netdev - [PATCH net-next v2 3/7] net: phy: add swnode support to mdiobus

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Message-ID: <trinity-9144938c-87b3-4224-825e-464d6503be64-1726430331937@3c-app-gmx-bap07>
Date: Sun, 15 Sep 2024 21:58:51 +0200
From: Hans-Frieder Vogt <hfdevel@....net>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, FUJITA Tomonori
 <fujita.tomonori@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 3/7] net: phy: add swnode support to
 mdiobus_scan

Add swnode support to mdiobus_scan, to allow addition of a swnode/fwnode to
a phy_device. The MDIO bus (mii_bus) needs to contain nodes for the PHY
devices, named "ethernet-phy@i", with i being the MDIO address
(0 .. PHY_MAX_ADDR - 1).

The fwnode is only attached to the phy_device if there isn't already an
fwnode attached.

fwnode_get_named_child_node will increase the usage counter of the fwnode.
However, no new code is needed to decrease the counter again, since this is
already implemented in the phy_device_release function.

Signed-off-by: Hans-Frieder Vogt <hfdevel@....net>
---
 drivers/net/phy/mdio_bus.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 7e2f10182c0c..ede596c1a69d 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -551,6 +551,8 @@ static int mdiobus_create_device(struct mii_bus *bus,
 static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)
 {
 	struct phy_device *phydev = ERR_PTR(-ENODEV);
+	struct fwnode_handle *fwnode;
+	char node_name[16];
 	int err;

 	phydev = get_phy_device(bus, addr, c45);
@@ -562,6 +564,18 @@ static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)
 	 */
 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);

+	/* Search for a swnode for the phy in the swnode hierarchy of the bus.
+	 * If there is no swnode for the phy provided, just ignore it.
+	 */
+	if (dev_fwnode(&bus->dev) && !dev_fwnode(&phydev->mdio.dev)) {
+		snprintf(node_name, sizeof(node_name), "ethernet-phy@%d",
+			 addr);
+		fwnode = fwnode_get_named_child_node(dev_fwnode(&bus->dev),
+						     node_name);
+		if (fwnode)
+			device_set_node(&phydev->mdio.dev, fwnode);
+	}
+
 	err = phy_device_register(phydev);
 	if (err) {
 		phy_device_free(phydev);
--
2.45.2