linux-kernel - Re: [PATCH v7 2/4] dt-bindings: hwmon: Add binding for max6639

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Message-ID: <b6943ec7-8fcd-08dc-605d-4a23629bc39c@linaro.org>
Date:   Tue, 29 Nov 2022 09:14:24 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        devicetree@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Roland Stigge <stigge@...com.de>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Marcello Sylvester Bauer <sylv@...v.io>
Subject: Re: [PATCH v7 2/4] dt-bindings: hwmon: Add binding for max6639

On 21/11/2022 13:29, Naresh Solanki wrote:
> From: Marcello Sylvester Bauer <sylv@...v.io>
> 
> Add Devicetree binding documentation for Maxim MAX6639 temperature
> monitor with PWM fan-speed controller.
> 
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
>  .../bindings/hwmon/maxim,max6639.yaml         | 93 +++++++++++++++++++
>  1 file changed, 93 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
> new file mode 100644
> index 000000000000..da040b11d2ab
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
> @@ -0,0 +1,93 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/maxim,max6639.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim max6639
> +
> +maintainers:
> +  - Roland Stigge <stigge@...com.de>
> +
> +description: |
> +  The MAX6639 is a 2-channel temperature monitor with dual, automatic, PWM
> +  fan-speed controller.  It monitors its own temperature and one external
> +  diode-connected transistor or the temperatures of two external diode-connected
> +  transistors, typically available in CPUs, FPGAs, or GPUs.
> +
> +  Datasheets:
> +    https://datasheets.maximintegrated.com/en/ds/MAX6639-MAX6639F.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - maxim,max6639
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  '#pwm-cells':
> +    const: 3
> +
> +required:
> +  - compatible
> +  - reg
> +
> +patternProperties:
> +  "^fan@[0-1]$":
> +    type: object
> +    description: |
> +      Represents the two fans and their specific configuration.
> +
> +    $ref: fan-common.yaml#

unevalauatedProperties: false

> +
> +    properties:
> +      reg:
> +        description: |
> +          The fan number.
> +        items:
> +          minimum: 0
> +          maximum: 1

This is a bit unusual syntax. Drop "items", I think it should be more
obvious.

> +
> +    required:
> +      - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        fan1: fan-controller@10 {
> +            compatible = "maxim,max6639";
> +            reg = <0x10>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            #pwm-cells = <3>;
> +
> +            fan@0 {
> +                reg = <0x0>;
> +                pulses-per-revolution = <2>;
> +                max-rpm = <4000>;
> +                target-rpm = <1000>;
> +                pwms = <&fan1 0 25000 0>;
> +            };
> +
> +            fan@1 {
> +                reg = <0x1>;
> +                pulses-per-revolution = <2>;
> +                max-rpm = <8000>;
> +                pwms = <&fan1 1 25000 0>;
> +            };
> +            };

Fix indentation.

> +    };
> +...

Best regards,
Krzysztof