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

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Message-ID: <20190605172354.gixuid7t72yoxjks@localhost>
Date:   Wed, 5 Jun 2019 10:23:54 -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 4/9] mlxsw: reg: Add Management UTC Register

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?

Thanks,
Richard