linux-kernel - Re: [PATCH v8 1/2] dt-bindings: mfd: Add bindings for MAX5970 and MAX5978

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Message-ID: <9396ee97-d6f3-f13b-8929-56c3920ee395@linaro.org>
Date:   Thu, 3 Nov 2022 17:49:51 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Patrick Rudolph <patrick.rudolph@...ements.com>
Cc:     Marcello Sylvester Bauer <sylv@...v.io>
Subject: Re: [PATCH v8 1/2] dt-bindings: mfd: Add bindings for MAX5970 and
 MAX5978

On 03/11/2022 17:34, Naresh Solanki wrote:
> From: Marcello Sylvester Bauer <sylv@...v.io>
> 

Subject: drop redundant (second) word "bindings"

> The MAX597x is a hot swap controller with configurable fault protection.
> It also has 10bit ADC for current & voltage measurements.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>

Isn't this third version per day? That's too many. Please keep it one
per day (usually).


> ---
>  .../bindings/mfd/maxim,max5970.yaml           | 170 ++++++++++++++++++
>  1 file changed, 170 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml b/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> new file mode 100644
> index 000000000000..25079c518f68
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> @@ -0,0 +1,170 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/maxim,max5970.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Regulator for MAX5970 smart switch from Maxim Integrated.
> +
> +maintainers:
> +  - Patrick Rudolph <patrick.rudolph@...ements.com>
> +
> +description: |
> +  The smart switch provides no output regulation, but independent fault protection
> +  and voltage and current sensing.
> +  Programming is done through I2C bus.
> +
> +  Datasheets:
> +    https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf
> +    https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - maxim,max5970
> +      - maxim,max5978
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  leds:
> +    type: object
> +    description:
> +      Properties for single channel.

This description seems odd. You have here several leds, so what is the
single channel?

> +
> +    properties:
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +    patternProperties:
> +      "^led@[0-3]$":
> +        $ref: /schemas/leds/common.yaml#
> +        type: object
> +
> +    additionalProperties: false
> +
> +  vss1-supply:
> +    description: Supply of the first channel.
> +
> +  vss2-supply:
> +    description: Supply of the first channel.
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +  regulators:
> +    type: object
> +    description:
> +      Properties for single channel.

That's another odd description.

> +
> +    patternProperties:
> +      "^(SW[0-1])$":

This should be lowercase. You also do not need ().

> +        $ref: /schemas/regulator/regulator.yaml#
> +        type: object
> +
> +      shunt-resistor-micro-ohms:
> +        description: |
> +          The value of curent sense resistor in microohms.
> +          Must be specified for each channel.

Drop last sentence and instead add "required:" with proper indent.

> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - regulators
> +  - vss1-supply
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - maxim,max5970
> +    then:
> +      properties:
> +        io-channels:
> +          items:
> +            - description: voltage first channel
> +            - description: current first channel
> +            - description: voltage second channel
> +            - description: current second channel
> +          description: |
> +            Voltage and current for first and second channel.

I do not understand the description.

Also, add it in the existing example.

> +      required:
> +        - vss2-supply
> +    else:
> +      properties:
> +        io-channels:
> +          items:
> +            - description: voltage first channel
> +            - description: current first channel
> +          description: |
> +            Voltage and current for first channel.

Same question for the description.

> +
> +additionalProperties: false
> +

Best regards,
Krzysztof