netdev - [PATCH net-next v3 1/2] of: mdio: warn if deprecated fixed-link binding is used

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Message-ID: <faf94844-96eb-400f-8a3a-b2a0e93b27d7@gmail.com>
Date: Fri, 12 Sep 2025 21:06:12 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Andrew Lunn <andrew@...n.ch>, Andrew Lunn <andrew+netdev@...n.ch>,
 Russell King - ARM Linux <linux@...linux.org.uk>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, David Miller <davem@...emloft.net>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v3 1/2] of: mdio: warn if deprecated fixed-link
 binding is used

The array-style fixed-link binding has been marked deprecated for more
than 10 yrs, but still there's a number of users. Print a warning when
usage of the deprecated binding is detected.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
v2:
- use %pOF printk specifier
v3:
- add missing newline
---
 drivers/net/mdio/of_mdio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index d8ca63ed8..24e03f7a6 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -447,6 +447,8 @@ int of_phy_register_fixed_link(struct device_node *np)
 	/* Old binding */
 	if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,
 				       ARRAY_SIZE(fixed_link_prop)) == 0) {
+		pr_warn_once("%pOF uses deprecated array-style fixed-link binding!\n",
+			     np);
 		status.link = 1;
 		status.duplex = fixed_link_prop[1];
 		status.speed  = fixed_link_prop[2];
-- 
2.51.0