dt-bindings: regulators: Add bindings for Maxim MAX20086-MAX20089

The MAX20086-MAX20089 are dual/quad power protectors for cameras. Add
corresponding DT bindings.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220106224350.16957-2-laurent.pinchart+renesas@ideasonboard.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/maxim,max20086.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/maxim,max20086.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim Integrated MAX20086-MAX20089 Camera Power Protector
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+description: |
+  The MAX20086-MAX20089 are dual/quad camera power protectors, designed to
+  deliver power over coax for radar and camera modules. They support
+  software-configurable output switching and monitoring. The output voltage and
+  current limit are fixed by the hardware design.
+
+properties:
+  compatible:
+    enum:
+      - maxim,max20086
+      - maxim,max20087
+      - maxim,max20088
+      - maxim,max20089
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    maxItems: 1
+    description: GPIO connected to the EN pin, active high
+
+  in-supply:
+    description: Input supply for the camera outputs (IN pin, 3.0V to 15.0V)
+
+  vdd-supply:
+    description: Input supply for the device (VDD pin, 3.0V to 5.5V)
+
+  regulators:
+    type: object
+
+    patternProperties:
+      "^OUT[1-4]$":
+        type: object
+        $ref: regulator.yaml#
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - in-supply
+  - vdd-supply
+  - regulators
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - maxim,max20088
+              - maxim,max20089
+    then:
+      properties:
+        regulators:
+          properties:
+            OUT3: false
+            OUT4: false
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@28 {
+            compatible = "maxim,max20087";
+            reg = <0x28>;
+
+            in-supply = <&reg_12v0>;
+            vdd-supply = <&reg_3v3>;
+
+            enable-gpios = <&gpio 108 GPIO_ACTIVE_HIGH>;
+
+            regulators {
+                OUT1 {
+                    regulator-name = "VOUT1";
+                };
+                OUT2 {
+                    regulator-name = "VOUT2";
+                };
+                OUT3 {
+                    regulator-name = "VOUT3";
+                };
+                OUT4 {
+                    regulator-name = "VOUT4";
+                };
+            };
+        };
+    };
+...