Re: [PATCH v5 net-next 08/15] ptp: netc: add debugfs support to loop back pulse signal

[Andrew Lunn]

On Tue, Aug 26, 2025 at 01:50:06AM +0000, Wei Fang wrote:
> > On Mon, Aug 25, 2025 at 12:15:25PM +0800, Wei Fang wrote:
> > > The NETC Timer supports to loop back the output pulse signal of Fiper-n
> > > into Trigger-n input, so that we can leverage this feature to validate
> > > some other features without external hardware support.
> > 
> > This seems like it should be a common feature which more PTP clocks
> > will support? Did you search around and see if there are other devices
> > with this?
> 
> Actually, the NETC v4 Timer is the same IP used in the QorIQ platforms,
> but it is a different version, and the ptp_qoriq driver is not compatible
> with NETC v4 Timer, I have stated in the patch ("ptp: netc: add NETC V4
> Timer PTP driver support").

That does not answer my question. Does Marvell have this loopback
concept? Intel? Freescale? Microchip? Is there anything which prevents
other vendors implementing it?

	Andrew