linux-kernel - Re: [PATCH net v4 2/2] phy: mscc: Fix PTP for VSC8574 and VSC8572

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Message-ID: <09b90c94-4b55-4b9f-a23b-e2bd920545bf@redhat.com>
Date: Tue, 21 Oct 2025 11:07:20 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>, andrew@...n.ch
Cc: Horatiu Vultur <horatiu.vultur@...rochip.com>, hkallweit1@...il.com,
 linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
 richardcochran@...il.com, vladimir.oltean@....com,
 vadim.fedorenko@...ux.dev, rmk+kernel@...linux.org.uk,
 christophe.jaillet@...adoo.fr, rosenp@...il.com,
 steen.hegelund@...rochip.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v4 2/2] phy: mscc: Fix PTP for VSC8574 and VSC8572

On 10/21/25 1:53 AM, Jakub Kicinski wrote:
> On Fri, 17 Oct 2025 08:48:19 +0200 Horatiu Vultur wrote:
>> For VSC8574 and VSC8572, the PTP initialization is incomplete. It is
>> missing the first part but it makes the second part. Meaning that the
>> ptp_clock_register() is never called.
>>
>> There is no crash without the first part when enabling PTP but this is
>> unexpected because some PHys have PTP functionality exposed by the
>> driver and some don't even though they share the same PTP clock PTP.
> 
> I'm tempted to queue this to net-next, sounds like a "never worked 
> in an obvious way" case.  I'd appreciate a second opinion.. Andrew?

FTR, I agree with the above, as (out of sheer ignorance) I think/fear
the first patch can potentially cause regressions.

/P