linux-kernel - Re: [PATCH v3 1/2] dt-bindings: iio: adc: adding support for PAC193X

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Message-ID: <fedd4bcf-7892-4096-bcca-7ea72d39576f@linaro.org>
Date:   Thu, 16 Nov 2023 16:01:43 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     marius.cristea@...rochip.com, jic23@...nel.org, lars@...afoo.de,
        robh+dt@...nel.org, jdelvare@...e.com, linux@...ck-us.net,
        linux-hwmon@...r.kernel.org
Cc:     krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: iio: adc: adding support for PAC193X

On 15/11/2023 14:44, marius.cristea@...rochip.com wrote:
> From: Marius Cristea <marius.cristea@...rochip.com>
> 
> This is the device tree schema for iio driver for
> Microchip PAC193X series of Power Monitors with Accumulator.
> 
> Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>
> ---
>  .../bindings/iio/adc/microchip,pac1934.yaml   | 137 ++++++++++++++++++
>  1 file changed, 137 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> new file mode 100644
> index 000000000000..2609cb19c377
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> @@ -0,0 +1,137 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/microchip,pac1934.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PAC1934 Power Monitors with Accumulator
> +
> +maintainers:
> +  - Marius Cristea <marius.cristea@...rochip.com>
> +
> +description: |
> +  This device is part of the Microchip family of Power Monitors with Accumulator.
> +  The datasheet for PAC1931, PAC1932, PAC1933 and PAC1934 can be found here:
> +    https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/PAC1931-Family-Data-Sheet-DS20005850E.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,pac1931
> +      - microchip,pac1932
> +      - microchip,pac1933
> +      - microchip,pac1934
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  microchip,slow-io:
> +    type: boolean
> +    description: |
> +      A GPIO used to trigger a change is sampling rate (lowering the chip power consumption).

Use Linux coding style wrapping (as described in Linux Coding style). I
am not going to tell you numbers because I want you to read the document
first.

This is boolean, not GPIO. I don't understand. "A GPIO", so any GPIO or
some specific? How is this property related to GPIO?


> +      If configured in SLOW mode, if this pin is forced high, sampling rate is forced to eight

This pin? This is boolean, not a GPIO. GPIOs are phandles.

> +      samples/second. When it is forced low, the sampling rate is 1024 samples/second unless
> +      a different sample rate has been programmed.
> +
> +patternProperties:
> +  "^channel@[1-4]+$":
> +    type: object
> +    $ref: adc.yaml
> +    description: Represents the external channels which are connected to the ADC.
> +
> +    properties:
> +      reg:
> +        items:
> +          minimum: 1
> +          maximum: 4
> +
> +      shunt-resistor-micro-ohms:
> +        description: |
> +          Value in micro Ohms of the shunt resistor connected between
> +          the SENSE+ and SENSE- inputs, across which the current is measured. Value
> +          is needed to compute the scaling of the measured current.
> +
> +    required:
> +      - reg
> +      - shunt-resistor-micro-ohms
> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: interrupts


I don't understand what do you want to say here. I am also 100% sure you
did not test it on a real case (maybe example passes but nothing more).

> +    then:
> +      properties:
> +        microchip,slow-io: false
> +    else:
> +      if:
> +        properties:
> +          compatible:
> +            contains:
> +              const: microchip,slow-io
> +      then:
> +        properties:
> +          interrupts: false

Best regards,
Krzysztof