v4.19.13 snapshot.
diff --git a/include/linux/of_net.h b/include/linux/of_net.h
new file mode 100644
index 0000000..90d81ee
--- /dev/null
+++ b/include/linux/of_net.h
@@ -0,0 +1,40 @@
+/*
+ * OF helpers for network devices.
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_NET_H
+#define __LINUX_OF_NET_H
+
+#ifdef CONFIG_OF_NET
+#include <linux/of.h>
+
+struct net_device;
+extern int of_get_phy_mode(struct device_node *np);
+extern const void *of_get_mac_address(struct device_node *np);
+extern int of_get_nvmem_mac_address(struct device_node *np, void *addr);
+extern struct net_device *of_find_net_device_by_node(struct device_node *np);
+#else
+static inline int of_get_phy_mode(struct device_node *np)
+{
+ return -ENODEV;
+}
+
+static inline const void *of_get_mac_address(struct device_node *np)
+{
+ return NULL;
+}
+
+static inline int of_get_nvmem_mac_address(struct device_node *np, void *addr)
+{
+ return -ENODEV;
+}
+
+static inline struct net_device *of_find_net_device_by_node(struct device_node *np)
+{
+ return NULL;
+}
+#endif
+
+#endif /* __LINUX_OF_NET_H */