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s390/time: Add PtP driver

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Add a small PtP driver which allows user space to get
the values of the physical and tod clock. This allows
programs like chrony to use STP as clock source and
steer the kernel clock. The physical clock can be used
as a debugging aid to get the clock without any additional
offsets like STP steering or LPAR offset.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://patch.msgid.link/20241023065601.449586-3-svens@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Sven Schnelle 2024-10-23 08:56:01 +02:00 • committed by Jakub Kicinski
commit 2d7de7a301
7 changed files with 160 additions and 0 deletions
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