linux-kernel - Re: [PATCH 1/1] Calculate the monotonic clock from the timespec clock to generate PPS elapsed real-time event value and stores the result into /sys/class/pps/pps0/assert

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Message-ID: <a2dd9fa7-c6d2-d234-7652-53014672fe0a@enneenne.com>
Date:   Fri, 26 Nov 2021 11:49:25 +0100
From:   Rodolfo Giometti <giometti@...eenne.com>
To:     Alexander Komrakov <alexander.komrakov@...adcom.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Calculate the monotonic clock from the timespec clock
 to generate PPS elapsed real-time event value and stores the result into
 /sys/class/pps/pps0/assert_elapsed.

On 18/11/21 04:22, Alexander Komrakov wrote:
> From: alexkom <alexander.komrakov@...adcom.com>
> 
> Because we have requirements to make sure the delta between standard time, say the GPS Time, and elapsedRealtime < 1 millisecond, regular linux clock timestamp is not enough for our use case.
> The pin PPS will generate elapsedRealtime event at 1 sec boundary which is an exact value of the monotonic clock from the kernel PPS driver (/sys/class/pps/pps0/assert_elapsed).
> 
> Whenever AP receives this pulse, kernel's pps driver timestamp this elapsedRealtime event and let this time available via sysfs node (/sys/class/pps/pps0/assert_elapsed).
> 
> Signed-off-by: alexkom <alexander.komrakov@...adcom.com>

Acked-by: Rodolfo Giometti <giometti@...eenne.com>

-- 
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