netdev - [PATCH net-next 03/10] net: dsa: lantiq_gswip: ignore MDIO buses disabled in OF

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Message-Id: <20240104140037.374166-4-vladimir.oltean@nxp.com>
Date: Thu,  4 Jan 2024 16:00:30 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Luiz Angelo Daros de Luca <luizluca@...il.com>,
	Alvin Šipraga <alsi@...g-olufsen.dk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Christian Marangi <ansuelsmth@...il.com>,
	Arınç ÜNAL <arinc.unal@...nc9.com>
Subject: [PATCH net-next 03/10] net: dsa: lantiq_gswip: ignore MDIO buses disabled in OF

If the "lantiq,xrx200-mdio" child has status = "disabled", the MDIO bus
creation should be avoided. Use of_device_is_available() to check for
that, and take advantage of 2 facts:

- of_device_is_available(NULL) returns false
- of_node_put(NULL) is a no-op

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/lantiq_gswip.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index a514e6c78c38..de48b194048f 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -510,11 +510,11 @@ static int gswip_mdio(struct gswip_priv *priv)
 	struct device_node *mdio_np, *switch_np = priv->dev->of_node;
 	struct device *dev = priv->dev;
 	struct mii_bus *bus;
-	int err;
+	int err = 0;
 
 	mdio_np = of_get_compatible_child(switch_np, "lantiq,xrx200-mdio");
-	if (!mdio_np)
-		return 0;
+	if (!of_device_is_available(mdio_np))
+		goto out_put_node;
 
 	bus = devm_mdiobus_alloc(dev);
 	if (!bus) {
-- 
2.34.1