linux-kernel - Re: [PATCH 2/2] dt-bindings: hwmon: max6650: convert to dtschema

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Message-ID: <20240321140336.GA1648289-robh@kernel.org>
Date: Thu, 21 Mar 2024 09:03:36 -0500
From: Rob Herring <robh@...nel.org>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, peiyu li <579lpy@...il.com>,
	linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: hwmon: max6650: convert to dtschema

On Wed, Mar 20, 2024 at 06:04:58PM +0100, Javier Carrasco wrote:
>  Convert existing bindings to dtschema to support validation.
> 
>  This is a straightforward conversion with no new properties.

Why the indentation?

> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
> ---
>  .../devicetree/bindings/hwmon/max6650.txt          | 28 ---------
>  .../devicetree/bindings/hwmon/maxim,max6650.yaml   | 68 ++++++++++++++++++++++
>  2 files changed, 68 insertions(+), 28 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/max6650.txt b/Documentation/devicetree/bindings/hwmon/max6650.txt
> deleted file mode 100644
> index f6bd87d8e284..000000000000
> --- a/Documentation/devicetree/bindings/hwmon/max6650.txt
> +++ /dev/null
> @@ -1,28 +0,0 @@
> -Bindings for MAX6651 and MAX6650 I2C fan controllers
> -
> -Reference:
> -[1]	https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf
> -
> -Required properties:
> -- compatible : One of "maxim,max6650" or "maxim,max6651"
> -- reg        : I2C address, one of 0x1b, 0x1f, 0x4b, 0x48.
> -
> -Optional properties, default is to retain the chip's current setting:
> -- maxim,fan-microvolt : The supply voltage of the fan, either 5000000 uV or
> -			12000000 uV.
> -- maxim,fan-prescale  : Pre-scaling value, as per datasheet [1]. Lower values
> -			allow more fine-grained control of slower fans.
> -			Valid: 1, 2, 4, 8, 16.
> -- maxim,fan-target-rpm: Initial requested fan rotation speed. If specified, the
> -			driver selects closed-loop mode and the requested speed.
> -			This ensures the fan is already running before userspace
> -			takes over.
> -
> -Example:
> -	fan-max6650: max6650@1b {
> -		reg = <0x1b>;
> -		compatible = "maxim,max6650";
> -		maxim,fan-microvolt = <12000000>;
> -		maxim,fan-prescale = <4>;
> -		maxim,fan-target-rpm = <1200>;
> -	};
> diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max6650.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max6650.yaml
> new file mode 100644
> index 000000000000..1b33b5fb606d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/maxim,max6650.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/maxim,max6650.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim MAX6650 and MAX6651 I2C Fan Controllers
> +
> +maintainers:
> +  - Javier Carrasco <javier.carrasco.cruz@...il.com>
> +
> +description: |
> +  The MAX6650 and MAX6651 regulate and monitor the speed
> +  of 5VDC/12VDC burshless fans with built-in tachometers.
> +
> +  Datasheets:
> +    https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - maxim,max6650
> +      - maxim,max6651
> +
> +  reg:
> +    maxItems: 1
> +
> +  maxim,fan-microvolt:
> +    description:
> +      The supply voltage of the fan, either 5000000 uV or
> +      12000000 uV.

Looks like constraints. Please add them.

> +
> +  maxim,fan-prescale:
> +    description:
> +      Pre-scaling value, as per datasheet. Lower values
> +      allow more fine-grained control of slower fans.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [1, 2, 4, 8, 16]
> +
> +  maxim,fan-target-rpm:
> +    description:
> +      Initial requested fan rotation speed. If specified, the
> +      driver selects closed-loop mode and the requested speed.
> +      This ensures the fan is already running before userspace
> +      takes over.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Constraints? I'm sure no fan RPM is higher than 10000 and probably much 
less than that.

Rob