linux-kernel - Re: [PATCH 2/2] dt-bindings: iio: adc: nxp,imx93-adc.yaml: Add calibration properties

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Date: Wed, 20 Mar 2024 13:05:29 +0100
From: Andrej Picej <andrej.picej@...ik.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, haibo.chen@....com,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org
Cc: jic23@...nel.org, lars@...afoo.de, shawnguo@...nel.org,
 s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 upstream@...ts.phytec.de
Subject: Re: [PATCH 2/2] dt-bindings: iio: adc: nxp,imx93-adc.yaml: Add
 calibration properties

Hi Krzysztof,

On 20. 03. 24 11:26, Krzysztof Kozlowski wrote:
> On 20/03/2024 11:04, Andrej Picej wrote:
>> Document calibration properties and how to set them.
> 
> Bindings are before users.

will change patch order when I send a v2.

> 
> Please use subject prefixes matching the subsystem. You can get them for
> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
> your patch is touching.
> There is no file extension in prefixes.

So: dt-bindings: iio/adc: nxp,imx93-adc: Add calibration properties?

> 
>>
>> Signed-off-by: Andrej Picej <andrej.picej@...ik.com>
>> ---
>>   .../bindings/iio/adc/nxp,imx93-adc.yaml           | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/nxp,imx93-adc.yaml b/Documentation/devicetree/bindings/iio/adc/nxp,imx93-adc.yaml
>> index dacc526dc695..64958be62a6a 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/nxp,imx93-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/nxp,imx93-adc.yaml
>> @@ -46,6 +46,21 @@ properties:
>>     "#io-channel-cells":
>>       const: 1
>>   
>> +  nxp,calib-avg-en:
>> +    description:
>> +      Enable or disable averaging of calibration time.
>> +    enum: [ 0, 1 ]
>> +
>> +  nxp,calib-nr-samples:
>> +    description:
>> +      Selects the number of averaging samples to be used during calibration.
>> +    enum: [ 16, 32, 128, 512 ]
>> +
>> +  nxp,calib-t-samples:
>> +    description:
>> +      Specifies the sample time of calibration conversions.
>> +    enum: [ 8, 16, 22, 32 ]
> 
> No, use existing, generic properties. Open other bindings for this.

You mean I should use generic properties for the ADC calibration 
settings? Is there already something in place? Because as I understand 
it, these calib-* values only effect the calibration process of the ADC.

> 
> Also, none of these were tested. I am not going to review such untested
> code.
> 
> It does not look like you tested the bindings, at least after quick
> look. Please run `make dt_binding_check` (see
> Documentation/devicetree/bindings/writing-schema.rst for instructions).
> Maybe you need to update your dtschema and yamllint.

You are right, I did not run the dt_binding_check, sorry for this, 
forgot that this existed. I see now I have to add the:
> $ref: /schemas/types.yaml#/definitions/uint32

Will fix in v2.

BR,
Andrej

> 
> Best regards,
> Krzysztof
>