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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <13c4fe5a-878c-4a08-87df-f5bb96f0b589@lunn.ch>
Date: Mon, 25 Aug 2025 14:36:31 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Wei Fang <wei.fang@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	richardcochran@...il.com, claudiu.manoil@....com,
	vladimir.oltean@....com, xiaoning.wang@....com,
	andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, vadim.fedorenko@...ux.dev,
	Frank.Li@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
	festevam@...il.com, fushi.peng@....com, devicetree@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, kernel@...gutronix.de
Subject: Re: [PATCH v5 net-next 08/15] ptp: netc: add debugfs support to loop
 back pulse signal

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?

Ah:

ptp_qoriq_debugfs.c:	if (!debugfs_create_file_unsafe("fiper1-loopback", 0600, root,
ptp_qoriq_debugfs.c:	if (!debugfs_create_file_unsafe("fiper2-loopback", 0600, root,

Rather than hiding this in debugfs where each vendor will implement it
differently, i'm just think it might make sense to have an official
kernel API for it.

	Andrew