linux-kernel - Re: [net-next PATCH] octeontx2: Add PTP clock driver for Octeon PTM clock.

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Date: Thu, 25 Jan 2024 16:11:02 -0800
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Sai Krishna <saikrishnag@...vell.com>, richardcochran@...il.com,
 davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, sgoutham@...vell.com, gakula@...vell.com,
 lcherian@...vell.com, hkelam@...vell.com, sbhatta@...vell.com
Cc: Sai Krishna <saikrishnag@...vell.com>, Naveen Mamindlapalli
 <naveenm@...vell.com>
Subject: Re: [net-next PATCH] octeontx2: Add PTP clock driver for Octeon PTM
 clock.

Sai Krishna <saikrishnag@...vell.com> writes:

> The PCIe PTM(Precision time measurement) protocol provides precise
> coordination of events across multiple components like PCIe host
> clock, PCIe EP PHC local clocks of PCIe devices. This patch adds
> support for ptp clock based PTM clock. We can use this PTP device
> to sync the PTM time with CLOCK_REALTIME or other PTP PHC
> devices using phc2sys.
>
> Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
> Signed-off-by: Naveen Mamindlapalli <naveenm@...vell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> ---

I can see that the same device id (PCI_DEVID_OCTEONTX2_PTP) is used by a
ethernet driver.

That brings me a question: why expose a different PTP chardev? In other
words, why can't you just implement .getcrosststamp() for that ethernet
device?

Cheers,
-- 
Vinicius