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doc: dt-binding: usb: add otg related properties

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Add otg version, srp, hnp and adp support for usb OTG port, then those OTG
features don't have to be decided by usb gadget drivers.

Signed-off-by: Li Jun <jun.li@freescale.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Li Jun 2015-07-09 15:18:43 +08:00 committed by Felipe Balbi
parent 53e6242db8
commit b5513dede7
1 changed files with 15 additions and 0 deletions
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15
Documentation/devicetree/bindings/usb/generic.txt
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@ -11,6 +11,19 @@ Optional properties:
"peripheral" and "otg". In case this attribute isn't
passed via DT, USB DRD controllers should default to
OTG.
- 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.
- 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:
@ -21,4 +34,6 @@ dwc3@4a030000 {
usb-phy = <&usb2_phy>, <&usb3,phy>;
maximum-speed = "super-speed";
dr_mode = "otg";
otg-rev = <0x0200>;
adp-disable;
};