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

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Message-ID: <20251031165820.70353b68@kernel.org>
Date: Fri, 31 Oct 2025 16:58:20 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Wen Gu <guwen@...ux.alibaba.com>
Cc: 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
Subject: Re: [PATCH net-next v5 1/2] ptp: introduce Alibaba CIPU PHC driver

On Thu, 30 Oct 2025 20:13:13 +0800 Wen Gu wrote:
> This adds a driver for Alibaba CIPU PTP clock. The CIPU, an underlying
> infrastructure of Alibaba Cloud, synchronizes time with atomic clocks
> via the network and provides microsecond or sub-microsecond precision
> timestamps for VMs and bare metals on cloud.
> 
> User space processes, such as chrony, running in VMs or on bare metals
> can get the high precision time through the PTP device exposed by this
> driver.

As mentioned on previous revisions this is a pure clock device which has
nothing to do with networking and PTP. There should be a separate class
for "hypervisor clocks", if not a common driver.
-- 
pw-bot: cr