netdev - [net-next PATCH v7 2/6] net: phy: introduce device_mdiobus

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Message-Id: <20200715090400.4733-3-calvin.johnson@oss.nxp.com>
Date:   Wed, 15 Jul 2020 14:33:56 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Jeremy Linton <jeremy.linton@....com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Jon <jon@...id-run.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Madalin Bucur <madalin.bucur@....nxp.com>
Cc:     netdev@...r.kernel.org, linux.cj@...il.com,
        linux-acpi@...r.kernel.org,
        Calvin Johnson <calvin.johnson@....nxp.com>
Subject: [net-next PATCH v7 2/6] net: phy: introduce device_mdiobus_register()

Introduce device_mdiobus_register() to register mdiobus
in cases of either DT or ACPI.

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

---

Changes in v7: None
Changes in v6:
- change device_mdiobus_register() parameter position
- improve documentation

Changes in v5:
- add description
- clean up if else

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

 drivers/net/phy/mdio_bus.c | 26 ++++++++++++++++++++++++++
 include/linux/mdio.h       |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 46b33701ad4b..8610f938f81f 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -501,6 +501,32 @@ static int mdiobus_create_device(struct mii_bus *bus,
 	return ret;
 }
 
+/**
+ * device_mdiobus_register - register mdiobus for either DT or ACPI
+ * @bus: target mii_bus
+ * @dev: given MDIO device
+ *
+ * Description: Given an MDIO device and target mii bus, this function
+ * calls of_mdiobus_register() for DT node and mdiobus_register() in
+ * case of ACPI.
+ *
+ * Returns 0 on success or negative error code on failure.
+ */
+int device_mdiobus_register(struct device *dev,
+			    struct mii_bus *bus)
+{
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+
+	if (is_of_node(fwnode))
+		return of_mdiobus_register(bus, to_of_node(fwnode));
+	if (fwnode) {
+		bus->dev.fwnode = fwnode;
+		return mdiobus_register(bus);
+	}
+	return -ENODEV;
+}
+EXPORT_SYMBOL(device_mdiobus_register);
+
 /**
  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
  * @bus: target mii_bus
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 898cbf00332a..f454c5435101 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -358,6 +358,7 @@ static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 	return mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
 }
 
+int device_mdiobus_register(struct device *dev, struct mii_bus *bus);
 int mdiobus_register_device(struct mdio_device *mdiodev);
 int mdiobus_unregister_device(struct mdio_device *mdiodev);
 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
-- 
2.17.1