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

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Message-ID: <2653e293-92a1-817f-6a84-c8e21f34d304@linaro.org>
Date:   Wed, 28 Dec 2022 12:11:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     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, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        dianders@...omium.org, Johan Hovold <johan+kernel@...nel.org>
Subject: Re: [PATCH v3] regulator: dt-bindings: qcom,rpmh: Indicate
 regulator-allow-set-load dependencies

On 28/12/2022 11:58, Johan Hovold wrote:
> On Wed, Dec 28, 2022 at 11:37:06AM +0100, Krzysztof Kozlowski wrote:
>> 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?
> 
> Didn't Doug already do that?
> 
> 	https://lore.kernel.org/all/20220829164952.2672848-1-dianders@chromium.org/

You're right, thanks. I keep seeing the error on
sm8350-sony-xperia-sagami-pdx214 and I thought it is on every board. My
bad. I'll fix the Xperia same way as HDK was fixed.


Best regards,
Krzysztof