[PATCH v2 3/4] dt-bindings: iio: adc: ad4080: add AD4880 support
From: Antoniu Miclaus <antoniu.miclaus@analog.com>
Date: 2026-02-06 16:08:05
Also in:
linux-iio, linux-spi, lkml
Subsystem:
analog devices inc ad4080 driver, analog devices inc iio drivers, iio subsystem and drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Antoniu Miclaus, Nuno Sá, Michael Hennerich, Jonathan Cameron, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <antoniu.miclaus@analog.com>
---
Changes in v2:
- Replace custom adi,aux-spi-cs property with standard reg property
containing two entries for multi-channel devices
- Add conditional schema validation for reg and io-backends based on
compatible string
- Update example to use reg = <0 1> instead of adi,aux-spi-cs
- Add AD4880 datasheet link
.../bindings/iio/adc/adi,ad4080.yaml | 51 ++++++++++++++++++-
1 file changed, 49 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4080.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4080.yaml
index ccd6a0ac1539..7108a91bb0bf 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. + 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/ad4080.pdf + https://www.analog.com/media/en/technical-documentation/data-sheets/ad4880.pdf $ref: /schemas/spi/spi-peripheral-props.yaml#
@@ -31,9 +35,15 @@ properties: - adi,ad4084 - adi,ad4086 - adi,ad4087 + - adi,ad4880 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. spi-max-frequency: description: Configuration of the SPI bus.
@@ -57,7 +67,8 @@ properties: vrefin-supply: true io-backends: - maxItems: 1 + minItems: 1 + maxItems: 2 adi,lvds-cnv-enable: description: Enable the LVDS signal type on the CNV pin. Default is CMOS.
@@ -78,6 +89,25 @@ required: - vdd33-supply - vrefin-supply +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 examples:
@@ -98,4 +128,21 @@ examples: io-backends = <&iio_backend>; }; }; + - | + spi { + #address-cells = <1>; + #size-cells = <0>; + + adc@0 { + compatible = "adi,ad4880"; + reg = <0 1>; + spi-max-frequency = <10000000>; + vdd33-supply = <&vdd33>; + vddldo-supply = <&vddldo>; + vrefin-supply = <&vrefin>; + clocks = <&cnv>; + clock-names = "cnv"; + io-backends = <&iio_backend_cha>, <&iio_backend_chb>; + }; + }; ...
--
2.43.0