 11:30:06AM +0000, Shalom Toledo wrote:
>> On 04/06/2019 17:17, Richard Cochran wrote:
>>> On Mon, Jun 03, 2019 at 03:12:39PM +0300, Ido Schimmel wrote:
>>>> From: Shalom Toledo <shalomt@...lanox.com>
>>>>
>>>> The MTUTC register configures the HW UTC counter.
>>>
>>> Why is this called the "UTC" counter?
>>>
>>> The PTP time scale is TAI.  Is this counter intended to reflect the
>>> Linux CLOCK_REALTIME system time?
>>
>> Exactly. The hardware doesn't have the ability to convert the FRC to UTC, so
>> we, as a driver, need to do it and align the hardware with this value.
> 
> What does "FRC" mean?

Free Running Counter

> 
> Thanks,
> Richard
>