+#define AM33XX_CTRL_MAC_LO_REG(id) (0x630 + 0x8 * id)
+#define AM33XX_CTRL_MAC_HI_REG(id) (0x630 + 0x8 * id + 0x4)
+
+static int cpsw_am33xx_cm_get_macid(struct device *dev, int slave,
+ u8 *mac_addr)
+{
+ u32 macid_lo;
+ u32 macid_hi;
+ struct regmap *syscon;
+
+ syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
+ if (IS_ERR(syscon)) {
+ if (PTR_ERR(syscon) == -ENODEV)
+ return 0;
+ return PTR_ERR(syscon);
+ }
+
+ regmap_read(syscon, AM33XX_CTRL_MAC_LO_REG(slave), &macid_lo);
+ regmap_read(syscon, AM33XX_CTRL_MAC_HI_REG(slave), &macid_hi);
+
+ mac_addr[5] = (macid_lo >> 8) & 0xff;
+ mac_addr[4] = macid_lo & 0xff;
+ mac_addr[3] = (macid_hi >> 24) & 0xff;
+ mac_addr[2] = (macid_hi >> 16) & 0xff;
+ mac_addr[1] = (macid_hi >> 8) & 0xff;
+ mac_addr[0] = macid_hi & 0xff;
+
+ return 0;
+}
+