PXA USB controllers

OHCI

Required properties:
 - compatible: Should be "marvell,pxa-ohci" for USB controllers
   used in host mode.

Optional properties:
 - "marvell,enable-port1", "marvell,enable-port2", "marvell,enable-port3"
   If present, enables the appropriate USB port of the controller.
 - "marvell,port-mode" selects the mode of the ports:
	1 = PMM_NPS_MODE
	2 = PMM_GLOBAL_MODE
	3 = PMM_PERPORT_MODE
 - "marvell,power-sense-low" - power sense pin is low-active.
 - "marvell,power-control-low" - power control pin is low-active.
 - "marvell,no-oc-protection" - disable over-current protection.
 - "marvell,oc-mode-perport" - enable per-port over-current protection.
 - "marvell,power_on_delay" Power On to Power Good time - in ms.

Example:

	usb0: ohci@4c000000 {
		compatible = "marvell,pxa-ohci", "usb-ohci";
		reg = <0x4c000000 0x100000>;
		interrupts = <18>;
		marvell,enable-port1;
		marvell,port-mode = <2>; /* PMM_GLOBAL_MODE */
	};