usb: gadget: mtu3: Convert interrupt handling to usb_gadget_generic_ops

Implement .handle_interrupts callback as a replacement for deprecated
dm_usb_gadget_handle_interrupts() function. The new callback allows
for each DM capable USB gadget controller driver to define its own
IRQ handling implementation without colliding with other controller
drivers.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # vim3
Link: https://lore.kernel.org/r/20240614005309.34433-7-marek.vasut+renesas@mailbox.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index ca86b58..f8e14ea 100644
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -223,15 +223,6 @@
 };
 
 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
-int dm_usb_gadget_handle_interrupts(struct udevice *dev)
-{
-	struct mtu3 *mtu = dev_get_priv(dev);
-
-	mtu3_irq(0, mtu);
-
-	return 0;
-}
-
 static int mtu3_gadget_probe(struct udevice *dev)
 {
 	struct ssusb_mtk *ssusb = dev_to_ssusb(dev->parent);
@@ -250,10 +241,24 @@
 	return 0;
 }
 
+static int mtu3_gadget_handle_interrupts(struct udevice *dev)
+{
+	struct mtu3 *mtu = dev_get_priv(dev);
+
+	mtu3_irq(0, mtu);
+
+	return 0;
+}
+
+static const struct usb_gadget_generic_ops mtu3_gadget_ops = {
+	.handle_interrupts	= mtu3_gadget_handle_interrupts,
+};
+
 U_BOOT_DRIVER(mtu3_peripheral) = {
 	.name = "mtu3-peripheral",
 	.id = UCLASS_USB_GADGET_GENERIC,
 	.of_match = ssusb_of_match,
+	.ops = &mtu3_gadget_ops,
 	.probe = mtu3_gadget_probe,
 	.remove = mtu3_gadget_remove,
 	.priv_auto	= sizeof(struct mtu3),