linux-kernel - Re: Re: [PATCH v6 net-next 05/14] net: phy: marvell-88q2xxx: add driver for the Marvell 88Q2220 PHY

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Date: Fri, 16 Feb 2024 21:53:02 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Gregor Herburger <gregor.herburger@...tq-group.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>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v6 net-next 05/14] net: phy: marvell-88q2xxx: add
 driver for the Marvell 88Q2220 PHY

Am Fri, Feb 16, 2024 at 10:18:10AM +0100 schrieb Gregor Herburger:
> On Thu, Feb 15, 2024 at 09:24:03PM +0100, Dimitri Fedrau wrote:
> > > Hi Dimitri,
> > >
> > Hi Gregor,
> > 
> > > On Tue, Feb 13, 2024 at 10:39:44PM +0100, Dimitri Fedrau wrote:
> > > >  static struct phy_driver mv88q2xxx_driver[] = {
> > > >  	{
> > > >  		.phy_id			= MARVELL_PHY_ID_88Q2110,
> > > > @@ -255,12 +439,26 @@ static struct phy_driver mv88q2xxx_driver[] = {
> > > >  		.get_sqi		= mv88q2xxx_get_sqi,
> > > >  		.get_sqi_max		= mv88q2xxx_get_sqi_max,
> > > >  	},
> > > > +	{
> > > > +		PHY_ID_MATCH_EXACT(PHY_ID_88Q2220_REVB0),
> > > 
> > > I tested the series on a 88Q2220 REV B1 (which is id 0x002b0b22). The
> > > driver works fine on this revision.
> > > 
> > > I understand that in the Marvell API the initialization for Rev B0 and
> > > B1 differ. For B0 some additional init sequence is executed. I did not look
> > > into the details of this sequence. However this patch seems to work on
> > > Rev B1.
> > >
> > > Would you consider adding compatibility for Rev B1 and following? I
> > > tested with:
> > > 		.phy_id			= MARVELL_PHY_ID_88Q2220,
> > > 		.phy_id_mask		= MARVELL_PHY_ID_MASK,
> > >
> > 
> > thanks for testing. I would stick to the exact initialization sequence
> > provided by the Marvell API. Registers and bits are mostly undocumented
> > and I think it is safest this way. Besides that it should be relatively
> > easy to add the support for rev. B1 by just adding the init sequence for
> > it.
> 
> Ok. I will have an closer look at the marvell API and eventually come up
> with a patch for Rev. B1.
> 
> There is also a Rev.B2 for which I cannot find any init sequence. But
> Rev. B1 will no longer be produced so I need a solution for B2
> eventually.
>
After having a quick glance at the latest Marvell API release, the init
sequences for B1 and B2 are almost the same. It differs by a single
register write. Would be great if you can come up with a patch.

Dimitri