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>;
> + };