@@ -24,6 +24,8 @@
 #include <linux/usb/hcd.h>
 #include "usb.h"
 
+struct pwrseq;
+
 struct usb_hub {
 	struct device		*intfdev;	/* the "interface" device */
 	struct usb_device	*hdev;

@@ -101,6 +103,7 @@ struct usb_port {
 	struct usb_dev_state *port_owner;
 	struct usb_port *peer;
 	struct dev_pm_qos_request *req;
+	struct pwrseq *pwrseq;
 	enum usb_port_connect_type connect_type;
 	usb_port_location_t location;
 	struct mutex status_lock;

@@ -18,6 +18,8 @@
 
 #include <linux/slab.h>
 #include <linux/pm_qos.h>
+#include <linux/pwrseq.h>
+#include <linux/usb/of.h>
 
 #include "hub.h"
 

@@ -532,6 +534,14 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
 		return retval;
 	}
 
+	port_dev->dev.of_node = usb_of_get_child_node(hub->hdev->dev.of_node, port1);
+	port_dev->pwrseq = pwrseq_alloc(&port_dev->dev);
+	if (IS_ERR(port_dev->pwrseq)) {
+		device_unregister(&port_dev->dev);
+		/* TODO: what about EPROBE_DEFER? */
+		return PTR_ERR(port_dev->pwrseq);
+	}
+
 	find_and_link_peer(hub, port1);
 
 	/*

@@ -573,8 +583,13 @@ void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
 	struct usb_port *port_dev = hub->ports[port1 - 1];
 	struct usb_port *peer;
 
+	pwrseq_power_off(port_dev->pwrseq);
+
 	peer = port_dev->peer;
 	if (peer)
 		unlink_peers(port_dev, peer);
+
+	pwrseq_free(port_dev->pwrseq);
+	port_dev->pwrseq = NULL;
 	device_unregister(&port_dev->dev);
 }