diff --git a/sys/compat/linuxkpi/common/include/linux/ptp_clock_kernel.h b/sys/compat/linuxkpi/common/include/linux/ptp_clock_kernel.h
new file mode 100644
index 000000000000..b7b0bac0607e
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/ptp_clock_kernel.h
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 2023 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_LINUXKPI_LINUX_PTP_CLOCK_KERNEL_H
+#define	_LINUXKPI_LINUX_PTP_CLOCK_KERNEL_H
+
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/kernel.h>	/* pr_debug */
+#include <linux/ktime.h>	/* system_device_crosststamp */
+
+/* This very likely belongs elsewhere. */
+struct system_device_crosststamp {
+	ktime_t	device;
+	ktime_t	sys_realtime;
+	ktime_t	sys_monotonic_raw;	/* name guessed based on comment */
+};
+
+struct ptp_clock_info {
+	char		name[32];
+	int		max_adj;
+	void		*owner;			/* THIS_MODULE */
+	int (*adjfine)(struct ptp_clock_info *, long);
+	int (*adjtime)(struct ptp_clock_info *, s64);
+	int (*getcrosststamp)(struct ptp_clock_info *, struct system_device_crosststamp *);
+	int (*gettime64)(struct ptp_clock_info *, struct timespec *);
+};
+
+static inline struct ptp_clock *
+ptp_clock_register(struct ptp_clock_info *ptpci, struct device *dev)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (NULL);
+}
+
+static inline void
+ptp_clock_unregister(struct ptp_clock *ptpc)
+{
+	pr_debug("%s: TODO\n", __func__);
+}
+
+static inline int
+ptp_clock_index(struct ptp_clock *ptpc)
+{
+	pr_debug("%s: TODO\n", __func__);
+	return (0);
+}
+
+#endif	/* _LINUXKPI_LINUX_PTP_CLOCK_KERNEL_H */