linux-kernel - Re: [net-next: PATCH 08/12] ACPI: scan: prevent double enumeration of MDIO bus children

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Message-ID: <YrC0BSeUJaBkhEop@smile.fi.intel.com>
Date:   Mon, 20 Jun 2022 20:53:09 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org, rafael@...nel.org, lenb@...nel.org,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk,
        hkallweit1@...il.com, gjb@...ihalf.com, jaz@...ihalf.com,
        tn@...ihalf.com, Samer.El-Haj-Mahmoud@....com,
        upstream@...ihalf.com
Subject: Re: [net-next: PATCH 08/12] ACPI: scan: prevent double enumeration
 of MDIO bus children

On Mon, Jun 20, 2022 at 05:02:21PM +0200, Marcin Wojtas wrote:
> The MDIO bus is responsible for probing and registering its respective
> children, such as PHYs or other kind of devices.
> 
> It is required that ACPI scan code should not enumerate such
> devices, leaving this task for the generic MDIO bus routines,
> which are initiated by the controller driver.
> 
> This patch prevents unwanted enumeration of the devices by setting
> 'enumeration_by_parent' flag, depending on whether their parent
> device is a member of a known list of MDIO controllers. For now,
> the Marvell MDIO controllers' IDs are added.

This flag is used for serial buses that are not self-discoverable. Not sure
about MDIO, but the current usage has a relation to the _CRS. Have you
considered to propose the MdioSerialBus() resource type to ACPI specification?

-- 
With Best Regards,
Andy Shevchenko