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path: root/drivers/usb/common/common.c
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Diffstat (limited to 'drivers/usb/common/common.c')
-rw-r--r--drivers/usb/common/common.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 50a2362ed3ea..48277bbc15e4 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -246,6 +246,31 @@ int of_usb_update_otg_caps(struct device_node *np,
}
EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
+/**
+ * usb_of_get_companion_dev - Find the companion device
+ * @dev: the device pointer to find a companion
+ *
+ * Find the companion device from platform bus.
+ *
+ * Takes a reference to the returned struct device which needs to be dropped
+ * after use.
+ *
+ * Return: On success, a pointer to the companion device, %NULL on failure.
+ */
+struct device *usb_of_get_companion_dev(struct device *dev)
+{
+ struct device_node *node;
+ struct platform_device *pdev = NULL;
+
+ node = of_parse_phandle(dev->of_node, "companion", 0);
+ if (node)
+ pdev = of_find_device_by_node(node);
+
+ of_node_put(node);
+
+ return pdev ? &pdev->dev : NULL;
+}
+EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
#endif
MODULE_LICENSE("GPL");