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Message-ID: <60787e41-e137-43d7-8fd0-59818cfbb536@gmail.com>
Date:   Tue, 17 Oct 2023 09:37:38 -0700
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Subject: Re: [PATCH v2 net] net: mdio-mux: fix C45 access returning -EIO after
 API change
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To:     Vladimir Oltean <vladimir.oltean@nxp.com>, netdev@vger.kernel.org
Cc:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
        Michael Walle <michael@walle.cc>, linux-kernel@vger.kernel.org
References: <20231017143144.3212657-1-vladimir.oltean@nxp.com>
From:   Florian Fainelli <f.fainelli@gmail.com>
In-Reply-To: <20231017143144.3212657-1-vladimir.oltean@nxp.com>
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On 10/17/23 07:31, Vladimir Oltean wrote:
> The mii_bus API conversion to read_c45() and write_c45() did not cover
> the mdio-mux driver before read() and write() were made C22-only.
> 
> This broke arch/arm64/boot/dts/freescale/fsl-ls1028a-qds-13bb.dtso.
> The -EOPNOTSUPP from mdiobus_c45_read() is transformed by
> get_phy_c45_devs_in_pkg() into -EIO, is further propagated to
> of_mdiobus_register() and this makes the mdio-mux driver fail to probe
> the entire child buses, not just the PHYs that cause access errors.
> 
> Fix the regression by introducing special c45 read and write accessors
> to mdio-mux which forward the operation to the parent MDIO bus.
> 
> Fixes: db1a63aed89c ("net: phy: Remove fallback to old C45 method")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
-- 
Florian