linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: adc: adding dt-bindings for PAC193X

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Date:   Fri, 27 Oct 2023 14:13:30 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     marius.cristea@...rochip.com, jic23@...nel.org, lars@...afoo.de,
        robh+dt@...nel.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 v2 1/2] dt-bindings: iio: adc: adding dt-bindings for
 PAC193X

A nit, subject: drop second/last, redundant "bindings". The
"dt-bindings" prefix is already stating that these are bindings.
On 25/10/2023 15:44, 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   | 146 ++++++++++++++++++
>  1 file changed, 146 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..837053ed8a71
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> @@ -0,0 +1,146 @@
> +# 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: |
> +  Bindings for the Microchip family of Power Monitors with Accumulator.

Drop "Bindings for" and describe instead the hardware.

> +  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:
> +    description: IRQ line of the ADC

Drop, useless.

> +    maxItems: 1
> +
> +  drive-open-drain:
> +    description: The IRQ signal is configured as open-drain.
> +    type: boolean


> +    maxItems: 1
> +
> +  microchip,slow-io:
> +    type: boolean
> +    description: |
> +      A GPIO used to trigger a change is sampling rate (lowering the chip power consumption).
> +      In default mode, if this pin is forced high, sampling rate is forced to eight
> +      samples/second. When it is forced low, the sampling rate is 1024 samples/second unless
> +      a different sample rate has been programmed.
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +patternProperties:

patternProperties: follow properties:, not required: block. Reorder.

> +  "^channel@[1-4]+$":
> +    type: object
> +    $ref: adc.yaml
> +    description: Represents the external channels which are connected to the ADC.
> +
> +    properties:
> +      reg:
> +        description: |
> +          The channel number.
> +          It can have up to 4 channels, numbered from 1 to 4.

Drop, redundant, comes with adc.yaml.

> +        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.
> +
> +      label:
> +        $ref: /schemas/types.yaml#/definitions/string
> +        description: Name of the monitored power rail.

Drop property, comes with adc.yaml.

> +
> +      bipolar:
> +        description: Whether the channel is bi-directional.
> +        type: boolean

Drop property, comes with adc.yaml.
> +
> +    required:
> +      - reg
> +      - shunt-resistor-micro-ohms
> +
> +    additionalProperties: false

unevaluatedProperties: false

> +
> +allOf:
> +  - if:
> +      required:
> +        - interrupts
> +    then:
> +      required:
> +        - drive-open-drain
> +    else:
> +      properties:
> +        drive-open-drain: false
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        pac193x: pac193x@10 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +            compatible = "microchip,pac1934";
> +            reg = <0x10>;
> +

Best regards,
Krzysztof