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

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Date: Sun, 17 Dec 2023 12:15:38 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: 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: [PATCH] net: phy: marvell-88q2xxx: add driver for the Marvell
 88Q2220 PHY

Am Sun, Dec 17, 2023 at 10:22:54AM +0100 schrieb Andrew Lunn:
> > > > +	/* Set IEEE power down */
> > > > +	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, 0x840);
> > > 
> > > 0x800 is MDIO_CTRL1_LPOWER. What is the other? It seems like a speed
> > > selection bit?
> > >
> > The other is MDIO_PMA_CTRL1_SPEED1000. Will fix this in V2.
> 
> It seems odd to set a speed, and power it down. But i guess you have
> blindly copied the reference code, so have no idea why?
>
I agree, absolutely no idea. I already asked the Marvell support for
any document describing the init sequence, but they couldn't help me.
So I have to stick to the reference code. At least I copied the comments
that were part of the init sequence, trying to give some meaning to it.

> 	Andrew

	Dimitri