netdev - [PATCH net-next 09/10] net: dsa: bcm_sf2: stop assigning an OF node to the ds->user_mii

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Message-Id: <20240104140037.374166-10-vladimir.oltean@nxp.com>
Date: Thu,  4 Jan 2024 16:00:36 +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 09/10] net: dsa: bcm_sf2: stop assigning an OF node to the ds->user_mii_bus

The bcm_sf2 driver does something strange. Instead of calling
of_mdiobus_register() with an OF node argument, it manually assigns the
bus->dev->of_node and then calls the non-OF mdiobus_register(). This
circumvents some code from __of_mdiobus_register() from running, which
sets the auto-scan mask, parses some device tree properties, etc.

I'm going to go out on a limb and say that the OF node isn't, in fact,
needed at all, and can be removed. The MDIO diversion as initially
implemented in commit 461cd1b03e32 ("net: dsa: bcm_sf2: Register our
slave MDIO bus") looked quite different than it is now, after commit
771089c2a485 ("net: dsa: bcm_sf2: Ensure that MDIO diversion is used").
Initially, it made sense, as bcm_sf2 was registering another set of
driver ops for the "brcm,unimac-mdio" OF node. But now, it deletes all
phandles, which makes "phy-handle"s unable to find PHYs, which means
that it always goes through the OF-unaware dsa_user_phy_connect().

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/bcm_sf2.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index cadee5505c29..19b325fa5a27 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -635,7 +635,6 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds)
 	priv->user_mii_bus->write = bcm_sf2_sw_mdio_write;
 	snprintf(priv->user_mii_bus->id, MII_BUS_ID_SIZE, "sf2-%d",
 		 index++);
-	priv->user_mii_bus->dev.of_node = dn;

 	/* Include the pseudo-PHY address to divert reads towards our
 	 * workaround. This is only required for 7445D0, since 7445E0
-- 
2.34.1