usb: dwc3: pci: add dr-mode for Intel dwc3

It's know that Intel's SoCs' dwc3 integration is
peripheral-only since Intel implements its own
portmux for role-swapping. In order to prevent dwc3
from ever registering and XHCI platform_device,
let's just set dr-mode to peripheral-only on Intel
SoCs.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/dwc3-pci.c

@@ -76,8 +76,19 @@ static int dwc3_pci_quirks(struct pci_dev *pdev, struct platform_device *dwc3)
 		return platform_device_add_properties(dwc3, properties);
 	}
 
-	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
-	    pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
+		int ret;
+
+		struct property_entry properties[] = {
+			PROPERTY_ENTRY_STRING("dr-mode", "peripheral"),
+			{ }
+		};
+
+		ret = platform_device_add_properties(dwc3, properties);
+		if (ret < 0)
+			return ret;
+
+		if (pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
 			struct gpio_desc *gpio;
 
 			acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
@@ -105,6 +116,7 @@ static int dwc3_pci_quirks(struct pci_dev *pdev, struct platform_device *dwc3)
 				usleep_range(10000, 11000);
 			}
 		}
+	}
 
 	if (pdev->vendor == PCI_VENDOR_ID_SYNOPSYS &&
 	    (pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3 ||