linux-kernel - Re: [PATCH 01/11] dt-bindings: iio: qcom: adc7-pm8350: Allow specifying SID for channels

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Date:   Thu, 27 Oct 2022 09:46:58 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org
Cc:     konrad.dybcio@...ainline.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        quic_jprakash@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] dt-bindings: iio: qcom: adc7-pm8350: Allow
 specifying SID for channels

On 27/10/2022 02:29, 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(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml b/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml
> index feb390d50696..d20569b9b763 100644
> --- a/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml
> +++ b/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml
> @@ -222,8 +222,8 @@ examples:
>                  qcom,hw-settle-time = <200>;
>              };
>  
> -            conn-therm@47 {
> -                reg = <PM8350_ADC7_AMUX_THM4_100K_PU>;
> +            conn-therm@147 {
> +                reg = <PM8350_ADC7_AMUX_THM4_100K_PU(1)>;
>                  qcom,ratiometric;
>                  qcom,hw-settle-time = <200>;
>              };
> @@ -247,7 +247,7 @@ examples:
>  
>              conn-therm@1 {
>                  reg = <1>;
> -                io-channels = <&pmk8350_vadc PM8350_ADC7_AMUX_THM4_100K_PU>;
> +                io-channels = <&pmk8350_vadc PM8350_ADC7_AMUX_THM4_100K_PU(1)>;
>                  qcom,avg-samples = <2>;
>                  qcom,ratiometric;
>                  qcom,hw-settle-time-us = <200>;
> diff --git a/include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h b/include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h
> index 9426f27a1946..50de5adfe6ac 100644
> --- a/include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h
> +++ b/include/dt-bindings/iio/qcom,spmi-adc7-pm8350.h
> @@ -6,62 +6,58 @@
>  #ifndef _DT_BINDINGS_QCOM_SPMI_VADC_PM8350_H
>  #define _DT_BINDINGS_QCOM_SPMI_VADC_PM8350_H
>  
> -#ifndef PM8350_SID
> -#define PM8350_SID					1
> -#endif
> -
>  /* ADC channels for PM8350_ADC for PMIC7 */
> -#define PM8350_ADC7_REF_GND			(PM8350_SID << 8 | 0x0)
> -#define PM8350_ADC7_1P25VREF			(PM8350_SID << 8 | 0x01)
> -#define PM8350_ADC7_VREF_VADC			(PM8350_SID << 8 | 0x02)
> -#define PM8350_ADC7_DIE_TEMP			(PM8350_SID << 8 | 0x03)
> -
> -#define PM8350_ADC7_AMUX_THM1			(PM8350_SID << 8 | 0x04)
> -#define PM8350_ADC7_AMUX_THM2			(PM8350_SID << 8 | 0x05)
> -#define PM8350_ADC7_AMUX_THM3			(PM8350_SID << 8 | 0x06)
> -#define PM8350_ADC7_AMUX_THM4			(PM8350_SID << 8 | 0x07)
> -#define PM8350_ADC7_AMUX_THM5			(PM8350_SID << 8 | 0x08)
> -#define PM8350_ADC7_GPIO1			(PM8350_SID << 8 | 0x0a)
> -#define PM8350_ADC7_GPIO2			(PM8350_SID << 8 | 0x0b)
> -#define PM8350_ADC7_GPIO3			(PM8350_SID << 8 | 0x0c)
> -#define PM8350_ADC7_GPIO4			(PM8350_SID << 8 | 0x0d)
> +#define PM8350_ADC7_REF_GND(sid)			(sid << 8 | 0x0)

As it is macro, I think it argument should be in parens: (sid)


Best regards,
Krzysztof