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Date: Sun, 17 Dec 2023 12:15:38 +0100
From: Dimitri Fedrau <dima.fedrau@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Stefan Eichenberger <eichest@gmail.com>, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: phy: marvell-88q2xxx: add driver for the Marvell
 88Q2220 PHY
Message-ID: <20231217111538.GA3591@debian>
References: <20231215213102.35994-1-dima.fedrau@gmail.com>
 <74d4b8f9-700e-45bc-af59-95a40a777b00@lunn.ch>
 <20231216221151.GA143483@debian>
 <28cc73bf-ed6d-49d8-b80b-4fbf5fa0442f@lunn.ch>
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In-Reply-To: <28cc73bf-ed6d-49d8-b80b-4fbf5fa0442f@lunn.ch>

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