+static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
+{
+ struct device *dev = dwc->dev;
+ struct device_node *np_phy;
+ struct extcon_dev *edev = NULL;
+ const char *name;
+
+ if (device_property_read_bool(dev, "extcon"))
+ return extcon_get_edev_by_phandle(dev, 0);
+
+ /*
+ * Device tree platforms should get extcon via phandle.
+ * On ACPI platforms, we get the name from a device property.
+ * This device property is for kernel internal use only and
+ * is expected to be set by the glue code.
+ */
+ if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) {
+ edev = extcon_get_extcon_dev(name);
+ if (!edev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ return edev;
+ }
+
+ /*
+ * Try to get an extcon device from the USB PHY controller's "port"
+ * node. Check if it has the "port" node first, to avoid printing the
+ * error message from underlying code, as it's a valid case: extcon
+ * device (and "port" node) may be missing in case of "usb-role-switch"
+ * or OTG mode.
+ */
+ np_phy = of_parse_phandle(dev->of_node, "phys", 0);
+ if (of_graph_is_present(np_phy)) {
+ struct device_node *np_conn;
+
+ np_conn = of_graph_get_remote_node(np_phy, -1, -1);
+ if (np_conn)
+ edev = extcon_find_edev_by_node(np_conn);
+ of_node_put(np_conn);
+ }
+ of_node_put(np_phy);
+
+ return edev;
+}
+