net: mdio: move device reset functions to mdio_device.c

The functions mdiobus_register_gpiod() and mdiobus_register_reset()
handle the mdio device reset initialization, which belong to
mdio_device.c.
Move them from mdio_bus.c to mdio_device.c, and rename them to match
the corresponding source file: mdio_device_register_gpio() and
mdio_device_register_reset().
Remove 'static' qualifiers and declare them in
drivers/net/phy/mdio-private.h (new header file).

Signed-off-by: Buday Csaba <[e-mail]>
Link: https://patch.msgid.link/5f6[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/mdio-private.h

···
+/* 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);
+int mdio_device_register_gpiod(struct mdio_device *mdiodev);
+
+#endif /* __MDIO_PRIVATE_H */

drivers/net/phy/mdio_bus.c

···
 #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)
 {
···
 		return -EBUSY;
 
 	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
-		err = mdiobus_register_gpiod(mdiodev);
+		err = mdio_device_register_gpiod(mdiodev);
 		if (err)
 			return err;
 
-		err = mdiobus_register_reset(mdiodev);
+		err = mdio_device_register_reset(mdiodev);
 		if (err) {
 			gpiod_put(mdiodev->reset_gpio);
 			mdiodev->reset_gpio = NULL;

drivers/net/phy/mdio_device.c

···
 #include <linux/string.h>
 #include <linux/unistd.h>
 #include <linux/property.h>
+#include "mdio-private.h"
 
 void mdio_device_free(struct mdio_device *mdiodev)
 {
···
 	mdiobus_unregister_device(mdiodev);
 }
 EXPORT_SYMBOL(mdio_device_remove);
+
+int mdio_device_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;
+}
+
+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))
+		return PTR_ERR(reset);
+
+	mdiodev->reset_ctrl = reset;
+
+	return 0;
+}
 
 void mdio_device_reset(struct mdio_device *mdiodev, int value)
 {