Re: [PATCH 1/4] dt-bindings: Add Raspberry Pi's RP1 ADC

Conor Dooley
2025-09-25T19:41:00Z

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On Thu, Sep 25, 2025 at 03:04:13AM +0300, Stanimir Varbanov wrote:
> Document dt-bindings for Raspberry Pi's RP1 ADC.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@suse.de>
> ---
> .../bindings/hwmon/raspberrypi,rp1-adc.yaml | 46 +++++++++++++++++++
> 1 file changed, 46 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml
>
> diff --git a/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml b/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml
> new file mode 100644
> index 000000000000..5266b253fd2b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/raspberrypi,rp1-adc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rasberry Pi RP1 ADC device
> +
> +maintainers:
> + - Stanimir Varbanov <svarbanov@suse.de>
> +
> +description: |
> + The RP1 ADC is a five input successive-approximation ADC with 12-bit
> + resolution (ENOB 9.5-bit) at 500kSPS. It has four external inputs
> + and one internal temperature sensor.
> +
> +properties:
> + compatible:
> + const: raspberrypi,rp1-adc
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + vref-supply:
> + description:
> + Reference voltage regulator 3.3V.

Looks like you're missing the io-channels-cells property that allows
this device to be a provider of adc channels to other devices.

> +
> +required:
> + - compatible
> + - reg
> + - clocks
> + - vref-supply
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + adc@400c8000 {
> + compatible = "raspberrypi,rp1-adc";
> + reg = <0x400c8000 0x4000>;
> + clocks = <&rp1_clocks 30>;
> + vref-supply = <&rp1_vdd_3v3>;
> + };
> --
> 2.47.0
>

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