46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
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Generic USB Properties
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Optional properties:
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- maximum-speed: tells USB controllers we want to work up to a certain
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speed. Valid arguments are "super-speed", "high-speed",
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"full-speed" and "low-speed". In case this isn't passed
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via DT, USB controllers should default to their maximum
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HW capability.
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- dr_mode: tells Dual-Role USB controllers that we want to work on a
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particular mode. Valid arguments are "host",
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"peripheral" and "otg". In case this attribute isn't
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passed via DT, USB DRD controllers should default to
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OTG.
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- phy_type: tells USB controllers that we want to configure the core to support
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a UTMI+ PHY with an 8- or 16-bit interface if UTMI+ is
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selected. Valid arguments are "utmi" and "utmi_wide".
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In case this isn't passed via DT, USB controllers should
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default to HW capability.
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- otg-rev: tells usb driver the release number of the OTG and EH supplement
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with which the device and its descriptors are compliant,
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in binary-coded decimal (i.e. 2.0 is 0200H). This
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property is used if any real OTG features(HNP/SRP/ADP)
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is enabled, if ADP is required, otg-rev should be
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0x0200 or above.
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- hnp-disable: tells OTG controllers we want to disable OTG HNP, normally HNP
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is the basic function of real OTG except you want it
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to be a srp-capable only B device.
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- srp-disable: tells OTG controllers we want to disable OTG SRP, SRP is
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optional for OTG device.
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- adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
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optional for OTG device.
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This is an attribute to a USB controller such as:
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dwc3@4a030000 {
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compatible = "synopsys,dwc3";
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reg = <0x4a030000 0xcfff>;
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interrupts = <0 92 4>
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usb-phy = <&usb2_phy>, <&usb3,phy>;
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maximum-speed = "super-speed";
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dr_mode = "otg";
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phy_type = "utmi_wide";
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otg-rev = <0x0200>;
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adp-disable;
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};
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