linux-kernel - Re: [PATCH net-next 2/3] net: stmmac: Allow supporting coarse adjustment mode

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Message-ID: <20251021160221.4021a302@kernel.org>
Date: Tue, 21 Oct 2025 16:02:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 davem@...emloft.net, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Richard
 Cochran <richardcochran@...il.com>, Russell King <linux@...linux.org.uk>,
 Köry Maincent <kory.maincent@...tlin.com>, Alexis
 Lothoré <alexis.lothore@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] net: stmmac: Allow supporting coarse
 adjustment mode

On Tue, 21 Oct 2025 10:02:01 +0200 Maxime Chevallier wrote:
> Let me know if you need more clarifications on this

The explanation was excellent, thank you. I wonder why it's designed
in such an odd way, instead of just having current_time with some
extra/fractional bits not visible in the timestamp. Sigh.

In any case, I don't feel strongly but it definitely seems to me like
the crucial distinction here is not the precision of the timestamp but
whether the user intends to dial the frequency.