netdev - [PATCH net-next v2] net: dsa: OF-ware slave_mii

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Message-Id: <20220218062147.7672-1-luizluca@gmail.com>
Date:   Fri, 18 Feb 2022 03:21:47 -0300
From:   Luiz Angelo Daros de Luca <luizluca@...il.com>
To:     netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, kuba@...nel.org,
        Luiz Angelo Daros de Luca <luizluca@...il.com>
Subject: [PATCH net-next v2] net: dsa: OF-ware slave_mii_bus

If found, register the DSA internally allocated slave_mii_bus with an OF
"mdio" child object. It can save some drivers from creating their
custom internal MDIO bus.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
---
 net/dsa/dsa2.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index e498c927c3d0..2206e2d2a7b3 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/rtnetlink.h>
 #include <linux/of.h>
+#include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <net/devlink.h>
 #include <net/sch_generic.h>
@@ -869,6 +870,7 @@ static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
 static int dsa_switch_setup(struct dsa_switch *ds)
 {
 	struct dsa_devlink_priv *dl_priv;
+	struct device_node *dn;
 	struct dsa_port *dp;
 	int err;
 
@@ -924,7 +926,10 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 
 		dsa_slave_mii_bus_init(ds);
 
-		err = mdiobus_register(ds->slave_mii_bus);
+		dn = of_get_child_by_name(ds->dev->of_node, "mdio");
+
+		err = of_mdiobus_register(ds->slave_mii_bus, dn);
+		of_node_put(dn);
 		if (err < 0)
 			goto free_slave_mii_bus;
 	}
-- 
2.35.1