using monotonic clok for timstamping

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Dear  all,

Our application relies on precise and monotonic timestamping of IMU samples (and other sensors). I am wondering what reasons / use cases led to the choice of realtime clock to implement iio_get_time_ns (not to mention time gaps that may be seen after wake up from sleep states).

As a dirty hack, I simply rewrote iio_get_time_ns on our platform. But I suspect it would be usefull as a long term solution, to give userland the ability to choose a particular posix clock (realtime, monotonic, etc...) on a per device and / or driver basis through a sysfs attribute for example.

I'd be glad to hear your suggestions. Best regards,
Grégor.
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