Index: sys/compat/linuxkpi/common/include/linux/device.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/device.h
+++ sys/compat/linuxkpi/common/include/linux/device.h
@@ -52,6 +52,7 @@
 
 struct device;
 struct fwnode_handle;
+struct device_node;
 
 struct class {
 	const char	*name;
@@ -119,6 +120,7 @@
 	unsigned int	irq_end;
 	const struct attribute_group **groups;
 	struct fwnode_handle *fwnode;
+	struct device_node *of_node;
 	struct cdev	*backlight_dev;
 	struct backlight_device	*bd;
 
Index: sys/compat/linuxkpi/common/include/linux/of.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/of.h
@@ -0,0 +1,85 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 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_OF_H
+#define	_LINUXKPI_LINUX_OF_H
+
+struct device_node {
+	void		*__dummy;
+};
+
+static inline const void *
+of_get_property(const struct device_node *node, const char *name,
+    int *len)
+{
+
+	return (NULL);
+}
+
+static inline int
+of_property_read_string(const struct device_node *node, const char *prop,
+    const char **buf)
+{
+
+	return (-EINVAL);
+}
+
+static inline int
+of_property_read_string_index(const struct device_node *node, const char *prop,
+    int idx, const char **buf)
+{
+
+	return (-EINVAL);
+}
+
+static inline int
+of_property_read_u8_array(const struct device_node *node, const char *prop,
+    uint8_t *buf, size_t buflen)
+{
+
+	return (-EINVAL);
+}
+
+static inline int
+of_property_read_u8(const struct device_node *node, const char *prop,
+    uint8_t *buf)
+{
+
+	return (of_property_read_u8_array(node, prop, buf, sizeof(*buf)));
+}
+
+static inline int
+of_property_read_u32(const struct device_node *node, const char *prop,
+    uint32_t *buf)
+{
+
+	return (-EINVAL);
+}
+
+#endif	/* _LINUXKPI_LINUX_OF_H */