regulator: max77857: Add ADI MAX77857/59/MAX77831 Regulator bindings

Add ADI MAX77857/59 and MAX77831 Regulator device tree document.
Signed-off-by: Okan Sahin <okan.sahin@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230717050736.10075-2-okan.sahin@analog.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/adi,max77857.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2022 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/adi,max77857.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX77857 Buck-Boost Converter
+
+maintainers:
+  - Ibrahim Tilki <Ibrahim.Tilki@analog.com>
+  - Okan Sahin <Okan.Sahin@analog.com>
+
+description: Analog Devices MAX77857 Buck-Boost Converter
+
+properties:
+  compatible:
+    enum:
+      - adi,max77831
+      - adi,max77857
+      - adi,max77859
+      - adi,max77859a
+
+  reg:
+    description: I2C address of the device
+    items:
+      - enum: [0x66, 0x67, 0x6E, 0x6F]
+
+  interrupts:
+    maxItems: 1
+
+  adi,switch-frequency-hz:
+    description: Switching frequency of the Buck-Boost converter in Hz.
+    items:
+      - enum: [1200000, 1500000, 1800000, 2100000]
+
+  adi,rtop-ohms:
+    description: Top feedback resistor value in ohms for external feedback.
+    minimum: 150000
+    maximum: 330000
+
+  adi,rbot-ohms:
+    description: Bottom feedback resistor value in ohms for external feedback.
+
+dependencies:
+  adi,rtop-ohms: [ 'adi,rbot-ohms' ]
+  adi,rbot-ohms: [ 'adi,rtop-ohms' ]
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: regulator.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,max77831
+
+    then:
+      properties:
+        adi,switch-frequency-hz:
+          items:
+            enum: [1200000, 1500000, 1800000]
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@66 {
+            reg = <0x66>;
+            compatible = "adi,max77857";
+            interrupt-parent = <&gpio>;
+            interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
+
+            adi,rtop-ohms = <312000>;
+            adi,rbot-ohms = <12000>;
+        };
+    };