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", "high-speed", 6 "full-speed" and "low-speed". In case this isn't passed 7 via DT, USB controllers should default to their maximum 8 HW capability. 9 - dr_mode: tells Dual-Role USB controllers that we want to work on a 10 particular mode. Valid arguments are "host", 11 "peripheral" and "otg". In case this attribute isn't 12 passed via DT, USB DRD controllers should default to 13 OTG. 14 - otg-rev: tells usb driver the release number of the OTG and EH supplement 15 with which the device and its descriptors are compliant, 16 in binary-coded decimal (i.e. 2.0 is 0200H). This 17 property is used if any real OTG features(HNP/SRP/ADP) 18 is enabled, if ADP is required, otg-rev should be 19 0x0200 or above. 20 - hnp-disable: tells OTG controllers we want to disable OTG HNP, normally HNP 21 is the basic function of real OTG except you want it 22 to be a srp-capable only B device. 23 - srp-disable: tells OTG controllers we want to disable OTG SRP, SRP is 24 optional for OTG device. 25 - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is 26 optional for OTG device. 27 28This is an attribute to a USB controller such as: 29 30dwc3@4a030000 { 31 compatible = "synopsys,dwc3"; 32 reg = <0x4a030000 0xcfff>; 33 interrupts = <0 92 4> 34 usb-phy = <&usb2_phy>, <&usb3,phy>; 35 maximum-speed = "super-speed"; 36 dr_mode = "otg"; 37 otg-rev = <0x0200>; 38 adp-disable; 39}; 40