linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: add MAX31827

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Date:   Thu, 6 Apr 2023 21:17:18 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Daniel Matyas <daniel.matyas@...log.com>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>, Marek Vasut <marex@...x.de>,
        Vincent Tremblay <vincent@...emblay.dev>,
        "Greg.Schwendimann@...ineon.com" <Greg.Schwendimann@...ineon.com>,
        Pali Rohár <pali@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: add MAX31827

On 06/04/2023 18:43, Daniel Matyas wrote:
> MAX31827 is a low-power temperature switch with I2C interface.
> 
> The device is a ±1°C accuracy from -40°C to +125°C
> (12 bits) local temperature switch and sensor with I2C/SM-
> Bus interface. The combination of small 6-bump wafer-lev-
> el package (WLP) and high accuracy makes this temper-
> ature sensor/switch ideal for a wide range of applications.
> 
> Signed-off-by: Daniel Matyas <daniel.matyas@...log.com>
> ---
>  .../bindings/hwmon/adi,max31827.yaml          | 48 +++++++++++++++++++
>  .../devicetree/bindings/trivial-devices.yaml  |  2 +
>  MAINTAINERS                                   |  7 +++

>  3 files changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> new file mode 100644
> index 000000000000..b6ed2d46a35d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/adi,max31827.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch

Where are the compatibles? I expect them in such case to be compatible
with this 31827.

> +
> +maintainers:
> +  - Daniel Matyas <daniel.matyas@...log.com>
> +
> +description: |
> +  Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch with
> +  I2C Interface
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31827-MAX31829.pdf

Missing blank line

> +properties:
> +  compatible:
> +    enum:
> +      - adi,max31827
> +
> +  reg:
> +    maxItems: 1
> +
> +  vref-supply:
> +    description:
> +      Must have values in the interval (1.6V; 3.6V) in order for the device to
> +      function correctly.
> +
> +required:
> +  - compatible
> +  - reg
> +  - vref-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        status = "okay";

Drop status

> +        max31827: max31827@42 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Drop also label. You do not use it.


> +            compatible = "adi,max31827";
> +            reg = <0x42>;
> +            vref-supply = <&reg_vdd>;
> +        };
> +    };
> +...
> \ No newline at end of file

Patch error to fix.

> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
> index 6f482a254a1d..7763610b97bc 100644
> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> @@ -43,6 +43,8 @@ properties:
>            - adi,adp5589
>              # Analog Devices LT7182S Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher
>            - adi,lt7182s
> +            # MAX31827 Low-Power Temperature Switch with I2C interface
> +          - adi,max31827

No need for this.

Best regards,
Krzysztof