From: Tobias Schramm <tobias@t-sys.eu>
Subject: mvpp2: support fetching mac address from nvmem

The mvpp2 driver did not query nvmem for hardware mac addresses. This
patch adds querying of mac addresses stored in nvmem cells as a further
fallback option before assigning a random address.
Purposely added separately to fwnode_get_mac_address() above to maintain
existing behaviour with builtin adapter mac address still taking
precedence.

Signed-off-by: Tobias Schramm <tobias@t-sys.eu>
---
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -6156,6 +6156,12 @@ static int mvpp2_port_copy_mac_addr(stru
 		return 0;
 	}
 
+	if (!of_get_mac_address(to_of_node(fwnode), hw_mac_addr)) {
+		*mac_from = "nvmem cell";
+		eth_hw_addr_set(dev, hw_mac_addr);
+		return 0;
+	}
+
 	*mac_from = "random";
 	eth_hw_addr_random(dev);