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

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Date: Thu, 21 Mar 2024 07:17:27 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Rob Herring <robh@...nel.org>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Jean Delvare <jdelvare@...e.com>,
 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 3/21/24 07:03, Rob Herring wrote:
> 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.
> 

There are industrial fans with much higher rpm. mouser.com lists one
with more than 60,000 rpm, but I am sure I have seen some with more than
100k rpm.

Guenter