linux-kernel - Re: [PATCH 05/12] net: phy: add phy_id

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Date:   Wed, 5 Apr 2023 18:09:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Radu Pirea <radu-nicolae.pirea@....nxp.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Iyappan Subramanian <iyappan@...amperecomputing.com>,
        Keyur Chudgar <keyur@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 05/12] net: phy: add phy_id_broken support

> The nxp-tja11xx.c is a bit special in case of two-port devices since the
> 2nd port registers a 2nd phy device which is correct but don't have a
> dedicated compatible and so on. My 2nd idea here was to check if phy_id
> is !0 and in this case just use it. I went this way to make it a bit
> more explicit.

What is actually wrong with the current solution? It is nicely hidden
away in the driver, where workarounds for broken hardware should
be. If you have found device 1 of 2, does that not suggest its resets
are already in a good state and nothing needs to be done for the
second PHY? So just register the second PHY with the code from within
the driver.

       Andrew