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

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Message-ID: <CAAd53p5Wwn+HOMm1Z0VWcR_WrTzRvAGZOYg4X_txugSFd+EsDQ@mail.gmail.com>
Date:   Thu, 21 Apr 2022 10:58:40 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Andrew Lunn <andrew@...n.ch>
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 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.

On ACPI based platform, stmmac is using mdiobus_register() and its PHY
is using autoprobing, so masking all PHYs from autoprobing will break
those stmmac users.

Kai-Heng

>
>         Andrew