netdev - [PATCH V2 2/2 net-next] ethernet: Extend device_get_mac

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Message-Id: <20250912140332.35395-3-wahrenst@gmx.net>
Date: Fri, 12 Sep 2025 16:03:32 +0200
From: Stefan Wahren <wahrenst@....net>
To: Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	Stefan Wahren <wahrenst@....net>
Subject: [PATCH V2 2/2 net-next] ethernet: Extend device_get_mac_address() to use NVMEM

A lot of modern SoC have the ability to store MAC addresses in their
NVMEM. So extend the generic function device_get_mac_address() to
obtain the MAC address from an nvmem cell named 'mac-address' in
case there is no firmware node which contains the MAC address directly.

Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 net/ethernet/eth.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 4e3651101b86..43e211e611b1 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -613,7 +613,10 @@ EXPORT_SYMBOL(fwnode_get_mac_address);
  */
 int device_get_mac_address(struct device *dev, char *addr)
 {
-	return fwnode_get_mac_address(dev_fwnode(dev), addr);
+	if (!fwnode_get_mac_address(dev_fwnode(dev), addr))
+		return 0;
+
+	return nvmem_get_mac_address(dev, addr);
 }
 EXPORT_SYMBOL(device_get_mac_address);
 
-- 
2.34.1