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

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>

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index 477d5bb5e51cf9089e900650279373fe89e37812..bba825711873f30d47b6cafa1ee941df57d73c7e 100644 (file)
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -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;
 };