dm: usb: Allow setting up a USB controller as a device/gadget

Some controllers support OTG (on-the-go) where they can operate as either
host or device. The gadget layer in U-Boot supports this.

While this layer does not interact with driver model, we can provide a
function which sets up the controller in the correct way. This way the code
at least builds (although it likely will not work).

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/usb/gadget/ci_udc.c

@@ -883,7 +883,11 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 	if (driver->speed != USB_SPEED_FULL && driver->speed != USB_SPEED_HIGH)
 		return -EINVAL;
 
+#ifdef CONFIG_DM_USB
+	ret = usb_setup_ehci_gadget(&controller.ctrl);
+#else
 	ret = usb_lowlevel_init(0, USB_INIT_DEVICE, (void **)&controller.ctrl);
+#endif
 	if (ret)
 		return ret;
 

drivers/usb/host/usb-uclass.c

@@ -249,6 +249,30 @@ int usb_legacy_port_reset(struct usb_device *parent, int portnr)
 	return usb_port_reset(parent, portnr);
 }
 
+int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
+{
+	struct usb_platdata *plat;
+	struct udevice *dev;
+	int ret;
+
+	/* Find the old device and remove it */
+	ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
+	if (ret)
+		return ret;
+	ret = device_remove(dev);
+	if (ret)
+		return ret;
+
+	plat = dev_get_platdata(dev);
+	plat->init_type = USB_INIT_DEVICE;
+	ret = device_probe(dev);
+	if (ret)
+		return ret;
+	*ctlrp = dev_get_priv(dev);
+
+	return 0;
+}
+
 /* returns 0 if no match, 1 if match */
 int usb_match_device(const struct usb_device_descriptor *desc,
 		     const struct usb_device_id *id)