linux-kernel - Re: [PATCH v3] regulator: dt-bindings: qcom,rpmh: Indicate regulator-allow-set-load dependencies

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Message-ID: <14b0237d-6511-4a1f-3bda-e0e72b442a56@linaro.org>
Date:   Wed, 28 Dec 2022 11:37:06 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andrew Halaney <ahalaney@...hat.com>, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...ainline.org,
        lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dianders@...omium.org,
        johan@...nel.org, Johan Hovold <johan+kernel@...nel.org>
Subject: Re: [PATCH v3] regulator: dt-bindings: qcom,rpmh: Indicate
 regulator-allow-set-load dependencies

On 07/09/2022 22:49, Andrew Halaney wrote:
> For RPMH regulators it doesn't make sense to indicate
> regulator-allow-set-load without saying what modes you can switch to,
> so be sure to indicate a dependency on regulator-allowed-modes.
> 
> In general this is true for any regulators that are setting modes
> instead of setting a load directly, for example RPMH regulators. A
> counter example would be RPM based regulators, which set a load
> change directly instead of a mode change. In the RPM case
> regulator-allow-set-load alone is sufficient to describe the regulator
> (the regulator can change its output current, here's the new load),
> but in the RPMH case what valid operating modes exist must also be
> stated to properly describe the regulator (the new load is this, what
> is the optimum mode for this regulator with that load, let's change to
> that mode now).
> 
> With this in place devicetree validation can catch issues like this:
> 
>     /mnt/extrassd/git/linux-next/arch/arm64/boot/dts/qcom/sm8350-hdk.dtb: pm8350-rpmh-regulators: ldo5: 'regulator-allowed-modes' is a dependency of 'regulator-allow-set-load'
>             From schema: /mnt/extrassd/git/linux-next/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml

Andrew,

This patch was merged therefore we started seeing such warnings. Any
plans to actually fix them?

Best regards,
Krzysztof