[v6,1/3] dt-bindings: hwmon: fan: Add fan binding to schema

Message ID	20221116213615.1256297-2-Naresh.Solanki@9elements.com (mailing list archive)
State	Changes Requested
Headers	show Return-Path: <linux-hwmon-owner@kernel.org> From: Naresh Solanki <naresh.solanki@9elements.com> To: devicetree@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>, Jean Delvare <jdelvare@suse.com>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Naresh Solanki <naresh.solanki@9elements.com> Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, Patrick Rudolph <patrick.rudolph@9elements.com>, Naresh Solanki <Naresh.Solanki@9elements.com> Subject: [PATCH v6 1/3] dt-bindings: hwmon: fan: Add fan binding to schema Date: Wed, 16 Nov 2022 22:36:13 +0100 Message-Id: <20221116213615.1256297-2-Naresh.Solanki@9elements.com> In-Reply-To: <20221116213615.1256297-1-Naresh.Solanki@9elements.com> References: <20221116213615.1256297-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add devicetree support for max6639 \| expand [v6,0/3] Add devicetree support for max6639 [v6,1/3] dt-bindings: hwmon: fan: Add fan binding to schema [v6,2/3] dt-bindings: hwmon: Add binding for max6639 [v6,3/3] hwmon: (max6639) Change from pdata to dt configuration

Naresh Solanki Nov. 16, 2022, 9:36 p.m. UTC

Add common fan properties bindings to a schema.

Bindings for fan controllers can reference the common schema for the
fan

child nodes:

  patternProperties:
    "^fan@[0-2]":
      type: object
      $ref: fan-common.yaml#

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml

Guenter Roeck Nov. 20, 2022, 3:13 p.m. UTC | #1

On Wed, Nov 16, 2022 at 10:36:13PM +0100, Naresh Solanki wrote:
> Add common fan properties bindings to a schema.
> 
> Bindings for fan controllers can reference the common schema for the
> fan
> 
> child nodes:
> 
>   patternProperties:
>     "^fan@[0-2]":
>       type: object
>       $ref: fan-common.yaml#
> 
> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> ---
>  .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> new file mode 100644
> index 000000000000..1954882eed77
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common fan properties
> +
> +maintainers:
> +  - Naresh Solanki <naresh.solanki@9elements.com>
> +
> +properties:
> +  max-rpm:
> +    description:
> +      Max RPM supported by fan.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pulses-per-revolution:
> +    description:
> +      The number of pulse from fan sensor per revolution.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  target-rpm:
> +    description:
> +      Target RPM the fan should be configured during driver probe.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pwms:
> +    description:
> +      PWM provider.
> +
> +  label:
> +    description:
> +      Optional fan label
> +
> +  fan-supply:
> +    description:
> +      Power supply for fan.
> +

I still think that at least min-rpm should be added. It is just as common
as max-rpm.

Guenter

> +additionalProperties: true
> +
> +...

Guenter Roeck Nov. 20, 2022, 3:25 p.m. UTC | #2

On Wed, Nov 16, 2022 at 10:36:13PM +0100, Naresh Solanki wrote:
> Add common fan properties bindings to a schema.
> 
> Bindings for fan controllers can reference the common schema for the
> fan
> 
> child nodes:
> 
>   patternProperties:
>     "^fan@[0-2]":
>       type: object
>       $ref: fan-common.yaml#
> 
> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> ---
>  .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> new file mode 100644
> index 000000000000..1954882eed77
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common fan properties
> +
> +maintainers:
> +  - Naresh Solanki <naresh.solanki@9elements.com>
> +
> +properties:
> +  max-rpm:
> +    description:
> +      Max RPM supported by fan.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pulses-per-revolution:
> +    description:
> +      The number of pulse from fan sensor per revolution.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  target-rpm:
> +    description:
> +      Target RPM the fan should be configured during driver probe.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pwms:
> +    description:
> +      PWM provider.
> +
> +  label:
> +    description:
> +      Optional fan label
> +
> +  fan-supply:
> +    description:
> +      Power supply for fan.
> +

Another property which is definitely missing and needed
will be DC vs. PWM control. That is currently pwm[1-*]_mode
in sysfs attributes, but it is really a fan attribute.

Many fans are DC controlled, so this property is absolutely
necessary.

