1Generic USB Properties
2
3Optional properties:
4 - maximum-speed: tells USB controllers we want to work up to a certain
5			speed. Valid arguments are "super-speed-plus",
6			"super-speed", "high-speed", "full-speed" and
7			"low-speed". In case this isn't passed via DT, USB
8			controllers should default to their maximum HW
9			capability.
10 - dr_mode: tells Dual-Role USB controllers that we want to work on a
11			particular mode. Valid arguments are "host",
12			"peripheral" and "otg". In case this attribute isn't
13			passed via DT, USB DRD controllers should default to
14			OTG.
15 - phy_type: tells USB controllers that we want to configure the core to support
16			a UTMI+ PHY with an 8- or 16-bit interface if UTMI+ is
17			selected. Valid arguments are "utmi" and "utmi_wide".
18			In case this isn't passed via DT, USB controllers should
19			default to HW capability.
20
21This is an attribute to a USB controller such as:
22
23dwc3@4a030000 {
24	compatible = "synopsys,dwc3";
25	reg = <0x4a030000 0xcfff>;
26	interrupts = <0 92 4>
27	usb-phy = <&usb2_phy>, <&usb3,phy>;
28	maximum-speed = "super-speed";
29	dr_mode = "otg";
30	phy_type = "utmi_wide";
31};
32