testptp: Add option to open PHC in readonly mode

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PTP Hardware Clocks no longer require WRITE permission to perform
readonly operations, such as listing device capabilities or listening to
EXTTS events once they have been enabled by a process with WRITE
permissions.

Add '-r' option to testptp to open the PHC in readonly mode instead of
the default read-write mode. Skip enabling EXTTS if readonly mode is
requested.

Acked-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: Wojtek Wasko <wwasko@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Wojtek Wasko 2025-03-03 18:13:45 +02:00 • committed by David S. Miller

parent b4e53b15c0

commit 76868642e4

1 changed files with 23 additions and 14 deletions

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tools/testing/selftests/ptp/testptp.c

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