linux-kernel - Re: [PATCH net V2 1/1] net: phy: fix invalid phy id when probe using C22

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Message-ID: <20210319085628.GT1463@shell.armlinux.org.uk>
Date:   Fri, 19 Mar 2021 08:56:28 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Wong Vee Khee <vee.khee.wong@...el.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Calvin Johnson <calvin.johnson@....nxp.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Voon Weifeng <weifeng.voon@...el.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>
Subject: Re: [PATCH net V2 1/1] net: phy: fix invalid phy id when probe using
 C22

On Fri, Mar 19, 2021 at 08:40:45AM +0100, Heiner Kallweit wrote:
> Is there a specific reason why c22 is probed first? Reversing the order
> would solve the issue we speak about here.
> c45-probing of c22-only PHY's shouldn't return false positives
> (at least at a first glance).

That would likely cause problems for the I2f MDIO driver, since a
C45 read is indistinguishable from a C22 write on the I2C bus.

-- 
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