usb/host: introduce USB_ARCH_HAS_XHCI

to make it look like OHCI and EHCI, we introduce
that symbol and USB_XHCI_HCD depend on that
instead of PCI.

[bigeasy@linutronix.de: wire up USB_ARCH_HAS_HCD]
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/Kconfig

@@ -24,6 +24,7 @@ config USB_ARCH_HAS_HCD
 	boolean
 	default y if USB_ARCH_HAS_OHCI
 	default y if USB_ARCH_HAS_EHCI
+	default y if USB_ARCH_HAS_XHCI
 	default y if PCMCIA && !M32R			# sl811_cs
 	default y if ARM				# SL-811
 	default y if BLACKFIN				# SL-811
@@ -77,6 +78,11 @@ config USB_ARCH_HAS_EHCI
 	default y if ARCH_MMP
 	default PCI
 
+# some non-PCI HCDs implement xHCI
+config USB_ARCH_HAS_XHCI
+	boolean
+	default PCI
+
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
 config USB
 	tristate "Support for Host-side USB"

drivers/usb/host/Kconfig

@@ -19,7 +19,7 @@ config USB_C67X00_HCD
 
 config USB_XHCI_HCD
 	tristate "xHCI HCD (USB 3.0) support (EXPERIMENTAL)"
-	depends on USB && PCI && EXPERIMENTAL
+	depends on USB && USB_ARCH_HAS_XHCI && EXPERIMENTAL
 	---help---
 	  The eXtensible Host Controller Interface (xHCI) is standard for USB 3.0
 	  "SuperSpeed" host controller hardware.