[net-next PATCH v1 1/2] device property: Introduce fwnode_phy_find_device()

[Calvin Johnson]

Define fwnode_phy_find_device() to iterate an mdiobus and find the
phy device of the provided phy fwnode.

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

 drivers/base/property.c  | 41 ++++++++++++++++++++++++++++++++++++++++
 include/linux/property.h |  5 +++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 5f35c0ccf5e0..7c0c14c800b7 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -870,6 +870,47 @@ int device_get_phy_mode(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_get_phy_mode);
 
+/**
+ * fwnode_phy_find_device - Give a phy fwnode to find the corresponding
+ * phy_device on the mdiobus.
+ * @phy_fwnode: Pointer to the phy's fwnode.
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
+{
+	struct device *d;
+	struct mdio_device *mdiodev;
+
+	if (!phy_fwnode)
+		return NULL;
+
+	d = bus_find_device_by_fwnode(&mdio_bus_type, phy_fwnode);
+	if (d) {
+		mdiodev = to_mdio_device(d);
+		if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
+			return to_phy_device(d);
+		put_device(d);
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(fwnode_phy_find_device);
+
+/**
+ * device_phy_find_device - For the given device, get the phy_device
+ * @dev: Pointer to the given device
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *device_phy_find_device(struct device *dev)
+{
+	return fwnode_phy_find_device(dev_fwnode(dev));
+}
+EXPORT_SYMBOL_GPL(device_phy_find_device);
+
 static void *fwnode_get_mac_addr(struct fwnode_handle *fwnode,
 				 const char *name, char *addr,
 				 int alen)
diff --git a/include/linux/property.h b/include/linux/property.h
index d86de017c689..236d656a2981 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -370,9 +370,14 @@ const void *device_get_match_data(struct device *dev);
 
 int device_get_phy_mode(struct device *dev);
 
+struct phy_device *device_phy_find_device(struct device *dev);
+
 void *device_get_mac_address(struct device *dev, char *addr, int alen);
 
 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
+
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
+
 void *fwnode_get_mac_address(struct fwnode_handle *fwnode,
 			     char *addr, int alen);
 struct fwnode_handle *fwnode_graph_get_next_endpoint(
-- 
2.17.1