Subject: [patch 23/24] timekeeping: Add support for AUX clock cross timestamping

From: Thomas Gleixner <[email-masked]>
Date: Tue, 26 May 2026 19:15:22 +0200

Now that all prerequisites are in place add the final support for AUX
clocks in get_device_system_crosststamp(), which enables the PTP layer to
support hardware cross timestamps with a new IOTCL.

Signed-off-by: Thomas Gleixner <[email-masked]>
---
 kernel/time/timekeeping.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1518,6 +1518,12 @@ int get_device_system_crosststamp(int (*
 		tkd = &tk_core;
 		offs = &tk_core.timekeeper.offs_real;
 		break;
+	case CLOCK_AUX ... CLOCK_AUX_LAST:
+		tkd = aux_get_tk_data(xtstamp->clock_id);
+		if (!tkd)
+			return false;
+		offs = &tkd->timekeeper.offs_aux;
+		break;
 	default:
 		WARN_ON_ONCE(1);
 		return false;