[v2,2/7] dt-bindings: usb: renesas_usb3: add usb-role-switch property

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

Thanks,

On Fri, Mar 15, 2019 at 09:08:19AM +0000, Biju Das wrote:
> > Subject: Re: [PATCH v2 2/7] dt-bindings: usb: renesas_usb3: add usb-role-
> > > > > a/Documentation/devicetree/bindings/usb/renesas_usb3.txt
> > > > > b/Documentation/devicetree/bindings/usb/renesas_usb3.txt
> > > > > index 35039e7..eecaf4c 100644
> > > > > --- a/Documentation/devicetree/bindings/usb/renesas_usb3.txt
> > > > > +++ b/Documentation/devicetree/bindings/usb/renesas_usb3.txt
> > > > > @@ -22,6 +22,7 @@ Required properties:
> > > > >  Optional properties:
> > > > >    - phys: phandle + phy specifier pair
> > > > >    - phy-names: must be "usb"
> > > > > +  - usb-role-switch: use USB role switch to support dual-role
> > > > > + switch
> > > >
> > > > I don't think we can add such a property. At least, we have to add
> > "renesas,"
> > > > prefix.
> > >
> > > usb_role_switch_get   api uses  "usb-role-switch"  property to get role
> > switch linked with the device.
> > >
> > > HD3SS3220 port controller driver gets role switch handle linked with the
> > device using usb_role_switch_get  api.
> > > That is the reason, I have added " usb-role-switch" property here.
> > >
> > > Do you have any other suggestion to get usb role switch handle?
> > 
> > We can still change the API. Can we use the compatible for this?
> 
> Do you mean usb_role_switch_get  API needs  to handle compatible "usb-x-connector"  wherex= a,b ,c ?
> Then it uses the graphs api to get the device linked with it and return the usb role switch handle.
> In that case, no need to add  generic "usb-role-switch"  property here.
> 
> Can you please confirm my understanding is correct?

No, I meant the compatible property would have the value
"usb-role-switch". Your compatible would probable look something
like this:

        compatible = "renesas,r8a774c0-usb3-peri",
                     "usb-role-switch";

So the idea would be that the device supplying USB role switch
functionality, in your case the USB controller, would need to have the
compatible property containing "usb-role-switch".

I'm really not an expert in DT, so I don't know if that is acceptable.
Rob can you comment on this?


thanks,