/**
* struct ptp_system_timestamp - system time corresponding to a PHC timestamp
+ * @pre_ts: system timestamp before capturing PHC
+ * @post_ts: system timestamp after capturing PHC
*/
struct ptp_system_timestamp {
struct timespec64 pre_ts;
* should most likely call ptp_find_pin() directly from their
* ptp_clock_info::enable() method.
*
+* @ptp: The clock obtained from ptp_clock_register().
+* @func: One of the ptp_pin_function enumerated values.
+* @chan: The particular functional channel to find.
+* Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
+* or -1 if the auxiliary function cannot be found.
*/
int ptp_find_pin_unlocked(struct ptp_clock *ptp,