linux-kernel - Re: [PATCH 1/5] net: mdio: Mask PHY only when its ACPI node is present

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Date:   Thu, 21 Apr 2022 13:40:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] net: mdio: Mask PHY only when its ACPI node is
 present

On Thu, Apr 21, 2022 at 10:58:40AM +0800, Kai-Heng Feng wrote:
> On Wed, Apr 20, 2022 at 10:47 PM Andrew Lunn <andrew@...n.ch> wrote:
> >
> > On Wed, Apr 20, 2022 at 08:40:48PM +0800, Kai-Heng Feng wrote:
> > > Not all PHY has an ACPI node, for those nodes auto probing is still
> > > needed.
> >
> > Why do you need this?
> >
> > Documentation/firmware-guide/acpi/dsd/phy.rst
> >
> > There is nothing here about there being PHYs which are not listed in
> > ACPI. If you have decided to go the ACPI route, you need to list the
> > PHYs.
> 
> This is for backward-compatibility. MAC can have ACPI node but PHY may
> not have one.

And if the PHY does not have an ACPI node, fall back to
mdiobus_register(). This is what of_mdiobus_register() does. If
np=NULL, it calls mdiobus_register() and skips all the OF stuff.

	 Andrew