usb: dwc3: pci: Intel Merrifield can be host

On Intel Edison board the OTG function is enabled, thus,
USB can switch to the host mode.

Allow that by changing dr_mode property to "otg" for Intel Merrifield.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/dwc3-pci.c

@@ -107,6 +107,12 @@ static const struct property_entry dwc3_pci_intel_properties[] = {
 	{}
 };
 
+static const struct property_entry dwc3_pci_mrfld_properties[] = {
+	PROPERTY_ENTRY_STRING("dr_mode", "otg"),
+	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
+	{}
+};
+
 static const struct property_entry dwc3_pci_amd_properties[] = {
 	PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
 	PROPERTY_ENTRY_U8("snps,lpm-nyet-threshold", 0xf),
@@ -295,7 +301,7 @@ static const struct pci_device_id dwc3_pci_id_table[] = {
 	  (kernel_ulong_t) &dwc3_pci_intel_properties, },
 
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MRFLD),
-	  (kernel_ulong_t) &dwc3_pci_intel_properties, },
+	  (kernel_ulong_t) &dwc3_pci_mrfld_properties, },
 
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SPTLP),
 	  (kernel_ulong_t) &dwc3_pci_intel_properties, },