linux-kernel - Re: [PATCH v2 02/10] dt-bindings: iio: pressure: honeywell,mprls0025pa.yaml add pressure-triplet

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Message-ID: <49525adf-1540-4801-8cdf-be1c0fe640f6@linaro.org>
Date: Mon, 25 Dec 2023 13:57:39 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Petre Rodan <petre.rodan@...dimension.ro>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Andreas Klinger <ak@...klinger.de>, Jonathan Cameron <jic23@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v2 02/10] dt-bindings: iio: pressure:
 honeywell,mprls0025pa.yaml add pressure-triplet

On 24/12/2023 15:34, Petre Rodan wrote:
> Change order of properties in order for the end user to de-prioritize
> pmin-pascal and pmax-pascal which are superseded by pressure-triplet.
> 
> Add pressure-triplet property which automatically initializes
> pmin-pascal and pmax-pascal inside the driver
> 
> Rework honeywell,pmXX-pascal requirements based on feedback from
> Jonathan and Conor.
> 
> Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
> Signed-off-by: Andreas Klinger <ak@...klinger.de>
> ---
>  .../iio/pressure/honeywell,mprls0025pa.yaml   | 64 ++++++++++++++-----
>  1 file changed, 47 insertions(+), 17 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml b/Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml
> index 84ced4e5a7da..e4021306d187 100644
> --- a/Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml
> +++ b/Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml
> @@ -19,14 +19,17 @@ description: |
>    calls them "mpr series". All of them have the identical programming model and
>    differ in the pressure range, unit and transfer function.
> 
> -  To support different models one need to specify the pressure range as well as
> -  the transfer function. Pressure range needs to be converted from its unit to
> +  To support different models one need to specify its pressure triplet as well
> +  as the transfer function.
> +
> +  For custom models the pressure values can alternatively be specified manually.
> +  The minimal range value stands for the minimum pressure and the maximum value
> +  also for the maximum pressure with linear relation inside the range.
> +  Pressure range needs to be converted from the datasheet specified unit to
>    pascal.
> 
>    The transfer function defines the ranges of numerical values delivered by the
> -  sensor. The minimal range value stands for the minimum pressure and the
> -  maximum value also for the maximum pressure with linear relation inside the
> -  range.
> +  sensor.
> 
>    Specifications about the devices can be found at:
>      https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/
> @@ -54,14 +57,6 @@ properties:
>        If not present the device is not reset during the probe.
>      maxItems: 1
> 
> -  honeywell,pmin-pascal:
> -    description:
> -      Minimum pressure value the sensor can measure in pascal.
> -
> -  honeywell,pmax-pascal:
> -    description:
> -      Maximum pressure value the sensor can measure in pascal.
> -
>    honeywell,transfer-function:
>      description: |
>        Transfer function which defines the range of valid values delivered by the
> @@ -72,17 +67,52 @@ properties:
>      enum: [1, 2, 3]
>      $ref: /schemas/types.yaml#/definitions/uint32
> 
> +  honeywell,pressure-triplet:

Why not putting it just before existing properties?

> +    description: |
> +      Case-sensitive five character string that defines pressure range, unit
> +      and type as part of the device nomenclature. In the unlikely case of a
> +      custom chip, unset and provide pmin-pascal and pmax-pascal instead.
> +    enum: [0001BA, 01.6BA, 02.5BA, 0060MG, 0100MG, 0160MG, 0250MG, 0400MG,
> +           0600MG, 0001BG, 01.6BG, 02.5BG, 0100KA, 0160KA, 0250KA, 0006KG,
> +           0010KG, 0016KG, 0025KG, 0040KG, 0060KG, 0100KG, 0160KG, 0250KG,
> +           0015PA, 0025PA, 0030PA, 0001PG, 0005PG, 0015PG, 0030PG, 0300YG]
> +    $ref: /schemas/types.yaml#/definitions/string
> +
> +  honeywell,pmin-pascal:
> +    description:
> +      Minimum pressure value the sensor can measure in pascal.
> +      To be specified only if honeywell,pressure-triplet is not set.

The last sentence is redundant - schema should enforce that.

> +
> +  honeywell,pmax-pascal:
> +    description:
> +      Maximum pressure value the sensor can measure in pascal.
> +      To be specified only if honeywell,pressure-triplet is not set.
> +
>    vdd-supply:
>      description: provide VDD power to the sensor.
> 
>  required:
>    - compatible
>    - reg
> -  - honeywell,pmin-pascal
> -  - honeywell,pmax-pascal
>    - honeywell,transfer-function
>    - vdd-supply
> 
> +oneOf:
> +  - required:
> +      - honeywell,pmin-pascal
> +      - honeywell,pmax-pascal
> +  - required:
> +      - honeywell,pressure-triplet
> +
> +allOf:
> +  - if:
> +      required:
> +        - honeywell,pressure-triplet
> +    then:
> +      properties:
> +        honeywell,pmin-pascal: false
> +        honeywell,pmax-pascal: false

This allOf is not needed.

Best regards,
Krzysztof