linux-kernel - [PATCH 1/2] mt7530: register OF node for internal MDIO bus

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Date:   Sun, 30 Apr 2023 13:28:32 +0200
From:   David Bauer <mail@...id-bauer.net>
To:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH 1/2] mt7530: register OF node for internal MDIO bus

The MT753x switches provide a switch-internal MDIO bus for the embedded
PHYs.

Register a OF sub-node on the switch OF-node for this internal MDIO bus.
This allows to configure the embedded PHYs using device-tree.

Signed-off-by: David Bauer <mail@...id-bauer.net>
---
 drivers/net/dsa/mt7530.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index c680873819b0..7e8ea5b75c3e 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2119,10 +2119,13 @@ mt7530_setup_mdio(struct mt7530_priv *priv)
 {
 	struct dsa_switch *ds = priv->ds;
 	struct device *dev = priv->dev;
+	struct device_node *np, *mnp;
 	struct mii_bus *bus;
 	static int idx;
 	int ret;
 
+	np = priv->dev->of_node;
+
 	bus = devm_mdiobus_alloc(dev);
 	if (!bus)
 		return -ENOMEM;
@@ -2141,7 +2144,9 @@ mt7530_setup_mdio(struct mt7530_priv *priv)
 	if (priv->irq)
 		mt7530_setup_mdio_irq(priv);
 
-	ret = devm_mdiobus_register(dev, bus);
+	mnp = of_get_child_by_name(np, "mdio");
+	ret = devm_of_mdiobus_register(dev, bus, mnp);
+	of_node_put(mnp);
 	if (ret) {
 		dev_err(dev, "failed to register MDIO bus: %d\n", ret);
 		if (priv->irq)
-- 
2.39.2