linux-kernel - Re: [PATCH net v2] net: ti: icssg-prueth: Fix 1 PPS sync

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Message-ID: <c735f62e-c9fc-4698-ae9f-305cd5519dbd@ti.com>
Date: Thu, 24 Oct 2024 19:03:00 +0530
From: "Anwar, Md Danish" <a0501179@...com>
To: Meghana Malladi <m-malladi@...com>, <vigneshr@...com>, <horms@...nel.org>,
        <jan.kiszka@...mens.com>, <diogo.ivo@...mens.com>, <pabeni@...hat.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <davem@...emloft.net>,
        <andrew+netdev@...n.ch>
CC: <linux-kernel@...r.kernel.org>, <vadim.fedorenko@...ux.dev>,
        <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>, Roger Quadros <rogerq@...nel.org>, <danishanwar@...com>
Subject: Re: [PATCH net v2] net: ti: icssg-prueth: Fix 1 PPS sync

Hi Meghana,

On 10/24/2024 5:01 PM, Meghana Malladi wrote:
> The first PPS latch time needs to be calculated by the driver
> (in rounded off seconds) and configured as the start time
> offset for the cycle. After synchronizing two PTP clocks
> running as master/slave, missing this would cause master
> and slave to start immediately with some milliseconds
> drift which causes the PPS signal to never synchronize with
> the PTP master.
> 
> Fixes: 186734c15886 ("net: ti: icssg-prueth: add packet timestamping and ptp support")
> Signed-off-by: Meghana Malladi <m-malladi@...com>

Reviewed-by: MD Danish Anwar <danishanwar@...com>

-- 
Thanks and Regards,
Md Danish Anwar