linux-kernel - Re: [PATCH net-next v3 6/8] net: phy: add calibration callbacks to phy

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Message-ID: <c60c5723-0386-47cb-8135-f36c3208c302@lunn.ch>
Date:   Tue, 14 Nov 2023 20:20:19 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Romain Gantois <romain.gantois@...tlin.com>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        thomas.petazzoni@...tlin.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH net-next v3 6/8] net: phy: add calibration callbacks to
 phy_driver

On Tue, Nov 14, 2023 at 11:55:56AM +0100, Romain Gantois wrote:
> The IPQESS integrated Ethernet switch found in the IPQ4019 SoC requires
> calibration of the PHY link when its ports are brought up. This calibration
> procedure requires knowledge of precise timings and vendor-specific
> registers on both the PHY and MAC side.
> 
> The existing PHY abstraction layer does not allow coordinating this kind of
> calibration operation between MAC drivers and PHY drivers. As a
> consequence, PHY-specific calibration information has to be included in
> Ethernet drivers, since it has to schedule the entire calibration procedure
> on it's own.
> 
> Add two callbacks that extend the PHY abstraction layer to allow MAC
> drivers to start and stop PHY calibration runs in a PHY-model-independent
> manner.

When adding new APIs, you need to add an example of both sides of
it. We can then decide if the API makes sense. I don't see a PHY
driver implementing this API.


    Andrew

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pw-bot: cr