On Tue, Jun 16, 2015 at 11:21:15AM +0300, Roger Quadros wrote:
>
> On Tue, 16 Jun 2015 14:51:55 +0800
> Li Jun <[email protected]> wrote:
>
> > 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 <[email protected]>
> > ---
> > Documentation/devicetree/bindings/usb/generic.txt | 18 ++++++++++++++++++
> > 1 file changed, 18 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/generic.txt
> > b/Documentation/devicetree/bindings/usb/generic.txt
> > index 477d5bb..eb7308e 100644
> > --- a/Documentation/devicetree/bindings/usb/generic.txt
> > +++ b/Documentation/devicetree/bindings/usb/generic.txt
> > @@ -11,6 +11,20 @@ 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, also if ADP is enabled, otg-rev should be
> > + 0x0200 or above.
>
> How about saying "if ADP is required, otg-rev should be 0x0200 or above"
>
okay.
> > + - 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, if not passed, otg-rev should
> > + be set to be 0x0200 or above.
>
> Why should we place this constraint on DT? Isn't is better
> to handle it automatically in the USB code?
>
You are right, this can be done in USB code, I will remove this constraint
from it.
> Not specifying the disable flag doesn't mean that it has to be enabled.
> It means that enable it if it can be. i.e. supported by OTG rev and
> controller.
>
Exactly.
> >
> > This is an attribute to a USB controller such as:
> >
> > @@ -21,4 +35,8 @@ dwc3@4a030000 {
> > usb-phy = <&usb2_phy>, <&usb3,phy>;
> > maximum-speed = "super-speed";
> > dr_mode = "otg";
> > + otg-rev = <0x0200>;
> > + hnp-disable;
> > + srp-disable;
> > + adp-disable;
> > };
>
> How about a more real world example? We don't want hnp/srp disabled.
>
My fault, actually it's a wrong example, I will update with a typical
setting as you pointed.
Li Jun
> cheers,
> -roger
>
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