linux-kernel - Re: [PATCH v5 1/3] dt-bindings: hwmon: Add Microchip emc2305 support

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Message-ID: <7afcd224-1154-4e2f-b383-10f6a89fdae0@roeck-us.net>
Date: Tue, 18 Mar 2025 08:22:34 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: florin.leotescu@....nxp.com, Jean Delvare <jdelvare@...e.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Michael Shych <michaelsh@...dia.com>,
 linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: viorel.suman@....com, carlos.song@....com,
 linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
 festevam@...il.com, Florin Leotescu <florin.leotescu@....com>,
 Frank Li <Frank.Li@....com>
Subject: Re: [PATCH v5 1/3] dt-bindings: hwmon: Add Microchip emc2305 support

On 3/18/25 01:54, florin.leotescu@....nxp.com wrote:
> From: Florin Leotescu <florin.leotescu@....com>
> 
> Introduce yaml schema for Microchip emc2305 pwm fan controller.
> 
> Signed-off-by: Florin Leotescu <florin.leotescu@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---
>   .../bindings/hwmon/microchip,emc2305.yaml     | 113 ++++++++++++++++++
>   1 file changed, 113 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> new file mode 100644
> index 000000000000..e61ef97e63af
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
> @@ -0,0 +1,113 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/microchip,emc2305.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip EMC2305 SMBus compliant PWM fan controller
> +
> +maintainers:
> +  - Michael Shych <michaelsh@...dia.com>
> +
> +description:
> +  Microchip EMC2301/2/3/5 pwm controller which supports
> +  up to five programmable fan control circuits.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - microchip,emc2305
> +      - items:
> +          - enum:
> +              - microchip,emc2303
> +              - microchip,emc2302
> +              - microchip,emc2301
> +          - const: microchip,emc2305
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  '#pwm-cells':
> +    const: 3
> +    description: |
> +      Number of cells in a PWM specifier.
> +      - cell 0: The PWM frequency
> +      - cell 1: The PWM polarity: 0 or PWM_POLARITY_INVERTED
> +      - cell 2: The PWM output config:
> +           - 0 (Open-Drain)
> +           - 1 (Push-Pull)
> +
> +
> +patternProperties:
> +  '^fan@[0-4]$':
> +    $ref: fan-common.yaml#
> +    unevaluatedProperties: false
> +    properties:
> +      reg:
> +        description:
> +          The fan number used to determine the associated PWM channel.
> +
> +    required:
> +      - reg
> +      - pwms

Is it necessary to make 'pwms' mandatory ? The current code works
just fine with defaults.

Thanks,
Guenter