netdev - Re: [PATCH] enetc: auto select PHYLIB and MDIO

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Date:   Thu, 11 Feb 2021 09:38:11 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Tong Zhang <ztong0001@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] enetc: auto select PHYLIB and MDIO_DEVRES

On 2/11/21 8:09 AM, Tong Zhang wrote:
> FSL_ENETC_MDIO use symbols from PHYLIB and MDIO_DEVRES, however they are
> not auto selected.
> 
> ERROR: modpost: "__mdiobus_register" [drivers/net/ethernet/freescale/enetc/fsl-enetc-mdio.ko] undefined!
> ERROR: modpost: "mdiobus_unregister" [drivers/net/ethernet/freescale/enetc/fsl-enetc-mdio.ko] undefined!
> ERROR: modpost: "devm_mdiobus_alloc_size" [drivers/net/ethernet/freescale/enetc/fsl-enetc-mdio.ko] undefined!
> 
> auto select MDIO_DEVRES and PHYLIB when FSL_ENETC_MDIO is selected.

depends on MDIO_DEVRES && MDIO_BUS

would be more appropriate because the symbols you reference are part of
the MDIO bus layer, which happens to associated with PHYLIB depending on
the configuration but as far as build goes you can separate the two.
-- 
Florian