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

Add dt-bindings for AD4052 family, devices AD4050/AD4052/AD4056/AD4058,
low-power with monitor capabilities SAR ADCs.
Contain selectable oversampling and sample rate, the latter for both
oversampling and monitor mode.
The monitor capability is exposed as an IIO threshold either direction
event.

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

Author: gastmaier

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

@@ -0,0 +1,105 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2024 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.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4052.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad4050
+      - adi,ad4052
+      - adi,ad4056
+      - adi,ad4058
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description:
+      Reference clock
+
+  interrupts:
+    maxItems: 1
+
+  dmas:
+    maxItems: 1
+
+  dma-names:
+    const: rx
+
+  pwms:
+    maxItems: 1
+
+  pwm-names:
+    const: cnv
+
+  cnv-gpios:
+    maxItems: 1
+
+  gp1-gpios:
+    maxItems: 1
+
+  gp0-gpios:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 25000000
+
+  vdd-supply: true
+  vdd_1_8-supply: true
+  vio-supply: true
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - dmas
+  - dma-names
+  - pwms
+  - pwm-names
+  - interrupts
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad4052";
+            reg = <0>;
+            spi-max-frequency = <25000000>;
+
+            clocks = <&clk0>;
+            dmas = <&dma 0>;
+            dma-names = "rx";
+            pwm-names = "cnv";
+            pwms = <&adc_trigger 0 0>;
+            cnv-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+            gp1-gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
+            gp0-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+            interrupts = <0 2>;
+            interrupt-parent = <&gpio>;
+        };
+    };
+...