linux-kernel - Re: [net-next: PATCH v3 4/6] net: mvmdio: add ACPI support

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Date:   Wed, 23 Jun 2021 23:58:14 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>, upstream@...ihalf.com,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        Jon Nettleton <jon@...id-run.com>,
        Tomasz Nowicki <tn@...ihalf.com>, rjw@...ysocki.net,
        lenb@...nel.org
Subject: Re: [net-next: PATCH v3 4/6] net: mvmdio: add ACPI support

śr., 23 cze 2021 o 22:28 Andrew Lunn <andrew@...n.ch> napisał(a):
>
> On Mon, Jun 21, 2021 at 07:30:26PM +0200, Marcin Wojtas wrote:
> > This patch introducing ACPI support for the mvmdio driver by adding
> > acpi_match_table with two entries:
> >
> > * "MRVL0100" for the SMI operation
> > * "MRVL0101" for the XSMI mode
>
> Same as the freescale MDIO bus driver, you should add
>
> depends on FWNODE_MDIO
>
> Otherwise you might find randconfig builds end up with it disabled,
> and then linker errors.
>

The CONFIG_MVMDIO is selected by CONFIG_MV643XX_ETH and actually there
is a real example of the previously discussed fallback to the
mdiobus_register() (without DT/ACPI and now FWNODE_MDIO). I just
checked and successfully built the kernel out of the dove_defconfig. I
only needed below fix, that will be submitted in v4:

--- a/include/linux/fwnode_mdio.h
+++ b/include/linux/fwnode_mdio.h
@@ -40,7 +40,7 @@ static inline int fwnode_mdiobus_register(struct mii_bus *bus,
         * This way, we don't have to keep compat bits around in drivers.
         */

-       return mdiobus_register(mdio);
+       return mdiobus_register(bus);
 }
 #endif

In order to leave dove_defconfig intact, I'd keep the current Kconfig
shape for this driver.

Thanks,
Marcin