--- zzzz-none-000/linux-4.4.271/drivers/of/of_net.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/of/of_net.c	2023-04-19 10:22:29.000000000 +0000
@@ -10,6 +10,7 @@
 #include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/export.h>
+#include <linux/mtd/mtd.h>
 
 /**
  * of_get_phy_mode - Get phy mode for given device_node
@@ -80,3 +81,45 @@
 	return of_get_mac_addr(np, "address");
 }
 EXPORT_SYMBOL(of_get_mac_address);
+
+#ifdef CONFIG_MTD
+int of_get_mac_address_mtd(struct device_node *np, unsigned char *mac)
+{
+	struct device_node *mtd_np = NULL;
+	size_t retlen;
+	int size, ret;
+	struct mtd_info *mtd;
+	const char *part;
+	const __be32 *list;
+	phandle phandle;
+	u32 mac_inc = 0;
+
+	list = of_get_property(np, "mtd-mac-address", &size);
+	if (!list || (size != (2 * sizeof(*list))))
+		return -ENOENT;
+
+	phandle = be32_to_cpup(list++);
+	if (phandle)
+		mtd_np = of_find_node_by_phandle(phandle);
+
+	if (!mtd_np)
+		return -ENOENT;
+
+	part = of_get_property(mtd_np, "label", NULL);
+	if (!part)
+		part = mtd_np->name;
+
+	mtd = get_mtd_device_nm(part);
+	if (IS_ERR(mtd))
+		return PTR_ERR(mtd);
+
+	ret = mtd_read(mtd, be32_to_cpup(list), 6, &retlen, mac);
+	put_mtd_device(mtd);
+
+	if (!of_property_read_u32(np, "mtd-mac-address-increment", &mac_inc))
+		mac[5] += mac_inc;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(of_get_mac_address_mtd);
+#endif