linux-kernel - RE: [PATCH net-next 0/3] ptp: add pulse signal loopback support for debugging

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Message-ID:
 <PAXPR04MB8510785442793740E5237AFA8800A@PAXPR04MB8510.eurprd04.prod.outlook.com>
Date: Thu, 4 Sep 2025 01:55:43 +0000
From: Wei Fang <wei.fang@....com>
To: Richard Cochran <richardcochran@...il.com>
CC: "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	Vladimir Oltean <vladimir.oltean@....com>, Clark Wang
	<xiaoning.wang@....com>, Frank Li <frank.li@....com>, "Y.B. Lu"
	<yangbo.lu@....com>, "christophe.leroy@...roup.eu"
	<christophe.leroy@...roup.eu>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linuxppc-dev@...ts.ozlabs.org"
	<linuxppc-dev@...ts.ozlabs.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>
Subject: RE: [PATCH net-next 0/3] ptp: add pulse signal loopback support for
 debugging

> On Wed, Sep 03, 2025 at 04:37:46PM +0800, Wei Fang wrote:
> > Some PTP devices support looping back the periodic pulse signal for
> > debugging,
> 
> What kinds of debugs can be resolved by this loopback feature?
> 
> It seems pointless to me...


Vladimir helped explain its purpose in the thread, do you still think
it is pointless? If so, then I can only add a custom debugfs interface
to the ptp_netc driver, at least this will be a better debugging feature
for the NETC Timer. :)