usb: cdns3: core: get role switch node from firmware

After that, the role switch device (eg, Type-C device) could call
cdns3_role_set to finish the role switch.
Signed-off-by: NPeter Chen <peter.chen@nxp.com>
Reviewed-by: NRoger Quadros <rogerq@ti.com>
Link: https://lore.kernel.org/r/20200331081005.32752-1-peter.chen@nxp.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/cdns3/core.c

@@ -528,6 +528,8 @@ static int cdns3_probe(struct platform_device *pdev)
 	sw_desc.get = cdns3_role_get;
 	sw_desc.allow_userspace_control = true;
 	sw_desc.driver_data = cdns;
+	if (device_property_read_bool(dev, "usb-role-switch"))
+		sw_desc.fwnode = dev->fwnode;
 
 	cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
 	if (IS_ERR(cdns->role_sw)) {