linux-kernel - Re: [PATCH v2 2/3] dt-bindings: hwmon: Add Microchip EMC2101 support

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Message-ID: <20250702-silent-capable-ferret-397cf8@krzk-bin>
Date: Wed, 2 Jul 2025 09:16:02 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Álvaro Fernández Rojas <noltari@...il.com>
Cc: jdelvare@...e.com, linux@...ck-us.net, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, corbet@....net, linux-hwmon@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/3] dt-bindings: hwmon: Add Microchip EMC2101 support

On Tue, Jul 01, 2025 at 08:12:27PM +0200, Álvaro Fernández Rojas wrote:
> Introduce yaml schema for Microchip emc2101 pwm fan controller with
> temperature monitoring.
> 
> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> ---
>  .../bindings/hwmon/microchip,emc2101.yaml     | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
> 
>  v2: add missing properties.
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
> new file mode 100644
> index 000000000000..0966559d373e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/microchip,emc2101.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip EMC2101 SMBus compliant PWM fan controller
> +
> +maintainers:
> +  - Álvaro Fernández Rojas <noltari@...il.com>
> +
> +description:
> +  Microchip EMC2101 pwm controller which supports up to 1 fan, 1 internal
> +  temperature sensor, 1 external temperature sensor and an 8 entry look
> +  up table to create a programmable temperature response.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,emc2101
> +      - microchip,emc2101-r

Nothing in description explains what 'r' is.

> +
> +  reg:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  '#pwm-cells':
> +    const: 2
> +    description: |
> +      Number of cells in a PWM specifier.
> +      - cell 0: The PWM frequency
> +      - cell 1: The PWM polarity: 0 or PWM_POLARITY_INVERTED
> +
> +patternProperties:
> +  '^fan@0$':

This is just 'fan', not a pattern. See other bidnings.

> +    $ref: fan-common.yaml#
> +    unevaluatedProperties: false
> +    properties:
> +      reg:
> +        description:
> +          The fan number used to determine the associated PWM channel.

I can tell you: 0. Cannot be any other PWM channel.

> +        maxItems: 1
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +  - reg

Best regards,
Krzysztof