Merge branch 'for-5.17/letsketch' into for-linus

- new driver to support for LetSketch device (Hans de Goede)

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index f71ad317d6c8..53c15fc9d996 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -55,15 +55,21 @@ struct ice_perout_channel {
  * struct ice_tx_tstamp - Tracking for a single Tx timestamp
  * @skb: pointer to the SKB for this timestamp request
  * @start: jiffies when the timestamp was first requested
+ * @cached_tstamp: last read timestamp
  *
  * This structure tracks a single timestamp request. The SKB pointer is
  * provided when initiating a request. The start time is used to ensure that
  * we discard old requests that were not fulfilled within a 2 second time
  * window.
+ * Timestamp values in the PHY are read only and do not get cleared except at
+ * hardware reset or when a new timestamp value is captured. The cached_tstamp
+ * field is used to detect the case where a new timestamp has not yet been
+ * captured, ensuring that we avoid sending stale timestamp data to the stack.
  */
 struct ice_tx_tstamp {
 	struct sk_buff *skb;
 	unsigned long start;
+	u64 cached_tstamp;
 };
 
 /**