Guenter

Rob Herring Nov. 20, 2022, 5:05 p.m. UTC | #3

On Sun, Nov 20, 2022 at 07:13:31AM -0800, Guenter Roeck wrote:
> On Wed, Nov 16, 2022 at 10:36:13PM +0100, Naresh Solanki wrote:
> > Add common fan properties bindings to a schema.
> > 
> > Bindings for fan controllers can reference the common schema for the
> > fan
> > 
> > child nodes:
> > 
> >   patternProperties:
> >     "^fan@[0-2]":
> >       type: object
> >       $ref: fan-common.yaml#
> > 
> > Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> > ---
> >  .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
> >  1 file changed, 42 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> > new file mode 100644
> > index 000000000000..1954882eed77
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> > @@ -0,0 +1,42 @@
> > +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Common fan properties
> > +
> > +maintainers:
> > +  - Naresh Solanki <naresh.solanki@9elements.com>
> > +
> > +properties:
> > +  max-rpm:
> > +    description:
> > +      Max RPM supported by fan.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +  pulses-per-revolution:
> > +    description:
> > +      The number of pulse from fan sensor per revolution.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +  target-rpm:
> > +    description:
> > +      Target RPM the fan should be configured during driver probe.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +  pwms:
> > +    description:
> > +      PWM provider.
> > +
> > +  label:
> > +    description:
> > +      Optional fan label
> > +
> > +  fan-supply:
> > +    description:
> > +      Power supply for fan.
> > +
> 
> I still think that at least min-rpm should be added. It is just as common
> as max-rpm.

Or a table if the response is not linear like LEDs/backlights? Though if 
there's a tach, that wouldn't be necessary.

Rob

Krzysztof Kozlowski Nov. 29, 2022, 8:08 a.m. UTC | #4

On 16/11/2022 22:36, Naresh Solanki wrote:
> Add common fan properties bindings to a schema.
> 
> Bindings for fan controllers can reference the common schema for the
> fan
> 
> child nodes:
> 
>   patternProperties:
>     "^fan@[0-2]":
>       type: object
>       $ref: fan-common.yaml#
> 
> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> ---
>  .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> new file mode 100644
> index 000000000000..1954882eed77
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common fan properties

If there is going to be resend - capitalize title, so:

Common Fan Properties

> +
> +maintainers:
> +  - Naresh Solanki <naresh.solanki@9elements.com>
> +
> +properties:
> +  max-rpm:
> +    description:
> +      Max RPM supported by fan.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pulses-per-revolution:
> +    description:
> +      The number of pulse from fan sensor per revolution.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  target-rpm:
> +    description:
> +      Target RPM the fan should be configured during driver probe.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  pwms:
> +    description:
> +      PWM provider.

Isn't this object? If so, maybe:
  type: object



Best regards,
Krzysztof

Naresh Solanki Nov. 29, 2022, 3:45 p.m. UTC | #5

Hi Krzysztof,

On 29-11-2022 01:38 pm, Krzysztof Kozlowski wrote:
> On 16/11/2022 22:36, Naresh Solanki wrote:
>> Add common fan properties bindings to a schema.
>>
>> Bindings for fan controllers can reference the common schema for the
>> fan
>>
>> child nodes:
>>
>>    patternProperties:
>>      "^fan@[0-2]":
>>        type: object
>>        $ref: fan-common.yaml#
>>
>> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
>> ---
>>   .../devicetree/bindings/hwmon/fan-common.yaml | 42 +++++++++++++++++++
>>   1 file changed, 42 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
>> new file mode 100644
>> index 000000000000..1954882eed77
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
>> @@ -0,0 +1,42 @@
>> +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Common fan properties
> 
> If there is going to be resend - capitalize title, so:
> 
> Common Fan Properties
> 
Sure
>> +
>> +maintainers:
>> +  - Naresh Solanki <naresh.solanki@9elements.com>
>> +
>> +properties:
>> +  max-rpm:
>> +    description:
>> +      Max RPM supported by fan.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> +  pulses-per-revolution:
>> +    description:
>> +      The number of pulse from fan sensor per revolution.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> +  target-rpm:
>> +    description:
>> +      Target RPM the fan should be configured during driver probe.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> +  pwms:
>> +    description:
>> +      PWM provider.
> 
> Isn't this object? If so, maybe:
>    type: object
With make dt_binding_check, I'm getting error for this.
Looking at other available examples in documentation, type object is not 
used.

Example:
   pwms:
     maxItems: 1

One pwm per fan.
> 
> 
> 
> Best regards,
> Krzysztof
> 
Regards,
Naresh

[v6,1/3] dt-bindings: hwmon: fan: Add fan binding to schema

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