On Wed, 23 Oct 2024 15:59:12 -0500 David Lechner <dlechner@xxxxxxxxxxxx> wrote: > Add a new binding for using a PWM signal as a trigger for SPI offloads. I don't have a better suggestion for this, but it does smell rather like other bridge binding (iio-hwmon for example) where we have had push back on representing something that doesn't really exist but is just a way to tie two bits of hardware together. Those kind of exist because we snuck them in a long time back when no one was paying attention. So this one may need more explanation and justification and I'd definitely like some DT maintainer review on this at a fairly early stage! (might have happened in earlier reviews but it has been a while so I've forgotten if it did) Jonathan > > Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> > --- > > v4 changes: new patch in v4 > --- > .../devicetree/bindings/spi/trigger-pwm.yaml | 39 ++++++++++++++++++++++ > 1 file changed, 39 insertions(+) > > diff --git a/Documentation/devicetree/bindings/spi/trigger-pwm.yaml b/Documentation/devicetree/bindings/spi/trigger-pwm.yaml > new file mode 100644 > index 000000000000..987638aa4732 > --- /dev/null > +++ b/Documentation/devicetree/bindings/spi/trigger-pwm.yaml > @@ -0,0 +1,39 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/spi/trigger-pwm.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Generic SPI offload trigger using PWM > + > +description: Remaps a PWM channel as a trigger source. > + > +maintainers: > + - David Lechner <dlechner@xxxxxxxxxxxx> > + > +$ref: /schemas/spi/trigger-source.yaml# > + > +properties: > + compatible: > + const: trigger-pwm > + > + '#trigger-source-cells': > + const: 0 > + > + pwms: > + maxItems: 1 > + > +required: > + - compatible > + - '#trigger-source-cells' > + - pwms > + > +additionalProperties: false > + > +examples: > + - | > + trigger { > + compatible = "trigger-pwm"; > + #trigger-source-cells = <0>; > + pwms = <&pwm 0 1000000 0>; > + }; >
