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

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Date: Sun, 17 Dec 2023 10:22:54 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Dimitri Fedrau <dima.fedrau@...il.com>
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

> > > +	/* 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?

	Andrew