linux-kernel - Re: [Patch net-next v7 04/13] net: dsa: microchip: ptp: manipulating absolute time using ptp hw clock

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Message-ID: <20230104140852.udslp3zjwfgbpq3i@skbuf>
Date:   Wed, 4 Jan 2023 16:08:52 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux@...linux.org.uk,
        Tristram.Ha@...rochip.com, richardcochran@...il.com,
        ceggers@...i.de
Subject: Re: [Patch net-next v7 04/13] net: dsa: microchip: ptp: manipulating
 absolute time using ptp hw clock

On Wed, Jan 04, 2023 at 02:13:07PM +0530, Arun Ramadoss wrote:
> From: Christian Eggers <ceggers@...i.de>
> 
> This patch is used for reconstructing the absolute time from the 32bit
> hardware time stamping value. The do_aux ioctl is used for reading the
> ptp hardware clock and store it to global variable.
> The timestamped value in tail tag during rx and register during tx are
> 32 bit value (2 bit seconds and 30 bit nanoseconds). The time taken to
> read entire ptp clock will be time consuming. In order to speed up, the
> software clock is maintained. This clock time will be added to 32 bit
> timestamp to get the absolute time stamp.
> 
> Signed-off-by: Christian Eggers <ceggers@...i.de>
> Co-developed-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>