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

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Hi Heikki,

Thanks for the feedback.

> Subject: Re: [PATCH v2 2/7] dt-bindings: usb: renesas_usb3: add usb-role-
> switch property
> 
> On Thu, Mar 14, 2019 at 10:14:12AM +0000, Biju Das wrote:
> > Hi Shimoda-San,
> >
> > Thanks for the feedback.
> >
> > > Subject: RE: [PATCH v2 2/7] dt-bindings: usb: renesas_usb3: add
> > > usb-role- switch property
> > >
> > > Hi Biju-san,
> > >
> > > > From: Biju Das, Sent: Thursday, March 14, 2019 5:40 PM
> > > >
> > > > Add support for renesas_usb3 to support dual role switch using usb
> > > > role switch class framework.
> > > >
> > > > Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
> > > > ---
> > > >  V1-->V2
> > > >   * Added usb-role-switch-property
> > > >   * Updated the example with usb-role-switch property.
> > > > ---
> > > >  .../devicetree/bindings/usb/renesas_usb3.txt       | 22
> > > ++++++++++++++++++++++
> > > >  1 file changed, 22 insertions(+)
> > > >
> > > > diff --git
> > > > 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?

Regards,
Biju







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