dm: usb: Allow ECHI to hold private data for the controller

Add a private data pointer that clients of EHCI can use to access their
private information. This establishes a link between struct ehci_ctrl and
its associated controller data structure.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/usb/host/ehci-hcd.c

@@ -930,6 +930,16 @@ unknown:
 	return -1;
 }
 
+void ehci_set_controller_priv(int index, void *priv)
+{
+	ehcic[index].priv = priv;
+}
+
+void *ehci_get_controller_priv(int index)
+{
+	return ehcic[index].priv;
+}
+
 int usb_lowlevel_stop(int index)
 {
 	ehci_shutdown(&ehcic[index]);

drivers/usb/host/ehci.h

@@ -248,6 +248,7 @@ struct ehci_ctrl {
 	uint32_t *periodic_list;
 	int periodic_schedules;
 	int ntds;
+	void *priv;	/* client's private data */
 };
 
 /* Weak functions that drivers can override */
@@ -256,6 +257,26 @@ void ehci_set_usbmode(int index);
 void ehci_powerup_fixup(uint32_t *status_reg, uint32_t *reg);
 uint32_t *ehci_get_portsc_register(struct ehci_hcor *hcor, int port);
 
+/**
+ * ehci_set_controller_priv() - Set up private data for the controller
+ *
+ * This function can be called in ehci_hcd_init() to tell the EHCI layer
+ * about the controller's private data pointer. Then in the above functions
+ * this can be accessed given the struct ehci_ctrl pointer.
+ *
+ * @index:	Controller number to set
+ * @priv:	Controller pointer
+ */
+void ehci_set_controller_priv(int index, void *priv);
+
+/**
+ * ehci_get_controller_priv() - Get controller private data
+ *
+ * @index	Controller number to get
+ * @return controller pointer for this index
+ */
+void *ehci_get_controller_priv(int index);
+
 /* Low level init functions */
 int ehci_hcd_init(int index, enum usb_init_type init,
 		struct ehci_hccr **hccr, struct ehci_hcor **hcor);