Re: [PATCH v6 1/3] dt-bindings: pwm: Add Raspberry Pi RP1 PWM controller

On 03/07/2026 19:05, Andrea della Porta wrote:
> From: Naushir Patuck <[email protected]>
> 
> Add the devicetree binding documentation for the PWM
> controller found in the Raspberry Pi RP1 chipset.
> 
> Signed-off-by: Naushir Patuck <[email protected]>
> Co-developed-by: Stanimir Varbanov <[email protected]>
> Signed-off-by: Stanimir Varbanov <[email protected]>
> Signed-off-by: Andrea della Porta <[email protected]>
> Reviewed-by: Krzysztof Kozlowski <[email protected]>

Reviewed-by: Matthias Brugger <[email protected]>

> ---
>   .../bindings/pwm/raspberrypi,rp1-pwm.yaml     | 66 +++++++++++++++++++
>   1 file changed, 66 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml b/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml
> new file mode 100644
> index 0000000000000..970d0f3b33bbb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/raspberrypi,rp1-pwm.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/raspberrypi,rp1-pwm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Raspberry Pi RP1 PWM controller
> +
> +maintainers:
> +  - Naushir Patuck <[email protected]>
> +  - Andrea della Porta <[email protected]>
> +  - Stanimir Varbanov <[email protected]>
> +
> +allOf:
> +  - $ref: pwm.yaml#
> +
> +description: |
> +  The PWM peripheral is a flexible waveform generator with a
> +  variety of operational modes. It has the following features:
> +   - four independent output channels
> +   - 32-bit counter widths
> +   - Seven output generation modes
> +   - Optional per-channel output inversion
> +   - Optional duty-cycle data FIFO with DMA support
> +   - Optional sigma-delta noise shaping engine
> +  Serves as a fan speed provider to other nodes for a PWM-connected
> +  fan using shared registers (syscon).
> +
> +properties:
> +  compatible:
> +    const: raspberrypi,rp1-pwm
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  "#pwm-cells":
> +    const: 3
> +
> +  dmas:
> +    maxItems: 1
> +    description: |
> +      Phandle to the DMA controller and the channel specifier for
> +      the duty-cycle FIFO.
> +
> +  dma-names:
> +    items:
> +      - const: tx
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    pwm@98000 {
> +      compatible = "raspberrypi,rp1-pwm";
> +      reg = <0x98000 0x100>;
> +      clocks = <&rp1_clocks 17>;
> +      #pwm-cells = <3>;
> +    };