netdev - Re: [PATCH] net: phy: marvell-88q2xxx: add driver for the Marvell 88Q2220 PHY

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Date: Tue, 19 Dec 2023 10:19:41 +0100
From: Stefan Eichenberger <eichest@...il.com>
To: Dimitri Fedrau <dima.fedrau@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: marvell-88q2xxx: add driver for the Marvell
 88Q2220 PHY

On Tue, Dec 19, 2023 at 09:11:17AM +0100, Dimitri Fedrau wrote:

> I could add the init sequence for the 88Q2221 PHY. Then you could test
> it on your side. Would this be helpful to you ? Did you already have the
> chance to test the patch ?

Unfortunately I haven't had time to test it yet. I will try to do it on
Thursday, otherwise sadly it will be next year.

> You are right, but I would propose to stick to the reference init
> sequence and make sure the PHYs works with our code and then work on
> optimizing the code. We still can remove and/or document parts of it.

I am not sure that it will be accepted by the maintainers if you use a
lot of registers that are not documented. For this reason, keeping it to
a minimum might increase the chances of it being accepted.

> Are you trying with the patch I provided or your own code ? If you use
> my patch you should wait until V3, because I found some problems with
> it. Switching from 1000Mbit/s to 100Mbit/s in autonegotiation mode doesn't
> work. I could fix it but the fix touches some code already upstreamed. So
> I tried to push parts of it yesterday. I forgot to cc you, just used the
> get_maintainer script. I will add you to the cc list. Until then you can
> look it up here: 20231218221814.69304-2-dima.fedrau@...il.com

I used my own code so far but I will try again with your patches. Maybe
send this and the other patches as a whole series so that it gets clear
why you need the changes as Andrew wrote.

Regards,
Stefan