linux-kernel - [RFC PATCH net-next v2 10/11] net: mdio: of: use fwnode_mdiobus_register() in of_mdiobus

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Date:   Thu, 31 Mar 2022 11:25:32 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Clément Léger <clement.leger@...tlin.com>
Subject: [RFC PATCH net-next v2 10/11] net: mdio: of: use fwnode_mdiobus_register() in of_mdiobus_register()

Now that fwnode_mdiobus_register() also handle phy registration, modify
of_mdiobus_register() to use this one but keep ilegacy scanning of
nodes that don't have a "reg" property. The behavior is a bit different
since the scanning loop will always be executed even if all nodes have
a "reg" property. However, since the "reg" property is checked in that
loop, the final outcome will be the same (ie scan only the node that
don't have a "reg" property). Since of_mdiobus_register_device() is not
used anymore, remove it.

Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 drivers/net/mdio/of_mdio.c | 77 +-------------------------------------
 1 file changed, 1 insertion(+), 76 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 9c3cd8d3d1f6..4a7ad6704feb 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -47,36 +47,6 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio,
 	return fwnode_mdiobus_register_phy(mdio, of_fwnode_handle(child), addr);
 }
 
-static int of_mdiobus_register_device(struct mii_bus *mdio,
-				      struct device_node *child, u32 addr)
-{
-	struct fwnode_handle *fwnode = of_fwnode_handle(child);
-	struct mdio_device *mdiodev;
-	int rc;
-
-	mdiodev = mdio_device_create(mdio, addr);
-	if (IS_ERR(mdiodev))
-		return PTR_ERR(mdiodev);
-
-	/* Associate the OF node with the device structure so it
-	 * can be looked up later.
-	 */
-	fwnode_handle_get(fwnode);
-	device_set_node(&mdiodev->dev, fwnode);
-
-	/* All data is now stored in the mdiodev struct; register it. */
-	rc = mdio_device_register(mdiodev);
-	if (rc) {
-		mdio_device_free(mdiodev);
-		of_node_put(child);
-		return rc;
-	}
-
-	dev_dbg(&mdio->dev, "registered mdio device %pOFn at address %i\n",
-		child, addr);
-	return 0;
-}
-
 /* The following is a list of PHY compatible strings which appear in
  * some DTBs. The compatible string is never matched against a PHY
  * driver, so is pointless. We only expect devices which are not PHYs
@@ -133,57 +103,12 @@ EXPORT_SYMBOL(of_mdiobus_child_is_phy);
 int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 {
 	struct device_node *child;
-	bool scanphys = false;
 	int addr, rc;
 
-	if (!np)
-		return mdiobus_register(mdio);
-
-	/* Do not continue if the node is disabled */
-	if (!of_device_is_available(np))
-		return -ENODEV;
-
-	/* Mask out all PHYs from auto probing.  Instead the PHYs listed in
-	 * the device tree are populated after the bus has been registered */
-	mdio->phy_mask = ~0;
-
-	device_set_node(&mdio->dev, of_fwnode_handle(np));
-
-	/* Get bus level PHY reset GPIO details */
-	mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
-	of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);
-	mdio->reset_post_delay_us = 0;
-	of_property_read_u32(np, "reset-post-delay-us", &mdio->reset_post_delay_us);
-
-	/* Register the MDIO bus */
-	rc = mdiobus_register(mdio);
+	rc = fwnode_mdiobus_register(mdio, of_fwnode_handle(np));
 	if (rc)
 		return rc;
 
-	/* Loop over the child nodes and register a phy_device for each phy */
-	for_each_available_child_of_node(np, child) {
-		addr = of_mdio_parse_addr(&mdio->dev, child);
-		if (addr < 0) {
-			scanphys = true;
-			continue;
-		}
-
-		if (of_mdiobus_child_is_phy(child))
-			rc = of_mdiobus_register_phy(mdio, child, addr);
-		else
-			rc = of_mdiobus_register_device(mdio, child, addr);
-
-		if (rc == -ENODEV)
-			dev_err(&mdio->dev,
-				"MDIO device at address %d is missing.\n",
-				addr);
-		else if (rc)
-			goto unregister;
-	}
-
-	if (!scanphys)
-		return 0;
-
 	/* auto scan for PHYs with empty reg property */
 	for_each_available_child_of_node(np, child) {
 		/* Skip PHYs with reg property set */
-- 
2.34.1