Re: [PATCH net-next V2] dt-bindings: net: ethernet-controller: Add ptp-hardware-clock

[Richard Cochran]

On Mon, Oct 24, 2022 at 11:57:23AM -0500, Rob Herring wrote:
> On Thu, Oct 20, 2022 at 11:41:10PM -0600, Sarath Babu Naidu Gaddam wrote:
> > There is currently no standard property to pass PTP device index
> > information to ethernet driver when they are independent.
> > 
> > ptp-hardware-clock property will contain phandle to PTP clock node.
> > 
> > Freescale driver currently has this implementation but it will be
> > good to agree on a generic (optional) property name to link to PTP
> > phandle to Ethernet node. In future or any current ethernet driver
> > wants to use this method of reading the PHC index,they can simply use
> > this generic name and point their own PTP clock node, instead of
> > creating separate property names in each ethernet driver DT node.
> 
> Seems like this does the same thing as 
> Documentation/devicetree/bindings/ptp/timestamper.txt.
> 
> Or perhaps what we have in bindings/timestamp/ which unfortunately does 
> about the same thing.
> 
> The latter one is more flexible and follows standard provider/consumer 
> patterns. So timestamper.txt should probably be deprecated.

I don't see how you can do that.  The provider/consumer semantics are
completely opposite.

The three (including present patch) bindings specify three different
relationships.

Thanks,
Richard