linux-kernel - Re: [RFC PATCH net-next 7/9] net: dsa: microchip: ksz9477: add hardware time stamping support

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Message-ID: <20201110014234.b3qdmc2e74poawpz@skbuf>
Date:   Tue, 10 Nov 2020 03:42:34 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Eggers <ceggers@...i.de>
Cc:     Richard Cochran <richardcochran@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Helmut Grohne <helmut.grohne@...enta.de>,
        Paul Barker <pbarker@...sulko.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        George McCollister <george.mccollister@...il.com>,
        Marek Vasut <marex@...x.de>,
        Tristram Ha <Tristram.Ha@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 7/9] net: dsa: microchip: ksz9477: add
 hardware time stamping support

Sorry for getting back late to you. It did not compute when I read your
email the first time around, then I let it sit for a while.

On Thu, Nov 05, 2020 at 09:18:04PM +0100, Christian Eggers wrote:
> unfortunately I made a mistake when testing. Actually the timestamp *must* be
> moved from the correction field (negative) to the egress tail tag.

That doesn't sound very good at all.

I have a simple question. Can your driver, when operating as a PTP
master clock, distribute a time in 2020 into your network? (you can
check with "phc_ctl /dev/ptp0 get")