Add an info level message when resetting a PHY before registration.

Signed-off-by: Buday Csaba <buday.csaba@prolan.hu>
---
V4 -> V5: moved the info message to a separate commit
---
 drivers/net/mdio/fwnode_mdio.c |  9 +++++++--
 drivers/net/phy/mdio_device.c  | 13 +++++++++++++
 include/linux/mdio.h           |  1 +
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index 9669da2b7..d753ebd37 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -133,8 +133,13 @@ static int fwnode_reset_phy(struct mii_bus *bus, u32 addr,
 		return rc;
 	}
 
-	mdio_device_reset(tmpdev, 1);
-	mdio_device_reset(tmpdev, 0);
+	if (mdio_device_has_reset(tmpdev)) {
+		dev_info(&bus->dev,
+			 "PHY device at address %d not detected, resetting PHY.\n",
+			 addr);
+		mdio_device_reset(tmpdev, 1);
+		mdio_device_reset(tmpdev, 0);
+	}
 
 	mdio_device_unregister_reset(tmpdev);
 	mdio_device_free(tmpdev);
diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c
index e24bce474..f2cbcb6bb 100644
--- a/drivers/net/phy/mdio_device.c
+++ b/drivers/net/phy/mdio_device.c
@@ -171,6 +171,19 @@ void mdio_device_remove(struct mdio_device *mdiodev)
 }
 EXPORT_SYMBOL(mdio_device_remove);
 
+/**
+ * mdio_device_has_reset - Check if an MDIO device has reset properties defined
+ * @mdiodev: mdio_device structure
+ *
+ * Return: non-zero if the device has a reset GPIO or reset controller,
+ *         zero otherwise.
+ */
+int mdio_device_has_reset(struct mdio_device *mdiodev)
+{
+	return (mdiodev->reset_gpio || mdiodev->reset_ctrl);
+}
+EXPORT_SYMBOL(mdio_device_has_reset);
+
 void mdio_device_reset(struct mdio_device *mdiodev, int value)
 {
 	unsigned int d;
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index d81b63fc7..83cfc051e 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -92,6 +92,7 @@ void mdio_device_free(struct mdio_device *mdiodev);
 struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
 int mdio_device_register_reset(struct mdio_device *mdiodev);
 void mdio_device_unregister_reset(struct mdio_device *mdiodev);
+int mdio_device_has_reset(struct mdio_device *mdiodev);
 int mdio_device_register(struct mdio_device *mdiodev);
 void mdio_device_remove(struct mdio_device *mdiodev);
 void mdio_device_reset(struct mdio_device *mdiodev, int value);
-- 
2.39.5