[PATCH 1/5] dt-bindings: mfd: khadas-mcu: add cooling-levels property

[neil.armstrong at linaro.org]

On 26/06/2025 16:04, muhammed.efecetin.67 at gmail.com wrote:
> From: Muhammed Efe Cetin <efectn at protonmail.com>
> 
> Add fan controlling step property which is used by Khadas Edge 2.
> 
> Signed-off-by: Muhammed Efe Cetin <efectn at protonmail.com>
> ---
>   Documentation/devicetree/bindings/mfd/khadas,mcu.yaml | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml b/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml
> index 084960fd5..f69643aae 100644
> --- a/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml
> +++ b/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml
> @@ -11,7 +11,7 @@ maintainers:
>   
>   description: |
>     Khadas embeds a microcontroller on their VIM and Edge boards adding some
> -  system feature as PWM Fan control (for VIM2 rev14 or VIM3), User memory
> +  system feature as PWM Fan control (for VIM2 rev14, VIM3, Edge2), User memory
>     storage, IR/Key resume control, system power LED control and more.
>   
>   properties:
> @@ -22,6 +22,13 @@ properties:
>     "#cooling-cells": # Only needed for boards having FAN control feature
>       const: 2
>   
> +  cooling-levels:
> +    description:
> +      Max speed of PWM fan, from 0 to 100. This property is necessary for Khadas Edge 2.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    items:
> +      maximum: 100

The cooling level can be detected dynamically by reading the MCU register, so
just set the max_level to 100 when edge2 is detected, and drop this property.

Neil

> +
>     reg:
>       maxItems: 1
>