Re: [PATCH v2 1/2] dt-bindings: iio: light: Add Capella CM3217

[Conor Dooley]

On Fri, Nov 06, 2026 at 09:56:29PM +0100, Patrick Fischer via B4 Relay wrote:
> From: Patrick Fischer <admin@xxxxxxxxxxxxxxxxxx>
> 
> The Capella CM3217 is an ambient light sensor with an I2C interface but
> without registers and without an interrupt line. It always answers on
> the two addresses 0x10 and 0x11. The node describes the first address;
> the second one is fixed.
> 
> The sensor is used in the NVIDIA Tegra Note 7 and the NVIDIA Shield
> Tablet.
> 
> Signed-off-by: Patrick Fischer <admin@xxxxxxxxxxxxxxxxxx>
> ---
>  .../bindings/iio/light/capella,cm3217.yaml         | 51 ++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/light/capella,cm3217.yaml b/Documentation/devicetree/bindings/iio/light/capella,cm3217.yaml
> new file mode 100644
> index 000000000000..7f2a0d5d0243
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/light/capella,cm3217.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/light/capella,cm3217.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Capella CM3217 ambient light sensor
> +
> +maintainers:
> +  - Patrick Fischer <admin@xxxxxxxxxxxxxxxxxx>
> +
> +description:
> +  The CM3217 is an I2C ambient light sensor without registers or interrupt
> +  line.
> +
> +properties:
> +  compatible:
> +    const: capella,cm3217
> +
> +  reg:
> +    description:
> +      The sensor always occupies the two fixed I2C addresses 0x10 and 0x11.
> +      Writing a byte to 0x10 sets command byte 1 (shutdown and IT_T), reading
> +      a byte from it returns the high byte of the light count. Writing a byte
> +      to 0x11 sets command byte 2 (FD_IT), reading a byte from it returns the
> +      low byte. Only the first address is given here, the second one is
> +      implied.
> +    const: 0x10

I think this should actually contain both addresses, the i2c-controller
binding permits children with "one or many i2c target addresses".


> +
> +  vdd-supply: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - vdd-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        light-sensor@10 {
> +            compatible = "capella,cm3217";
> +            reg = <0x10>;
> +            vdd-supply = <&vdd_2v85_sen>;
> +        };
> +    };
> +...
> 
> -- 
> 2.56.0
> 
>

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