Re: [PATCH v3 2/3] dt-bindings: iio: light: isl29018: add isil,cover-comp-gain

[Conor Dooley]

On Thu, Jun 04, 2026 at 12:06:16PM +0200, Herman van Hazendonk wrote:
> Document the new optional property that seeds the ISL29018 calibration
> scale factor at boot from firmware, allowing boards with tinted cover
> glass to ship with correct luminance readings without a userspace helper.
> 
> The value is a positive integer (minimum 1, maximum 65535) that is
> multiplied with the raw lux reading.  Userspace can still override it
> at runtime through in_illuminance0_calibscale.
> 
> Signed-off-by: Herman van Hazendonk <github.com@xxxxxxxxxx>
> ---
>  .../devicetree/bindings/iio/light/isl29018.yaml     | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/light/isl29018.yaml b/Documentation/devicetree/bindings/iio/light/isl29018.yaml
> index 0ea278b07d1c..92ea2742bbd3 100644
> --- a/Documentation/devicetree/bindings/iio/light/isl29018.yaml
> +++ b/Documentation/devicetree/bindings/iio/light/isl29018.yaml
> @@ -34,6 +34,19 @@ properties:
>    vcc-supply:
>      description: Regulator that provides power to the sensor
>  
> +  isil,cover-comp-gain:
> +    description: |
> +      Multiplier applied to the ambient-light reading at startup to
> +      compensate for optical loss in the board's cover glass. Boards
> +      that mount the sensor under a tinted or coated window typically
> +      need a value between a few and a few hundred.

> The value seeds
> +      in_illuminance0_calibscale, so it can still be retuned at
> +      runtime through sysfs.

Delete this, driver implementation stuff isn't relevant to the
devicetree binding.

With that gone,
Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

pw-bot: changes-requested

Cheers,
Conor.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 1
> +    maximum: 65535
> +    default: 1
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.43.0
>

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