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charset="utf-8" Add support for the AD4880, a dual-channel 20-bit 40MSPS SAR ADC with integrated fully differential amplifiers (FDA). The AD4880 has two independent ADC channels, each with its own SPI configuration interface. This requires: - Two entries in reg property for primary and secondary channel chip selects - Two io-backends entries for the two data channels Signed-off-by: Antoniu Miclaus --- Changes in v4: - Drop redundant maxItems from io-backends since the items list already constrains the maximum count .../bindings/iio/adc/adi,ad4080.yaml | 53 ++++++++++++++++++- 1 file changed, 51 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4080.yaml b/Do= cumentation/devicetree/bindings/iio/adc/adi,ad4080.yaml index ccd6a0ac1539..0cf86c6f9925 100644 --- a/Documentation/devicetree/bindings/iio/adc/adi,ad4080.yaml +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4080.yaml @@ -18,7 +18,11 @@ description: | service a wide variety of precision, wide bandwidth data acquisition applications. =20 + The AD4880 is a dual-channel variant with two independent ADC channels, + each with its own SPI configuration interface. + https://www.analog.com/media/en/technical-documentation/data-sheets/ad40= 80.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad48= 80.pdf =20 $ref: /schemas/spi/spi-peripheral-props.yaml# =20 @@ -31,9 +35,15 @@ properties: - adi,ad4084 - adi,ad4086 - adi,ad4087 + - adi,ad4880 =20 reg: - maxItems: 1 + minItems: 1 + maxItems: 2 + description: + SPI chip select(s). For single-channel devices, one chip select. + For multi-channel devices like AD4880, two chip selects are required + as each channel has its own SPI configuration interface. =20 spi-max-frequency: description: Configuration of the SPI bus. @@ -57,7 +67,10 @@ properties: vrefin-supply: true =20 io-backends: - maxItems: 1 + minItems: 1 + items: + - description: Backend for channel A (primary) + - description: Backend for channel B (secondary) =20 adi,lvds-cnv-enable: description: Enable the LVDS signal type on the CNV pin. Default is CM= OS. @@ -78,6 +91,25 @@ required: - vdd33-supply - vrefin-supply =20 +allOf: + - if: + properties: + compatible: + contains: + const: adi,ad4880 + then: + properties: + reg: + minItems: 2 + io-backends: + minItems: 2 + else: + properties: + reg: + maxItems: 1 + io-backends: + maxItems: 1 + additionalProperties: false =20 examples: @@ -98,4 +130,21 @@ examples: io-backends =3D <&iio_backend>; }; }; + - | + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + + adc@0 { + compatible =3D "adi,ad4880"; + reg =3D <0>, <1>; + spi-max-frequency =3D <10000000>; + vdd33-supply =3D <&vdd33>; + vddldo-supply =3D <&vddldo>; + vrefin-supply =3D <&vrefin>; + clocks =3D <&cnv>; + clock-names =3D "cnv"; + io-backends =3D <&iio_backend_cha>, <&iio_backend_chb>; + }; + }; ... --=20 2.43.0