linux-kernel - Re: [PATCH 8/9] net: mdio: ipq4019: add qca8084 configurations

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Date:   Thu, 16 Nov 2023 18:08:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jie Luo <quic_luoj@...cinc.com>
Cc:     Robert Marko <robert.marko@...tura.hr>,
        Konrad Dybcio <konrad.dybcio@...aro.org>, agross@...nel.org,
        andersson@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        hkallweit1@...il.com, linux@...linux.org.uk,
        linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_srichara@...cinc.com
Subject: Re: [PATCH 8/9] net: mdio: ipq4019: add qca8084 configurations

> Yes, the clock driver of qca8084 is probed as the MDIO device, the
> configuration sequence here to lighten the qca8084 PHY need to
> be completed before the clock APIs available to call.

Please cleanly separate clock from MDIO. The MDIO driver should only
use the common clock framework API calls. If the clock driver is not
loaded yet, trying to get a clock should return -EPROBE_DEFER. The
MDIO driver should return that from its probe function. The driver
core will then try to probe the MDIO driver later, by which time the
clock driver should of loaded.

      Andrew