netdev - RE: [PATCH net-next 1/2] ptp: introduce PTP_CLOCK_EXTOFF event for the measured external offset

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Date: Wed, 29 Nov 2023 16:59:38 +0000
From: Min Li <min.li.xe@...esas.com>
To: Jakub Kicinski <kuba@...nel.org>, Min Li <lnimi@...mail.com>
CC: "richardcochran@...il.com" <richardcochran@...il.com>, "lee@...nel.org"
	<lee@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 1/2] ptp: introduce PTP_CLOCK_EXTOFF event for
 the measured external offset

> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: November 28, 2023 10:58 PM
> To: Min Li <lnimi@...mail.com>
> Cc: richardcochran@...il.com; lee@...nel.org; linux-
> kernel@...r.kernel.org; netdev@...r.kernel.org; Min Li
> <min.li.xe@...esas.com>
> Subject: Re: [PATCH net-next 1/2] ptp: introduce PTP_CLOCK_EXTOFF event
> for the measured external offset
> 
> On Mon, 27 Nov 2023 15:01:29 -0500 Min Li wrote:
> > This change is for the PHC devices that can measure the phase offset
> > between PHC signal and the external signal, such as the 1PPS signal of
> > GNSS. Reporting PTP_CLOCK_EXTOFF to user space will be piggy-backed to
> > the existing ptp_extts_event so that application such as ts2phc can
> > poll the external offset the same way as extts. Hence, ts2phc can use
> > the offset to achieve the alignment between PHC and the external
> > signal by the help of either SW or HW filters.
> 
> Does not apply to net-next.

Hi Jakub

I submitted an RFC last week and Richard was asking me to submit it together with a driver change as an example to implement it. Below is
Richard's quote

"Yes, the new option must wait for a driver that implements it.  Can you make a patch series where the driver change appears in the second patch?"

But the driver that I submitted is a brand new PHC driver. So I don't know if it is appropriate to separate them to net and net-next? Because the driver
change depends on the this patch.

Min