On 8/29/25 7:45 PM, Marcelo Schmitt wrote:
> ADAQ4216 and ADAQ4224 are similar to AD4030 except ADAQ devices have a PGA
> (programmable gain amplifier) that scales the input signal prior to it
> reaching the ADC inputs. The PGA is controlled through a couple of pins (A0
> and A1) that set one of four possible signal gain.
>
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
> ---
> The PGA doc was inspired on ad7191 dt-binding and uses the same properies (but
> with different values) to describe the hardware.
>
> .../bindings/iio/adc/adi,ad4030.yaml | 39 +++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> index 9adb60629631..36fd2aa51922 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> @@ -19,6 +19,8 @@ description: |
> * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4030-24-4032-24.pdf
> * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-24_ad4632-24.pdf
> * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-16-4632-16.pdf
> + * https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4216.pdf
> + * https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4224.pdf
>
> $ref: /schemas/spi/spi-peripheral-props.yaml#
>
> @@ -31,6 +33,8 @@ properties:
> - adi,ad4630-24
> - adi,ad4632-16
> - adi,ad4632-24
> + - adi,adaq4216
> + - adi,adaq4224
>
> reg:
> maxItems: 1
> @@ -64,6 +68,27 @@ properties:
> The Reset Input (/RST). Used for asynchronous device reset.
> maxItems: 1
>
> + pga-gpios:
> + description:
> + A0 and A1 pins for gain selection. For devices that have PGA configuration
> + input pins, pga-gpios should be defined if adi,gain-milli is absent.
> + minItems: 2
> + maxItems: 2
> +
> + adi,pga-value:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Should be present if PGA control inputs are pin-strapped. The values
> + specify the gain per mille. For example, 333 means the input signal is
> + scaled by a 0.333 factor (i.e. attenuated to one third of it's original
> + magnitude). Possible values:
> + Gain 333 (A1=0, A0=0)
> + Gain 556 (A1=0, A0=1)
> + Gain 2222 (A1=1, A0=0)
> + Gain 6667 (A1=1, A0=1)
> + If defined, pga-gpios must be absent.
> + enum: [333, 556, 2222, 6667]
> +
It looks like these chips have some different power supplies
as well. E.g. V_DDH, VDD_FDA, VSS_FDA, VLDO. And there is only
REFIN, no REF.
> pwms:
> description: PWM signal connected to the CNV pin.
> maxItems: 1
> @@ -120,6 +145,20 @@ allOf:
> then:
> properties:
> adi,dual-data-rate: false
> + # ADAQ devices require a gain property to indicate how hardware PGA is set
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - adi,adaq4216
> + - adi,adaq4224
Could use pattern instead:
pattern: ^adi,adaq
> + then:
> + oneOf:
> + - required:
> + - adi,pga-value
> + - required:
> + - pga-gpios
else:
adi,pga-value: false
pga-gpios: false
>
> unevaluatedProperties: false
>