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Some PTP hardware clock (PHC) devices may return -EOPNOTSUPP for operations like settime, adjtime, or adjfreq. This commonly occurs with timestamp-only PHC implementations that don't support full clock control. For background, syzbot previously exposed a crash risk when PTP clock drivers lacked required callbacks[1]. Subsequent work[2] made callback presence a registration requirement. As a result, some drivers (like iwlwifi MVM/MLD[3]) now provide stub callbacks that return -EOPNOTSUPP for unsupported operations. When phc_ctl encounters such devices, the "Operation not supported" error should be treated as a skip (device limitation) rather than a test failure. This patch: - Adds [SKIP] output handling in log_test() - Detects "Operation not supported" from phc_ctl and returns ksft_skip - Returns ksft_skip if all tests are skipped, preventing false-positive results when testing timestamp-only PHC implementations Link: https://lore.kernel.org/netdev/20251028043216.1971292-1-junjie.cao@intel.com/ [1] Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dfb073d32cac [2] Link: https://lore.kernel.org/netdev/20251204123204.9316-1-ziyao@disroot.org/ [3] Signed-off-by: Junjie Cao <junjie.cao@intel.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20260126061532.12532-2-junjie.cao@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>