| - maximum-speed: tells USB controllers we want to work up to a certain |
| speed. Valid arguments are "super-speed-plus", |
| "super-speed", "high-speed", "full-speed" and |
| "low-speed". In case this isn't passed via DT, USB |
| controllers should default to their maximum HW |
| - dr_mode: tells Dual-Role USB controllers that we want to work on a |
| particular mode. Valid arguments are "host", |
| "peripheral" and "otg". In case this attribute isn't |
| passed via DT, USB DRD controllers should default to |
| - phy_type: tells USB controllers that we want to configure the core to support |
| a UTMI+ PHY with an 8- or 16-bit interface if UTMI+ is |
| selected. Valid arguments are "utmi" and "utmi_wide". |
| In case this isn't passed via DT, USB controllers should |
| default to HW capability. |
| This is an attribute to a USB controller such as: |
| compatible = "synopsys,dwc3"; |
| reg = <0x4a030000 0xcfff>; |
| usb-phy = <&usb2_phy>, <&usb3,phy>; |
| maximum-speed = "super-speed"; |