Merge branch 'net-mdio-improve-reset-handling-of-mdio-devices'

Buday Csaba says:

====================
net: mdio: improve reset handling of mdio devices

This patchset refactors and slightly improves the reset handling of
`mdio_device`.

The patches were split from a larger series, discussed previously in the
links below.

The difference between v2 and v3, is that the helper function declarations
have been moved to a new header file: drivers/net/phy/mdio-private.h
See links for the previous versions, and for the now separate leak fix.
====================

Link: https://patch.msgid.link/cover.1763473655.git.buday.csaba@prolan.hu
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 68 insertions, 42 deletions

diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index 9b41d4697a40..ba7091518265 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -92,11 +92,6 @@ int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
 	if (fwnode_property_read_bool(child, "broken-turn-around"))
 		mdio->phy_ignore_ta_mask |= 1 << addr;
 
-	fwnode_property_read_u32(child, "reset-assert-us",
-				 &phy->mdio.reset_assert_delay);
-	fwnode_property_read_u32(child, "reset-deassert-us",
-				 &phy->mdio.reset_deassert_delay);
-
 	/* Associate the fwnode with the device structure so it
 	 * can be looked up later
 	 */
diff --git a/drivers/net/phy/mdio-private.h b/drivers/net/phy/mdio-private.h
new file mode 100644
index 000000000000..8bc6d9088af1
--- /dev/null
+++ b/drivers/net/phy/mdio-private.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __MDIO_PRIVATE_H
+#define __MDIO_PRIVATE_H
+
+/* MDIO internal helpers
+ */
+
+int mdio_device_register_reset(struct mdio_device *mdiodev);
+void mdio_device_unregister_reset(struct mdio_device *mdiodev);
+
+#endif /* __MDIO_PRIVATE_H */
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 4354241137d5..ef041ad66852 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -29,37 +29,11 @@
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>
+#include "mdio-private.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/mdio.h>
 
-static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
-{
-	/* Deassert the optional reset signal */
-	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
-						 "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(mdiodev->reset_gpio))
-		return PTR_ERR(mdiodev->reset_gpio);
-
-	if (mdiodev->reset_gpio)
-		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
-
-	return 0;
-}
-
-static int mdiobus_register_reset(struct mdio_device *mdiodev)
-{
-	struct reset_control *reset;
-
-	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
-	if (IS_ERR(reset))
-		return PTR_ERR(reset);
-
-	mdiodev->reset_ctrl = reset;
-
-	return 0;
-}
-
 int mdiobus_register_device(struct mdio_device *mdiodev)
 {
 	int err;
@@ -68,17 +42,10 @@ int mdiobus_register_device(struct mdio_device *mdiodev)
 		return -EBUSY;
 
 	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
-		err = mdiobus_register_gpiod(mdiodev);
+		err = mdio_device_register_reset(mdiodev);
 		if (err)
 			return err;
 
-		err = mdiobus_register_reset(mdiodev);
-		if (err) {
-			gpiod_put(mdiodev->reset_gpio);
-			mdiodev->reset_gpio = NULL;
-			return err;
-		}
-
 		/* Assert the reset signal */
 		mdio_device_reset(mdiodev, 1);
 	}
@@ -94,8 +61,7 @@ int mdiobus_unregister_device(struct mdio_device *mdiodev)
 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
 		return -EINVAL;
 
-	gpiod_put(mdiodev->reset_gpio);
-	reset_control_put(mdiodev->reset_ctrl);
+	mdio_device_unregister_reset(mdiodev);
 
 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
 
diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c
index f64176e0e197..fd0e16dbc5cc 100644
--- a/drivers/net/phy/mdio_device.c
+++ b/drivers/net/phy/mdio_device.c
@@ -22,6 +22,7 @@
 #include <linux/string.h>
 #include <linux/unistd.h>
 #include <linux/property.h>
+#include "mdio-private.h"
 
 void mdio_device_free(struct mdio_device *mdiodev)
 {
@@ -118,6 +119,59 @@ void mdio_device_remove(struct mdio_device *mdiodev)
 }
 EXPORT_SYMBOL(mdio_device_remove);
 
+/**
+ * mdio_device_register_reset - Read and initialize the reset properties of
+ *				an mdio device
+ * @mdiodev: mdio_device structure
+ *
+ * Return: Zero if successful, negative error code on failure
+ */
+int mdio_device_register_reset(struct mdio_device *mdiodev)
+{
+	struct reset_control *reset;
+
+	/* Deassert the optional reset signal */
+	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
+						 "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(mdiodev->reset_gpio))
+		return PTR_ERR(mdiodev->reset_gpio);
+
+	if (mdiodev->reset_gpio)
+		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
+
+	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
+	if (IS_ERR(reset)) {
+		gpiod_put(mdiodev->reset_gpio);
+		mdiodev->reset_gpio = NULL;
+		return PTR_ERR(reset);
+	}
+
+	mdiodev->reset_ctrl = reset;
+
+	/* Read optional firmware properties */
+	device_property_read_u32(&mdiodev->dev, "reset-assert-us",
+				 &mdiodev->reset_assert_delay);
+	device_property_read_u32(&mdiodev->dev, "reset-deassert-us",
+				 &mdiodev->reset_deassert_delay);
+
+	return 0;
+}
+
+/**
+ * mdio_device_unregister_reset - uninitialize the reset properties of
+ *				  an mdio device
+ * @mdiodev: mdio_device structure
+ */
+void mdio_device_unregister_reset(struct mdio_device *mdiodev)
+{
+	gpiod_put(mdiodev->reset_gpio);
+	mdiodev->reset_gpio = NULL;
+	reset_control_put(mdiodev->reset_ctrl);
+	mdiodev->reset_ctrl = NULL;
+	mdiodev->reset_assert_delay = 0;
+	mdiodev->reset_deassert_delay = 0;
+}
+
 void mdio_device_reset(struct mdio_device *mdiodev, int value)
 {
 	unsigned int d;