linux-kernel - Re: [PATCH v9 1/3] dt-bindings: hwmon: fan: Add fan binding to schema

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Date:   Mon, 2 Oct 2023 10:23:43 -0500
From:   Rob Herring <robh@...nel.org>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     jdelvare@...e.com, linux@...ck-us.net,
        krzysztof.kozlowski+dt@...aro.org, joel@....id.au, andrew@...id.au,
        corbet@....net, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de, p.zabel@...gutronix.de,
        naresh.solanki@...ements.com, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-pwm@...r.kernel.org,
        BMC-SW@...eedtech.com, patrick@...cx.xyz
Subject: Re: [PATCH v9 1/3] dt-bindings: hwmon: fan: Add fan binding to schema

On Mon, Sep 18, 2023 at 02:41:09PM +0800, Billy Tsai wrote:
> From: Naresh Solanki <naresh.solanki@...ements.com>
> 
> 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
>       $ref: fan-common.yaml#
>       unevaluatedProperties: false
> 
> Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
> Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
> ---
>  .../devicetree/bindings/hwmon/fan-common.yaml | 78 +++++++++++++++++++
>  1 file changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/fan-common.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/fan-common.yaml b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> new file mode 100644
> index 000000000000..2bd2f57fc9d9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/fan-common.yaml
> @@ -0,0 +1,78 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$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@...ements.com>
> +  - Billy Tsai <billy_tsai@...eedtech.com>
> +
> +properties:
> +  max-rpm:
> +    description:
> +      Max RPM supported by fan.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 100000
> +
> +  min-rpm:
> +    description:
> +      Min RPM supported by fan.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 1000
> +
> +  pulses-per-revolution:
> +    description:
> +      The number of pulse from fan sensor per revolution.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 4
> +
> +  tach-div:
> +    description:
> +      Divisor for the tach sampling clock, which determines the sensitivity of the tach pin.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  target-rpm:
> +    description:
> +      The default desired fan speed in RPM.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  fan-driving-mode:
> +    description:
> +      Select the driving mode of the fan.(DC, PWM and so on)
> +    $ref: /schemas/types.yaml#/definitions/uint32

What value corresponds to what mode? I'd do strings instead. 'dc', 
'pwm', etc.

> +
> +  pwms:
> +    description:
> +      PWM provider.
> +    maxItems: 1
> +
> +  "#cooling-cells":
> +    const: 2
> +
> +  cooling-levels:
> +    description: |

Don't need '|'

> +      The control value which correspond to thermal cooling states.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +
> +  tach-ch:
> +    description:
> +      The tach channel used for the fan.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +
> +  label:
> +    description:
> +      Optional fan label
> +
> +  fan-supply:
> +    description:
> +      Power supply for fan.
> +
> +  reg:
> +    maxItems: 1
> +
> +additionalProperties: true
> +
> +...
> -- 
> 2.25.1
>