netdev - RE: [PATCH net-next v4 6/8] net: dsa: microchip: Enable Ethernet PTP detection

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Message-ID:
 <DM3PR11MB873640D9FA5A1CEC9EA36B2EEC9FA@DM3PR11MB8736.namprd11.prod.outlook.com>
Date: Fri, 30 Jan 2026 05:16:31 +0000
From: <Tristram.Ha@...rochip.com>
To: <kuba@...nel.org>, <bastien.curutchet@...tlin.com>
CC: <Woojung.Huh@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
	<andrew@...n.ch>, <olteanv@...il.com>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <pabeni@...hat.com>, <richardcochran@...il.com>,
	<horms@...nel.org>, <pascal.eberhard@...com>, <miquel.raynal@...tlin.com>,
	<thomas.petazzoni@...tlin.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next v4 6/8] net: dsa: microchip: Enable Ethernet PTP
 detection

> On Tue, 27 Jan 2026 10:06:48 +0100 Bastien Curutchet (Schneider
> Electric) wrote:
> > KSZ8463 needs to enable the Ethernet PTP detection to fire the
> > interrupts when a timestamp is captured.
> 
> Is it worth stating our expectation WRT other switches given this
> is a shared function (not advocating to add a condition to be clear,
> just document).

KSZ8464 uses the first generation of PTP engine while KSZ9477/KSZ9567 and
LAN937X use the second generation.  Most of their basic operations like
transmitting are the same.  KSZ8463 enables 1-step E2E TC operation by
default while the newer switches need to enable the function manually.
Because of that the PTP function in KSZ8463 is disabled after driver
starts until the Linux PTP stack wants to enable the feature.