linux-kernel - Re: [PATCH v4 2/2] dt-bindings: hwmon: Add sample averaging properties for ADM1275

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Date:   Tue, 1 Mar 2022 20:42:39 +0800
From:   POTIN LAI <potin.lai@...ntatw.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Patrick Williams <patrick@...cx.xyz>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: hwmon: Add sample averaging
 properties for ADM1275


Krzysztof Kozlowski 於 1/03/2022 7:16 pm 寫道:
> On 01/03/2022 11:39, Potin Lai wrote:
>> Add documentation of new properties for sample averaging in PMON_CONFIG
>> register.
>>
>> New properties:
>> - adi,volt-curr-sample-average
>> - adi,power-sample-average
>> - adi,power-sample-average-enable
>>
>> Signed-off-by: Potin Lai <potin.lai@...ntatw.com>
>> ---
>>  .../bindings/hwmon/adi,adm1275.yaml           | 44 +++++++++++++++++++
>>  1 file changed, 44 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/adi,adm1275.yaml b/Documentation/devicetree/bindings/hwmon/adi,adm1275.yaml
>> index 223393d7cafd..1b612dc06992 100644
>> --- a/Documentation/devicetree/bindings/hwmon/adi,adm1275.yaml
>> +++ b/Documentation/devicetree/bindings/hwmon/adi,adm1275.yaml
>> @@ -37,6 +37,47 @@ properties:
>>      description:
>>        Shunt resistor value in micro-Ohm.
>>  
>> +  adi,volt-curr-sample-average:
>> +    description: |
>> +      Number of samples to be used to report voltage and current values.
>> +      If the configured value is not a power of 2, sample averaging number
>> +      will be configured with smaller and closest power of 2.
>> +
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [1, 2, 4, 8, 16, 32, 64, 128]
>> +    default: 1
>> +
>> +  adi,power-sample-average:
>> +    description: |
>> +      Number of samples to be used to report power values.
>> +      If the configured value is not a power of 2, sample averaging number
>> +      will be configured with smaller and closest power of 2.
>> +
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [1, 2, 4, 8, 16, 32, 64, 128]
>> +    default: 1
>> +
>> +  adi,power-sample-average-enable:
>> +    description: Enable sample averaging for power reading.
>> +    type: boolean
> Why do you need this property? Voltage/current sampling is enabled in
> your driver with presence of adi,volt-curr-sample-average. Why power
> sampling is different?
For "adi,power-sample-average", adm1075, adm1275 & adm127 don't have config reg for power sample average, so I add boolean type property to enable it
But for "adi,power-sample-average-enable", all chips have ability of configuring, so it doesn't need a property to enable or disable.


Does example means that I can set any type (not just boolean?) of property to false if not allowed?
Could I write as below?

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - chips_not_support
    then:
      properties:
        adi,power-sample-average: false

Sorry, I am not quite understand the example of set property not allowed, if I still get it wrong, please advise more detailed, thank you.


Potin
>
> Best regards,
> Krzysztof