netdev - Re: [PATCH] ptp: Set lookup cookie when creating a PTP PPS source.

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Date:   Mon, 28 Jun 2021 16:38:35 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH] ptp: Set lookup cookie when creating a PTP PPS source.

On Mon, Jun 28, 2021 at 11:25:33AM -0700, Jonathan Lemon wrote:
> When creating a PTP device, the configuration block allows
> creation of an associated PPS device.  However, there isn't
> any way to associate the two devices after creation.
> 
> Set the PPS cookie, so pps_lookup_dev(ptp) performs correctly.

Setting lookup_cookie is harmless, AFAICT, but I wonder about the use
case.  The doc for pps_lookup_dev() says,

 * This is a bit of a kludge that is currently used only by the PPS                                                                      
 * serial line discipline.

and indeed that is the case.

The PHC devices are never serial ports, so how does this help?

Thanks,
Richard