Re: [PATCH 2/8] dt-bindings: iio: adc: ad7606: Add iio backend bindings

[Jonathan Cameron <jic23@kernel.org>]

On Thu, 15 Aug 2024 12:11:56 +0000
Guillaume Stols <gstols@baylibre.com> wrote:

> Add the required properties for iio-backend support, as well as an
> example and the conditions to mutually exclude interruption and
> conversion trigger with iio-backend.
> The iio-backend's function is to controls the communication, and thus the
> interruption pin won't be available anymore.
> As a consequence, the conversion pin must be controlled externally since
> we will miss information about when every single conversion cycle (i.e
> conversion + data transfert) ends, hence a PWM is introduced to trigger

transfer

> the conversions.
> 
> Signed-off-by: Guillaume Stols <gstols@baylibre.com>
> ---
>  .../devicetree/bindings/iio/adc/adi,ad7606.yaml    | 75 +++++++++++++++++++++-
>  1 file changed, 72 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> index c0008d36320f..4b324f7e3207 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> @@ -114,13 +114,28 @@ properties:
>        assumed that the pins are hardwired to VDD.
>      type: boolean
>  
> +  pwms:
> +    description:
> +      In case the conversion is triggered by a PWM instead of a GPIO plugged to
> +      the CONVST pin, the PWM must be referenced.
> +    minItems: 1
> +    maxItems: 2
> +
> +  pwm-names:
> +    minItems: 1
> +    maxItems: 2
> +
> +  io-backends:
> +    description:
> +      A reference to the iio-backend, which is responsible handling the BUSY
> +      pin's falling edge and communication.
> +      An example of backend can be found at
> +      http://analogdevicesinc.github.io/hdl/library/axi_ad7606x/index.html
> +
>  required:
>    - compatible
> -  - reg

I think we still want a reg, but only to differentiate multiple instances
perhaps.

>    - avcc-supply
>    - vdrive-supply