netdev - Re: [PATCH v1 3/8] net: dsa: hellcreek: Add PTP clock support

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Date:   Sat, 11 Jul 2020 13:30:13 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kamil Alkhouri <kamil.alkhouri@...offenburg.de>,
        ilias.apalodimas@...aro.org, Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH v1 3/8] net: dsa: hellcreek: Add PTP clock support

On Fri, Jul 10, 2020 at 01:36:06PM +0200, Kurt Kanzenbach wrote:
> From: Kamil Alkhouri <kamil.alkhouri@...offenburg.de>
> 
> The switch has internal PTP hardware clocks. Add support for it. There are three
> clocks:
> 
>  * Synchronized
>  * Syntonized
>  * Free running
> 
> Currently the synchronized clock is exported to user space which is a good
> default for the beginning. The free running clock might be exported later
> e.g. for implementing 802.1AS-2011/2020 Time Aware Bridges (TAB). The switch
> also supports cross time stamping for that purpose.
> 
> The implementation adds support setting/getting the time as well as offset and
> frequency adjustments. However, the clock only holds a partial timeofday
> timestamp. This is why we track the seconds completely in software (see overflow
> work and last_ts).
> 
> Furthermore, add the PTP multicast addresses into the FDB to forward that
> packages only to the CPU port where they are processed by a PTP program.
> 
> Signed-off-by: Kamil Alkhouri <kamil.alkhouri@...offenburg.de>
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>

Acked-by: Richard Cochran <richardcochran@...il.com>