netdev - [PATCH net-next v2 7/7] Revert "net: dsa: OF-ware slave_mii

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Date: Wed, 20 Dec 2023 01:24:30 -0300
From: Luiz Angelo Daros de Luca <luizluca@...il.com>
To: netdev@...r.kernel.org
Cc: linus.walleij@...aro.org,
	alsi@...g-olufsen.dk,
	andrew@...n.ch,
	f.fainelli@...il.com,
	olteanv@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	arinc.unal@...nc9.com,
	Luiz Angelo Daros de Luca <luizluca@...il.com>
Subject: [PATCH net-next v2 7/7] Revert "net: dsa: OF-ware slave_mii_bus"

This reverts commit fe7324b932222574a0721b80e72c6c5fe57960d1.

The use of user_mii_bus is inappropriate when the hardware is described
with a device-tree [1].

Since all drivers currently implementing ds_switch_ops.phy_{read,write}
were not updated to utilize the MDIO information from OF with the
generic "dsa user mii", they might not be affected by this change.

[1] https://lkml.kernel.org/netdev/20231213120656.x46fyad6ls7sqyzv@skbuf/T/#u

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

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index ac7be864e80d..cea364c81b70 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -15,7 +15,6 @@
 #include <linux/slab.h>
 #include <linux/rtnetlink.h>
 #include <linux/of.h>
-#include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <net/dsa_stubs.h>
 #include <net/sch_generic.h>
@@ -626,7 +625,6 @@ static void dsa_switch_teardown_tag_protocol(struct dsa_switch *ds)
 
 static int dsa_switch_setup(struct dsa_switch *ds)
 {
-	struct device_node *dn;
 	int err;
 
 	if (ds->setup)
@@ -666,10 +664,7 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 
 		dsa_user_mii_bus_init(ds);
 
-		dn = of_get_child_by_name(ds->dev->of_node, "mdio");
-
-		err = of_mdiobus_register(ds->user_mii_bus, dn);
-		of_node_put(dn);
+		err = mdiobus_register(ds->user_mii_bus, dn);
 		if (err < 0)
 			goto free_user_mii_bus;
 	}
-- 
2.43.0