net: mdiobus: Introduce fwnode_mdbiobus_register()

This patch introduces a new helper function that
wraps acpi_/of_ mdiobus_register() and allows its
usage via common fwnode_ interface.

Fall back to raw mdiobus_register() in case CONFIG_FWNODE_MDIO
is not enabled, in order to satisfy compatibility
in all future user drivers.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mdio/fwnode_mdio.c

@@ -7,8 +7,10 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
 #include <linux/fwnode_mdio.h>
 #include <linux/of.h>
+#include <linux/of_mdio.h>
 #include <linux/phy.h>
 
 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
@@ -142,3 +144,23 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 	return 0;
 }
 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
+
+/**
+ * fwnode_mdiobus_register - bring up all the PHYs on a given MDIO bus and
+ *	attach them to it.
+ * @bus: Target MDIO bus.
+ * @fwnode: Pointer to fwnode of the MDIO controller.
+ *
+ * Return values are determined accordingly to acpi_/of_ mdiobus_register()
+ * operation.
+ */
+int fwnode_mdiobus_register(struct mii_bus *bus, struct fwnode_handle *fwnode)
+{
+	if (is_acpi_node(fwnode))
+		return acpi_mdiobus_register(bus, fwnode);
+	else if (is_of_node(fwnode))
+		return of_mdiobus_register(bus, to_of_node(fwnode));
+	else
+		return -EINVAL;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register);

include/linux/fwnode_mdio.h

@@ -16,6 +16,7 @@ int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 				struct fwnode_handle *child, u32 addr);
 
+int fwnode_mdiobus_register(struct mii_bus *bus, struct fwnode_handle *fwnode);
 #else /* CONFIG_FWNODE_MDIO */
 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
 				       struct phy_device *phy,
@@ -30,6 +31,17 @@ static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 {
 	return -EINVAL;
 }
+
+static inline int fwnode_mdiobus_register(struct mii_bus *bus,
+					  struct fwnode_handle *fwnode)
+{
+	/*
+	 * Fall back to mdiobus_register() function to register a bus.
+	 * This way, we don't have to keep compat bits around in drivers.
+	 */
+
+	return mdiobus_register(mdio);
+}
 #endif
 
 #endif /* __LINUX_FWNODE_MDIO_H */