linux-kernel - Re: [PATCH v6 1/2] Add DT bindings YAML schema for PWM fan controller of LGM SoC

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Message-ID: <20200731181944.GB516550@bogus>
Date:   Fri, 31 Jul 2020 12:19:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rahul Tanwar <rahul.tanwar@...ux.intel.com>
Cc:     u.kleine-koenig@...gutronix.de, linux-pwm@...r.kernel.org,
        lee.jones@...aro.org, thierry.reding@...il.com,
        p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, andriy.shevchenko@...el.com,
        songjun.Wu@...el.com, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com, rahul.tanwar.linux@...il.com
Subject: Re: [PATCH v6 1/2] Add DT bindings YAML schema for PWM fan
 controller of LGM SoC

On Tue, Jul 28, 2020 at 04:52:12PM +0800, Rahul Tanwar wrote:
> Intel's LGM(Lightning Mountain) SoC contains a PWM fan controller
> which is only used to control the fan attached to the system. This
> PWM controller does not have any other consumer other than fan.
> Add DT bindings documentation for this PWM fan controller.
> 
> Signed-off-by: Rahul Tanwar <rahul.tanwar@...ux.intel.com>
> ---
>  .../devicetree/bindings/pwm/intel,lgm-pwm.yaml     | 54 ++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml b/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml
> new file mode 100644
> index 000000000000..9879972470dc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/intel,lgm-pwm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LGM SoC PWM fan controller
> +
> +maintainers:
> +  - Rahul Tanwar <rahul.tanwar@...el.com>
> +
> +properties:
> +  compatible:
> +    const: intel,lgm-pwm
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#pwm-cells":
> +    const: 2
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  intel,fan-wire:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    description: Specifies fan mode. Default when unspecified is 2.
> +
> +  intel,max-rpm:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    description:
> +      Specifies maximum RPM of fan attached to the system.
> +      Default when unspecified is 4000.

Again, these are properties of a fan, not the pwm controller. They 
belong in a fan node.

> +
> ++required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pwm: pwm@...00000 {
> +        compatible = "intel,lgm-pwm";
> +        reg = <0xe0d00000 0x30>;
> +        #pwm-cells = <2>;
> +        clocks = <&cgu0 126>;
> +        resets = <&rcu0 0x30 21>;
> +    };
> -- 
> 2.11.0
>