Re: [PATCH v6 01/11] dt-bindings: trigger-source: add generic GPIO trigger source

[Jonathan Cameron <jic23@kernel.org>]

On Sun, 27 Apr 2025 21:12:02 -0300
Jonathan Santos <Jonathan.Santos@analog.com> wrote:

> Inspired by pwm-trigger, create a new binding for using a GPIO
> line as a trigger source.
> 
> Link: https://lore.kernel.org/linux-iio/20250207-dlech-mainline-spi-engine-offload-2-v8-3-e48a489be48c@baylibre.com/

David, given you did the pwm one, maybe give this a quick look.

Maybe it's worth generalising to cover all trigger sources in MAINTAINERS?

Thanks. Otherwise I obviously need a DT review before taking this and maybe the GPIO
element suggests Linus W or Bartosz might be other good reviewers?

Jonathan

> Signed-off-by: Jonathan Santos <Jonathan.Santos@analog.com>
> ---
> v6 Changes:
> * Changed description.
> * Fixed typos and replaced GPIO pin with GPIO line.
> * Added link reference for pwm-trigger.
> 
> v5 Changes:
> * New patch in v5.
> ---
>  .../bindings/trigger-source/gpio-trigger.yaml | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml
> 
> diff --git a/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml b/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml
> new file mode 100644
> index 000000000000..1331d153ee82
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/trigger-source/gpio-trigger.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic trigger source using GPIO
> +
> +description: A GPIO used as a trigger source.
> +
> +maintainers:
> +  - Jonathan Santos <Jonathan.Santos@analog.com>
> +
> +properties:
> +  compatible:
> +    const: gpio-trigger
> +
> +  '#trigger-source-cells':
> +    const: 0
> +
> +  gpios:
> +    maxItems: 1
> +    description: GPIO to be used as a trigger source.
> +
> +required:
> +  - compatible
> +  - '#trigger-source-cells'
> +  - gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    trigger {
> +        compatible = "gpio-trigger";
> +        #trigger-source-cells = <0>;
> +        gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
> +    };