linux-kernel - Re: [PATCH V1 2/4] dt-bindings: soc: qcom,mpm-sleep-counter: Add the dtschema

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Message-ID: <859ec5d4-4cb6-1d8a-33b6-91df071e07a1@linaro.org>
Date:   Wed, 22 Mar 2023 17:29:51 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH V1 2/4] dt-bindings: soc: qcom,mpm-sleep-counter: Add the
 dtschema

On 22/03/2023 14:46, Souradeep Chowdhury wrote:
>>> +      - const: qcom,mpm2-sleep-counter
>>
>> SoC specific compatible.
>>
> 
> This is a generic Module Power Manager Sleep Counter which is present in 
> all Qcom Socs, so SoC specific compatible is not given here.

Not really a good reason and it is actually very difficult to verify
this. If I understand correctly any moment FW can change and this will
stop being valid, so no.

> 
>>> +
>>> +  reg:
>>> +    items:
>>> +      - description: MPM Sleep Counter Base
>>
>> just maxItems: 1
>>
> 
> Ack
>>> +
>>> +  clock-frequency:
>>> +    description: Frequency for the sleep counter
>>
>> Since this does not have clocks, what frequency you are setting here?
> 
> Module Power Manager(MPM) Sleep Counter is a clock that starts ticking 
> from Primary Boot Loader(PBL) Stage. This is usually a 32 Khz clock and 
> the frequency for the same is stored here.

You just said all devices have the same MPM, so I would argue that all
devices have the same clock.

Anyway, this is a legacy property.

Best regards,
Krzysztof