net: mdio: common handling of phy device reset properties

Unify the handling of the per device reset properties for
`mdio_device`.

Merge mdio_device_register_gpiod() and mdio_device_register_reset()
into mdio_device_register_reset(), that handles both
reset-controllers and reset-gpios.
Move reading of the reset firmware properties (reset-assert-us,
reset-deassert-us) from fwnode_mdio.c to mdio_device_register_reset(),
so all reset related initialization code is kept in one place.

Introduce mdio_device_unregister_reset() to release the associated
resources.

These changes make tracking the reset properties easier.
Added kernel-doc for mdio_device_register/unregister_reset().

Signed-off-by: Buday Csaba <[e-mail]>
Link: https://patch.msgid.link/17c[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/mdio/fwnode_mdio.c

···
 	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
 	 */

drivers/net/phy/mdio-private.h

···
  */
 
 int mdio_device_register_reset(struct mdio_device *mdiodev);
-int mdio_device_register_gpiod(struct mdio_device *mdiodev);
+void mdio_device_unregister_reset(struct mdio_device *mdiodev);
 
 #endif /* __MDIO_PRIVATE_H */

drivers/net/phy/mdio_bus.c

···
 		return -EBUSY;
 
 	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
-		err = mdio_device_register_gpiod(mdiodev);
+		err = mdio_device_register_reset(mdiodev);
 		if (err)
 			return err;
-
-		err = mdio_device_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);
···
 	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;
 

drivers/net/phy/mdio_device.c

···
 }
 EXPORT_SYMBOL(mdio_device_remove);
 
-int mdio_device_register_gpiod(struct mdio_device *mdiodev)
+/**
+ * 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 (mdiodev->reset_gpio)
 		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
 
-	return 0;
-}
-
-int mdio_device_register_reset(struct mdio_device *mdiodev)
-{
-	struct reset_control *reset;
-
 	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
-	if (IS_ERR(reset))
+	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 */
+	fwnode_property_read_u32(dev_fwnode(&mdiodev->dev), "reset-assert-us",
+				 &mdiodev->reset_assert_delay);
+	fwnode_property_read_u32(dev_fwnode(&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);
+	reset_control_put(mdiodev->reset_ctrl);
 }
 
 void mdio_device_reset(struct mdio_device *mdiodev, int value)