dt-bindings: mfd: Add entry for Marvell 88PM886 PMIC

Marvell 88PM886 is a PMIC with several subdevices such as onkey,
regulators or battery and charger. It comes in at least two revisions,
A0 and A1 -- only A1 is described here at the moment.

Signed-off-by: Karel Balej <balejk@matfyz.cz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240531175109.15599-2-balejk@matfyz.cz
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/marvell,88pm886-a1.yaml

@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/marvell,88pm886-a1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell 88PM886 PMIC core
+
+maintainers:
+  - Karel Balej <balejk@matfyz.cz>
+
+description:
+  Marvell 88PM886 is a PMIC providing several functions such as onkey,
+  regulators or battery and charger.
+
+properties:
+  compatible:
+    const: marvell,88pm886-a1
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  wakeup-source: true
+
+  regulators:
+    type: object
+    additionalProperties: false
+    patternProperties:
+      "^(ldo(1[0-6]|[1-9])|buck[1-5])$":
+        type: object
+        $ref: /schemas/regulator/regulator.yaml#
+        description: LDO or buck regulator.
+        unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      pmic@30 {
+        compatible = "marvell,88pm886-a1";
+        reg = <0x30>;
+        interrupts = <0 4 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-parent = <&gic>;
+        wakeup-source;
+
+        regulators {
+          ldo2: ldo2 {
+            regulator-min-microvolt = <3100000>;
+            regulator-max-microvolt = <3300000>;
+          };
+
+          ldo15: ldo15 {
+            regulator-min-microvolt = <3300000>;
+            regulator-max-microvolt = <3300000>;
+          };
+
+          buck2: buck2 {
+            regulator-min-microvolt = <1800000>;
+            regulator-max-microvolt = <1800000>;
+          };
+        };
+      };
+    };
+...