linux-kernel - [PATCH v2 3/4] dt-bindings: iio: adc: ad4080: add AD4880 support

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Message-ID: <290f35bcbd2f1ee68333ff65f89b54ec7fbb9c53.1770393792.git.antoniu.miclaus@analog.com>
Date: Fri, 6 Feb 2026 18:07:15 +0200
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich
	<Michael.Hennerich@...log.com>,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        David Lechner <dlechner@...libre.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Andy Shevchenko
	<andy@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Olivier Moysan
	<olivier.moysan@...s.st.com>,
        Mark Brown <broonie@...nel.org>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>
Subject: [PATCH v2 3/4] dt-bindings: iio: adc: ad4080: add AD4880 support

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@...log.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