[net-next PATCH v4 02/15] net: phy: Introduce fwnode_mdio_find_device()

[Calvin Johnson]

Define fwnode_mdio_find_device() to get a pointer to the
mdio_device from fwnode passed to the function.

Signed-off-by: Calvin Johnson <calvin.johnson@xxxxxxxxxxx>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/net/mdio/of_mdio.c   | 11 +----------
 drivers/net/phy/phy_device.c | 23 +++++++++++++++++++++++
 include/linux/phy.h          |  6 ++++++
 3 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 4daf94bb56a5..7bd33b930116 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -347,16 +347,7 @@ EXPORT_SYMBOL(of_mdiobus_register);
  */
 struct mdio_device *of_mdio_find_device(struct device_node *np)
 {
-	struct device *d;
-
-	if (!np)
-		return NULL;
-
-	d = bus_find_device_by_of_node(&mdio_bus_type, np);
-	if (!d)
-		return NULL;
-
-	return to_mdio_device(d);
+	return fwnode_mdio_find_device(of_fwnode_handle(np));
 }
 EXPORT_SYMBOL(of_mdio_find_device);
 
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 8447e56ba572..06e0ddcca8c9 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2829,6 +2829,29 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv)
 	return phydrv->config_intr && phydrv->handle_interrupt;
 }
 
+/**
+ * fwnode_mdio_find_device - Given a fwnode, find the mdio_device
+ * @np: pointer to the mdio_device's fwnode
+ *
+ * If successful, returns a pointer to the mdio_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ * The caller should call put_device() on the mdio_device after its use
+ */
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
+{
+	struct device *d;
+
+	if (!fwnode)
+		return NULL;
+
+	d = bus_find_device_by_fwnode(&mdio_bus_type, fwnode);
+	if (!d)
+		return NULL;
+
+	return to_mdio_device(d);
+}
+EXPORT_SYMBOL(fwnode_mdio_find_device);
+
 /**
  * phy_probe - probe and init a PHY device
  * @dev: device to probe and init
diff --git a/include/linux/phy.h b/include/linux/phy.h
index bc323fbdd21e..8314051d384a 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1349,11 +1349,17 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);
 #if IS_ENABLED(CONFIG_PHYLIB)
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode);
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
 void phy_device_free(struct phy_device *phydev);
 #else
 static inline
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
+{
+	return 0;
+}
+static inline
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 {
 	return NULL;
-- 
2.17.1