linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: pressure: Support Honeywell mpr sensors

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Message-ID: <27a1d0f4-3a02-c7fd-36a0-07729a136e20@linaro.org>
Date:   Sat, 1 Apr 2023 11:42:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andreas Klinger <ak@...klinger.de>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Angel Iglesias <ang.iglesiasg@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: iio: pressure: Support Honeywell mpr
 sensors

On 01/04/2023 11:09, Andreas Klinger wrote:
> Honeywell mpr is a pressure sensor family. There are many different
> types with different pressure ranges. The range needs to be set up in
> the dt. Therefore new properties honeywell,pmin and honeywell,pmax are
> introduced.
> 
> Add dt-bindings.
> 
> Signed-off-by: Andreas Klinger <ak@...klinger.de>
> ---
>  .../bindings/iio/pressure/honeywell,mpr.yaml  | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/pressure/honeywell,mpr.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/pressure/honeywell,mpr.yaml b/Documentation/devicetree/bindings/iio/pressure/honeywell,mpr.yaml
> new file mode 100644
> index 000000000000..d6fad6f841cf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/pressure/honeywell,mpr.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/pressure/honeywell,mpr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Honeywell mpr pressure sensor
> +
> +maintainers:
> +  - Andreas Klinger <ak@...klinger.de>
> +
> +description: |
> +  Honeywell pressure sensor of type mpr. This sensor has an I2C and SPI interface. Only the I2C

Doesn't look wrapped according to Linux coding style (see Coding style).

> +  interface is implemented.
> +
> +  There are many subtypes with different pressure ranges available. Therefore the minimum and
> +  maximum pressure values of the specific sensor needs to be specified in Pascal.
> +
> +  Specifications about the devices can be found at:
> +    https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/  \
> +      pressure-sensors/board-mount-pressure-sensors/micropressure-mpr-series/documents/          \
> +      sps-siot-mpr-series-datasheet-32332628-ciid-172626.pdf

Lines are not continued, so drop \

> +
> +properties:
> +  compatible:
> +    const: honeywell,mpr

You need device specific compatible, not some generic one. Rename also
then the filename (should match the compatible).

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    description:
> +      Optional GPIO for resetting the device. If not present the device is not resetted.

Are you sure it is wrapped properly?

> +    maxItems: 1
> +
> +  honeywell,pmin:
> +    description:
> +      Minimum pressure value the sensor can measure in pascal.

Use standard unit suffix:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  honeywell,pmax:
> +    description:
> +      Maximum pressure value the sensor can measure in pascal.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Same.

Why these values are suitable for DT? Does it depend on type of sensor
(thus it is implied from compatible) or on system setup?

> +
> +required:
> +  - compatible
> +  - reg
> +  - honeywell,pmin
> +  - honeywell,pmax
> +


Best regards,
Krzysztof