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

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Message-ID:
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Date: Tue, 26 Aug 2025 01:50:06 +0000
From: Wei Fang <wei.fang@....com>
To: Andrew Lunn <andrew@...n.ch>
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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?

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").

> 
> 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.
>