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Diffstat (limited to 'include/uapi/linux/ptp_clock.h')
-rw-r--r--include/uapi/linux/ptp_clock.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h
index 18eefa6d93d6..2c3346e91dbe 100644
--- a/include/uapi/linux/ptp_clock.h
+++ b/include/uapi/linux/ptp_clock.h
@@ -37,6 +37,9 @@
/*
* flag fields valid for the new PTP_EXTTS_REQUEST2 ioctl.
+ *
+ * Note: PTP_STRICT_FLAGS is always enabled by the kernel for
+ * PTP_EXTTS_REQUEST2 regardless of whether it is set by userspace.
*/
#define PTP_EXTTS_VALID_FLAGS (PTP_ENABLE_FEATURE | \
PTP_RISING_EDGE | \