dt-bindings: iio: adc: Add adi,ad4052

Add dt-bindings for AD4052 family, devices AD4050/AD4052/AD4056/AD4058,
low-power with monitor capabilities SAR ADCs.
Each variant of the family differs in speed and resolution, resulting
in different scan types and spi word sizes, that are matched by the
compatible with the chip_info.
The device contains two required interrupts (gp0, gp1) and one optional
gpio (cnv).

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml

@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad4052.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD4052 ADC family device driver
+
+maintainers:
+  - Jorge Marques <jorge.marques@analog.com>
+
+description: |
+  Analog Devices AD4052 Single Channel Precision SAR ADC family
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4050-ad4056.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4052-ad4058.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad4050
+      - adi,ad4052
+      - adi,ad4056
+      - adi,ad4058
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Signal coming from the GP0 pin (threshold).
+      - description: Signal coming from the GP1 pin (data ready).
+
+  interrupt-names:
+    items:
+      - const: gp0
+      - const: gp1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+    description: |
+      The first cell is the GPn number: 0 to 1.
+      The second cell takes standard GPIO flags.
+
+  cnv-gpios:
+    description: The Convert Input (CNV). If omitted, CNV is tied to SPI CS.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 62500000
+
+  vdd-supply:
+    description: Analog power supply.
+
+  vio-supply:
+    description: Digital interface logic power supply.
+
+  vref-supply:
+    description: Reference voltage to set the ADC full-scale range.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - vdd-supply
+  - vio-supply
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad4052";
+            reg = <0>;
+            vdd-supply = <&adc_vdd>;
+            vio-supply = <&adc_vio>;
+            spi-max-frequency = <25000000>;
+
+            interrupt-parent = <&gpio>;
+            interrupts = <0 0 IRQ_TYPE_EDGE_RISING>,
+                         <0 1 IRQ_TYPE_EDGE_FALLING>;
+            interrupt-names = "gp0", "gp1";
+            cnv-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+        };
+    };
+...