Kernel-4.18.0-80.el8_generic

Generic USB Properties

Optional properties:

• maximum-speed: tells USB controllers we want to work up to a certain

       speed. Valid arguments are "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 capability.
  

• 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
       OTG.
  

• 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.
  

• otg-rev: tells usb driver the release number of the OTG and EH supplement

       with which the device and its descriptors are compliant,
       in binary-coded decimal (i.e. 2.0 is 0200H). This
       property is used if any real OTG features(HNP/SRP/ADP)
       is enabled, if ADP is required, otg-rev should be
       0x0200 or above.
  

• companion: phandle of a companion
• hnp-disable: tells OTG controllers we want to disable OTG HNP, normally HNP

       is the basic function of real OTG except you want it
       to be a srp-capable only B device.
  

• srp-disable: tells OTG controllers we want to disable OTG SRP, SRP is

       optional for OTG device.
  

• adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is

       optional for OTG device.
  

This is an attribute to a USB controller such as:

dwc3@4a030000 {
compatible = “synopsys,dwc3”;
reg = <0x4a030000 0xcfff>;
interrupts = <0 92 4>
usb-phy = <&usb2_phy>, <&usb3,phy>;
maximum-speed = “super-speed”;
dr_mode = “otg”;
phy_type = “utmi_wide”;
otg-rev = <0x0200>;
adp-disable;
};