diff --git a/sys/compat/linuxkpi/common/include/linux/platform_device.h b/sys/compat/linuxkpi/common/include/linux/platform_device.h
index f07b5aac967b..f45cdce829c4 100644
--- a/sys/compat/linuxkpi/common/include/linux/platform_device.h
+++ b/sys/compat/linuxkpi/common/include/linux/platform_device.h
@@ -1,79 +1,89 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2020-2022 Bjoern A. Zeeb
  *
  * 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_PLATFORM_DEVICE_H
 #define	_LINUXKPI_LINUX_PLATFORM_DEVICE_H
 
 #include <linux/kernel.h>
 #include <linux/device.h>
 
 struct platform_device {
 	struct device			dev;
 };
 
 struct platform_driver {
 	int				(*remove)(struct platform_device *);
 	struct device_driver		driver;
 };
 
+#define	dev_is_platform(dev)	(false)
+#define	to_platform_device(dev)	(NULL)
 
 static __inline int
 platform_driver_register(struct platform_driver *pdrv)
 {
 
 	pr_debug("%s: TODO\n", __func__);
 	return (-ENXIO);
 }
 
 static __inline void *
 dev_get_platdata(struct device *dev)
 {
 
 	pr_debug("%s: TODO\n", __func__);
 	return (NULL);
 }
 
 static __inline int
 platform_driver_probe(struct platform_driver *pdrv,
     int(*pd_probe_f)(struct platform_device *))
 {
 
 	pr_debug("%s: TODO\n", __func__);
 	return (-ENODEV);
 }
 
 static __inline void
 platform_driver_unregister(struct platform_driver *pdrv)
 {
 
 	pr_debug("%s: TODO\n", __func__);
 	return;
 }
 
+static __inline void
+platform_device_unregister(struct platform_device *pdev)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return;
+}
+
 #endif	/* _LINUXKPI_LINUX_PLATFORM_DEVICE_H */