dt-bindings: mfd: samsung,s2mpa01: Convert to dtschema

Convert the MFD part of Samsung S2MPA01 PMIC to DT schema format.
Previously the bindings were mostly in mfd/samsung,sec-core.txt.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211008113931.134847-5-krzysztof.kozlowski@canonical.com

Documentation/devicetree/bindings/mfd/samsung,s2mpa01.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/samsung,s2mpa01.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung S2MPA01 Power Management IC
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+description: |
+  This is a part of device tree bindings for S2M and S5M family of Power
+  Management IC (PMIC).
+
+  The Samsung S2MPA01 is a Power Management IC which includes voltage
+  and current regulators, RTC, clock outputs and other sub-blocks.
+
+properties:
+  compatible:
+    const: samsung,s2mpa01-pmic
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  regulators:
+    $ref: ../regulator/samsung,s2mpa01.yaml
+    description:
+      List of child nodes that specify the regulators.
+
+  wakeup-source: true
+
+required:
+  - compatible
+  - reg
+  - regulators
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pmic@66 {
+            compatible = "samsung,s2mpa01-pmic";
+            reg = <0x66>;
+
+            regulators {
+                ldo1_reg: LDO1 {
+                    regulator-name = "VDD_ALIVE";
+                    regulator-min-microvolt = <1000000>;
+                    regulator-max-microvolt = <1000000>;
+                };
+
+                ldo2_reg: LDO2 {
+                    regulator-name = "VDDQ_MMC2";
+                    regulator-min-microvolt = <2800000>;
+                    regulator-max-microvolt = <2800000>;
+                    regulator-always-on;
+                };
+
+                // ...
+
+                buck1_reg: BUCK1 {
+                    regulator-name = "vdd_mif";
+                    regulator-min-microvolt = <950000>;
+                    regulator-max-microvolt = <1350000>;
+                    regulator-always-on;
+                    regulator-boot-on;
+                };
+
+                buck2_reg: BUCK2 {
+                    regulator-name = "vdd_arm";
+                    regulator-min-microvolt = <950000>;
+                    regulator-max-microvolt = <1350000>;
+                    regulator-always-on;
+                    regulator-boot-on;
+                    regulator-ramp-delay = <50000>;
+                };
+
+                // ...
+            };
+        };
+    };