linux-kernel - Re: [PATCH v2 01/12] dt-bindings: iio: qcom: adc7-pm8350: Allow specifying SID for channels

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Date:   Mon, 31 Oct 2022 16:33:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     steev@...i.org, andersson@...nel.org, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, linux-kernel@...r.kernel.org,
        quic_jprakash@...cinc.com, krzysztof.kozlowski+dt@...aro.org,
        konrad.dybcio@...ainline.org
Subject: Re: [PATCH v2 01/12] dt-bindings: iio: qcom: adc7-pm8350: Allow
 specifying SID for channels


On Sat, 29 Oct 2022 10:44:38 +0530, Manivannan Sadhasivam wrote:
> As per the new ADC7 architecture used by the Qualcomm PMICs, each PMIC
> has the static Slave ID (SID) assigned by default. The primary PMIC
> PMK8350 is responsible for collecting the temperature/voltage data from
> the slave PMICs and exposing them via it's registers.
> 
> For getting the measurements from the slave PMICs, PMK8350 uses the
> channel ID encoded with the SID of the relevant PMIC. So far, the
> dt-binding for the slave PMIC PM8350 assumed that there will be only
> one PM8350 in a system. So it harcoded SID 1 with channel IDs.
> 
> But this got changed in platforms such as Lenovo X13s where there are a
> couple of PM8350 PMICs available. So to address multiple PM8350s, change
> the binding to accept the SID specified by the user and use it for
> encoding the channel ID.
> 
> It should be noted that, even though the SID is static it is not
> globally unique. Only the primary PMIC has the unique SID id 0.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  .../bindings/thermal/qcom-spmi-adc-tm5.yaml   |  6 +-
>  .../dt-bindings/iio/qcom,spmi-adc7-pm8350.h   | 90 +++++++++----------
>  2 files changed, 46 insertions(+), 50 deletions(-)
> 

Acked-by: Rob Herring <robh@...nel.org>