[RFC PATCH 2/5] PTP: add a callback for counting timestamp events

[Felipe Balbi <felipe.balbi@linux.intel.com>]

This will be used for frequency discipline adjustments.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
 include/linux/ptp_clock_kernel.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 28eb9c792522..1a4e3f916128 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -35,6 +35,16 @@ struct ptp_system_timestamp {
 	struct timespec64 post_ts;
 };
 
+/**
+ * struct ptp_event_count_tstamp - device time vs event count for frequency discipline
+ */
+struct ptp_event_count_tstamp {
+	unsigned int index;
+
+	struct ptp_clock_time device_time;
+	u64 event_count;
+};
+
 /**
  * struct ptp_clock_info - decribes a PTP hardware clock
  *
@@ -134,6 +144,8 @@ struct ptp_clock_info {
 			  struct ptp_system_timestamp *sts);
 	int (*getcrosststamp)(struct ptp_clock_info *ptp,
 			      struct system_device_crosststamp *cts);
+	int (*counttstamp)(struct ptp_clock_info *ptp,
+			   struct ptp_event_count_tstamp *count);
 	int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
 	int (*enable)(struct ptp_clock_info *ptp,
 		      struct ptp_clock_request *request, int on);
-- 
2.22.0