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SubjectRe: [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 <>
> 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 <>

Acked-by: Rodolfo Giometti <>

GNU/Linux Solutions e-mail:
Linux Device Driver
Embedded Systems phone: +39 349 2432127
UNIX programming skype: rodolfo.giometti

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