linux-kernel - Re: [PATCH net-next v5 1/2] ptp: introduce Alibaba CIPU PHC driver

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Message-ID: <20251216135848.174e010f@kernel.org>
Date: Tue, 16 Dec 2025 13:58:48 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Wen Gu <guwen@...ux.alibaba.com>
Cc: Richard Cochran <richardcochran@...il.com>, andrew+netdev@...n.ch,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 xuanzhuo@...ux.alibaba.com, dust.li@...ux.alibaba.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Thomas Gleixner
 <tglx@...utronix.de>
Subject: Re: [PATCH net-next v5 1/2] ptp: introduce Alibaba CIPU PHC driver

On Sun, 14 Dec 2025 22:03:57 +0800 Wen Gu wrote:
> If you're suggesting creating a new subsystem, I think we should first
> answer this question: why can't it be part of the current ptp subsystem,
> and what are the differences between the drivers under `drivers/ptp`
> and those in the new subsystem?

I can't explain it any better than I already did here:
https://lore.kernel.org/all/20251127083610.6b66a728@kernel.org/

I talked to Thomas Gleixner (added to CC) during LPC and he seemed
open to creating a PHC subsystem for pure time devices in virtualized
environments. Please work with him and other vendors trying to
upstream similar drivers.