netdev - Re: [PATCH v2] net: stmmac: correct MAC propagation delay

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Message-ID: <f7849436-8dac-64b1-8ec6-3aced13bee94@pengutronix.de>
Date: Thu, 27 Jul 2023 08:40:51 +0200
From: Johannes Zink <j.zink@...gutronix.de>
To: Richard Cochran <richardcochran@...il.com>,
 Marc Kleine-Budde <mkl@...gutronix.de>
Cc: kernel test robot <lkp@...el.com>, "David S. Miller"
 <davem@...emloft.net>, Russell King <linux@...linux.org.uk>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Eric Dumazet <edumazet@...gle.com>, Jose Abreu <joabreu@...opsys.com>,
 linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
 Giuseppe Cavallaro <peppe.cavallaro@...com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-stm32@...md-mailman.stormreply.com,
 Maxime Coquelin <mcoquelin.stm32@...il.com>, patchwork-jzi@...gutronix.de
Subject: Re: [PATCH v2] net: stmmac: correct MAC propagation delay

Hi Richard,

On 7/26/23 17:34, Richard Cochran wrote:
> On Wed, Jul 26, 2023 at 08:04:37AM +0200, Marc Kleine-Budde wrote:
> 
>> At least the datasheet of the IP core tells to read the MAC delay from
>> the IP core (1), add the PHY delay (2) and the clock domain crossing
>> delay (3) and write it to the time stamp correction register.
> 
> That is great, until they change the data sheet.  Really, this happens.

I think I don't get your point here.

That's true for literally any register of any peripheral in a datasheet.
I think we can just stop doing driver development if we wait for a final
revision that is not changed any more. Datasheets change, and if they do we
update the driver.

Johannes

> 
> Thanks,
> Richard
> 
> 

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