[PATCH v4 0/3] Fix buffer timestamp documentation

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Hi,

This patchset fixes the documentation related to V4L2 buffer timestamps.
Timestamps in the vast majority of drivers is taken af the end of the frame
rather than at the start of it.

since v3:

Besides the first patch, as suggested, I've added two more to add a new
v4l2_buffer.flags flag (V4L2_BUF_FLAG_TIMESTAMP_SOF) to tell the timestamp
is taken at the start of the frame. What is also changed in the
documentation is that the timestamps are end-of-frame by default and
start-of-frame when the flag is set.

-- 
Kind regards,
Sakari

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