dt-bindings: iio: adc: add ADI ad4030, ad4630 and ad4632

This adds a binding specification for the Analog Devices Inc. AD4030,
AD4630 and AD4632 families of ADCs.

- ad4030-24 is a 1 channel SAR ADC with 24 bits of precision and a
  sampling rate of 2M samples per second
- ad4032-24 is a 1 channel SAR ADC with 24 bits of precision and a
  sampling rate of 500K samples per second
- ad4630-16 is a 2 channels SAR ADC with 16 bits of precision and a
  sampling rate of 2M samples per second
- ad4630-24 is a 2 channels SAR ADC with 24 bits of precision and a
  sampling rate of 2M samples per second
- ad4632-16 is a 2 channels SAR ADC with 16 bits of precision and a
  sampling rate of 500K samples per second
- ad4632-24 is a 2 channels SAR ADC with 24 bits of precision and a
  sampling rate of 500K samples per second

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Esteban Blanc <eblanc@baylibre.com>
Link: https://patch.msgid.link/20250214-eblanc-ad4630_v1-v4-1-135dd66cab6a@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml

@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2024 Analog Devices Inc.
+# Copyright 2024 BayLibre, SAS.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad4030.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD4030 and AD4630 ADC families
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+  - Nuno Sa <nuno.sa@analog.com>
+
+description: |
+  Analog Devices AD4030 single channel and AD4630/AD4632 dual channel precision
+  SAR ADC families
+
+  * 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
+
+properties:
+  compatible:
+    enum:
+      - adi,ad4030-24
+      - adi,ad4032-24
+      - adi,ad4630-16
+      - adi,ad4630-24
+      - adi,ad4632-16
+      - adi,ad4632-24
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 102040816
+
+  spi-rx-bus-width:
+    enum: [1, 2, 4]
+
+  vdd-5v-supply: true
+  vdd-1v8-supply: true
+  vio-supply: true
+
+  ref-supply:
+    description:
+      Optional External unbuffered reference. Used when refin-supply is not
+      connected.
+
+  refin-supply:
+    description:
+      Internal buffered Reference. Used when ref-supply is not connected.
+
+  cnv-gpios:
+    description:
+      The Convert Input (CNV). It initiates the sampling conversions.
+    maxItems: 1
+
+  reset-gpios:
+    description:
+      The Reset Input (/RST). Used for asynchronous device reset.
+    maxItems: 1
+
+  interrupts:
+    description:
+      The BUSY pin is used to signal that the conversions results are available
+      to be transferred when in SPI Clocking Mode. This nodes should be
+      connected to an interrupt that is triggered when the BUSY line goes low.
+    maxItems: 1
+
+  interrupt-names:
+    const: busy
+
+required:
+  - compatible
+  - reg
+  - vdd-5v-supply
+  - vdd-1v8-supply
+  - vio-supply
+  - cnv-gpios
+
+oneOf:
+  - required:
+      - ref-supply
+  - required:
+      - refin-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad4030-24";
+            reg = <0>;
+            spi-max-frequency = <80000000>;
+            vdd-5v-supply = <&supply_5V>;
+            vdd-1v8-supply = <&supply_1_8V>;
+            vio-supply = <&supply_1_8V>;
+            ref-supply = <&supply_5V>;
+            cnv-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+            reset-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+        };
+    };

MAINTAINERS

@@ -1306,6 +1306,15 @@ F:	Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml
 F:	Documentation/iio/ad4000.rst
 F:	drivers/iio/adc/ad4000.c
 
+AD4030 ADC DRIVER (AD4030-24/AD4630-16/AD4630-24/AD4632-16/AD4632-24)
+M:	Michael Hennerich <michael.hennerich@analog.com>
+M:	Nuno Sá <nuno.sa@analog.com>
+R:	Esteban Blanc <eblanc@baylibre.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
+
 ANALOG DEVICES INC AD4130 DRIVER
 M:	Cosmin Tanislav <cosmin.tanislav@analog.com>
 L:	linux-iio@vger.kernel.org