linux-kernel - [PATCHv2 net-next 1/2] net: thunder

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Message-ID: <20250904213228.8866-2-rosenp@gmail.com>
Date: Thu,  4 Sep 2025 14:32:27 -0700
From: Rosen Penev <rosenp@...il.com>
To: netdev@...r.kernel.org
Cc: Sunil Goutham <sgoutham@...vell.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>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/CAVIUM THUNDER NETWORK DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCHv2 net-next 1/2] net: thunder_bgx: check for MAC probe defer

of_get_mac_address supports NVMEM, which can load after the driver.
Check for it and defer in such a case.

Signed-off-by: Rosen Penev <rosenp@...il.com>
---
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index 9efb60842ad1..a68dccb7c2da 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1471,6 +1471,7 @@ static int bgx_init_of_phy(struct bgx *bgx)
 	struct fwnode_handle *fwn;
 	struct device_node *node = NULL;
 	u8 lmac = 0;
+	int err;
 
 	device_for_each_child_node(&bgx->pdev->dev, fwn) {
 		struct phy_device *pd;
@@ -1483,7 +1484,9 @@ static int bgx_init_of_phy(struct bgx *bgx)
 		if (!node)
 			break;
 
-		of_get_mac_address(node, bgx->lmac[lmac].mac);
+		err = of_get_mac_address(node, bgx->lmac[lmac].mac);
+		if (err == -EPROBE_DEFER)
+			goto defer;
 
 		SET_NETDEV_DEV(bgx->lmac[lmac].netdev, &bgx->pdev->dev);
 		bgx->lmac[lmac].lmacid = lmac;
-- 
2.51.0