Re: [net-next 8/9] dt-bindings: net: renesas,etheravb: Add optional gPTP phandle for Gen4

["Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>]

On 2026-06-13 12:04:09 +0200, Krzysztof Kozlowski wrote:
> On Wed, Jun 10, 2026 at 12:24:31PM +0200, Niklas Söderlund wrote:
> > The RAVB module on Gen4 have no gPTP clock as part of the RAVB module
> > itself, instead it relies on an external system wide gPTP clock. The
> > gPTP clock is shared with RTSN on V4H and RSWITCH on S4.
> > 
> > Add an optional phandle so that the RAVB driver can find and use the
> > gPTP clock. Ideally this should have been an mandatory property but for
> > backward compatible it is optional. The RAVB module is capable of
> > functioning without it, but can in such cases not provided PTP
> > functionality.
> > 
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > ---
> >  .../bindings/net/renesas,etheravb.yaml           | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/renesas,etheravb.yaml b/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> > index 1e00ef5b3acd..7bc910ab3ae0 100644
> > --- a/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> > +++ b/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> > @@ -122,6 +122,13 @@ properties:
> >        Specify when the AVB_LINK signal is active-low instead of normal
> >        active-high.
> >  
> > +  renesas,gptp:
> 
> Aren't you duplicating existing timestamper property? Aren't purpose of
> both the same?

Yes I am. I will switch to using the existing ptp-timer property. Thank 
you.

> 
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      A phandle to an external gPTP clock for Gen4 platforms. The property is
> 
> Explain the purpose of this in the hardware.
> 
> > +      optional for backwards compatibility, but without it gPTP timestamps are
> > +      disabled as Gen4 have no gPTP as part of the RAVB module itself.
> > +
> 
> Best regards,
> Krzysztof
> 

-- 
Kind Regards,
Niklas Söderlund