linux-kernel - Re: [PATCH] net: mdio: force deassert MDIO reset signal

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Message-ID: <Y8al5zE5zwu0CET5@lunn.ch>
Date:   Tue, 17 Jan 2023 14:43:03 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Pierluigi Passaro <pierluigi.p@...iscite.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Pierluigi Passaro <pierluigi.passaro@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eran Matityahu <eran.m@...iscite.com>,
        Nate Drude <Nate.D@...iscite.com>,
        Francesco Ferraro <francesco.f@...iscite.com>
Subject: Re: [PATCH] net: mdio: force deassert MDIO reset signal

On Mon, Jan 16, 2023 at 08:39:31AM +0000, Pierluigi Passaro wrote:
> On Mon, Jan 16, 2023 at 12:55 AM Andrew Lunn <andrew@...n.ch> wrote:
> > > Specifying the ID as part of the compatible string works for clause 22 PHYs,
> > > but for clause 45 PHYs it does not work. The code always wants to read the
> > > ID from the PHY itself. But I do not understand things well enough to tell
> > > whether that's a fundamental restriction of C45 or just our implementation
> > > and the implementation can be changed to fix it.
> > >
> > > Do you have some thoughts on this?
> >
> > Do you have more details about what goes wrong? Which PHY driver is
> > it? What compatibles do you put into DT for the PHY?
> >
> We use both AR8033 and ADIN1300: these are 10/100/1000 PHYs.
> They are both probed after the MDIO bus, but skipped if the reset was
> asserted while probing the MDIO bus.
> However, for iMX6UL and iMX7 we use C22, not C45.

I never said it did. Please read the actual emails, then you would of
noticed we have go off on tangent and are trying to fix another issue.

	Andrew