netdev - 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: <bb07efd0-d429-4fe0-bb55-b50b77e1cf88@lunn.ch>
Date: Tue, 26 Aug 2025 04:22:03 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Wei Fang <wei.fang@....com>
Cc: "robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"richardcochran@...il.com" <richardcochran@...il.com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Clark Wang <xiaoning.wang@....com>,
	"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>,
	"vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>,
	Frank Li <frank.li@....com>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"festevam@...il.com" <festevam@...il.com>,
	"F.S. Peng" <fushi.peng@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [PATCH v5 net-next 08/15] ptp: netc: add debugfs support to loop
 back pulse signal

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