linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: rename AOSS QMP node to pmu

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Date:   Mon, 12 Dec 2022 14:46:39 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: qcom: rename AOSS QMP node to pmu

On 12/12/2022 14:38, Konrad Dybcio wrote:
> 
> 
> On 12.12.2022 14:33, Krzysztof Kozlowski wrote:
>> The Always On Subsystem (AOSS) QMP is not a power domain controller
>> since commit 135780456218 ("arm64: dts: qcom: sc7180: Use QMP property
>> to control load state") and few others.  In fact, it was never a power
>> domain controller but rather control of power state of remote
>> processors.  This power state control is know handled differently, thus
>> the AOSS QMP nodes do not have power-domain-cells:
>>
>>   sc7280-idp.dtb: power-controller@...0000: '#power-domain-cells' is a required property
>>   From schema: Documentation/devicetree/bindings/power/power-domain.yaml
>>
>> AOSS QMP is an interface to the actuall AOSS subsystem responsible for
>> some of power management functions, thus let's call the nodes as "pmu" -
>> Power Management Unit.
> power-management@ is used on apple and rockchip and pmu is very
> ambiguous (power management or performance measurement unit).

Sure, can be power-management. Samsung uses also pmu, but indeed it is
easy to confuse with PMU counters.

Best regards,
Krzysztof