dt-bindings: regulator: sprd,sc2731-regulator: convert to YAML

Convert the Spreadtrum SC2731 regulator bindings to DT schema.

Change during conversion:
- switch compatible from sprd,sc27xx-regulator to sprd,sc2731-regulator,
same as the only in-tree user has done back in 2019 [1]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/sprd/sc2731.dtsi?h=v6.9&id=0419a75b1808dda225b17ba1509f195f23c0db88

Signed-off-by: Stanislav Jakubek <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/ZobxoobZvA8k3pyi@standask-GA-A55M-S2HP
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/regulator/sprd,sc2731-regulator.txt

···
-Spreadtrum SC2731 Voltage regulators
-
-The SC2731 integrates low-voltage and low quiescent current DCDC/LDO.
-14 LDO and 3 DCDCs are designed for external use. All DCDCs/LDOs have
-their own bypass (power-down) control signals. External tantalum or MLCC
-ceramic capacitors are recommended to use with these LDOs.
-
-Required properties:
- - compatible: should be "sprd,sc27xx-regulator".
-
-List of regulators provided by this controller. It is named according to
-its regulator type, BUCK_<name> and LDO_<name>. The definition for each
-of these nodes is defined using the standard binding for regulators at
-Documentation/devicetree/bindings/regulator/regulator.txt.
-
-The valid names for regulators are:
-BUCK:
-	BUCK_CPU0, BUCK_CPU1, BUCK_RF
-LDO:
-	LDO_CAMA0, LDO_CAMA1, LDO_CAMMOT, LDO_VLDO, LDO_EMMCCORE, LDO_SDCORE,
-	LDO_SDIO, LDO_WIFIPA, LDO_USB33, LDO_CAMD0, LDO_CAMD1, LDO_CON,
-	LDO_CAMIO, LDO_SRAM
-
-Example:
-	regulators {
-		compatible = "sprd,sc27xx-regulator";
-
-		vddarm0: BUCK_CPU0 {
-			regulator-name = "vddarm0";
-			regulator-min-microvolt = <400000>;
-			regulator-max-microvolt = <1996875>;
-			regulator-ramp-delay = <25000>;
-			regulator-always-on;
-		};
-
-		vddcama0: LDO_CAMA0 {
-			regulator-name = "vddcama0";
-			regulator-min-microvolt = <1200000>;
-			regulator-max-microvolt = <3750000>;
-			regulator-enable-ramp-delay = <100>;
-		};
-		...
-	};

Documentation/devicetree/bindings/regulator/sprd,sc2731-regulator.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/sprd,sc2731-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Spreadtrum SC2731 Power Management IC regulators
+
+maintainers:
+  - Orson Zhai <[e-mail]>
+  - Baolin Wang <[e-mail]>
+  - Chunyan Zhang <[e-mail]>
+
+description: |
+  The SC2731 integrates low-voltage and low quiescent current DCDC/LDO.
+  14 LDO and 3 DCDCs are designed for external use. All DCDCs/LDOs have
+  their own bypass (power-down) control signals. It is recommended to use
+  external tantalum or MLCC ceramic capacitors with these LDOs.
+  Valid names for the regulators are:
+    BUCK:
+      BUCK_CPU0, BUCK_CPU1, BUCK_RF
+    LDO:
+      LDO_CAMA0, LDO_CAMA1, LDO_CAMD0, LDO_CAMD1, LDO_CAMIO, LDO_CAMMOT,
+      LDO_CON, LDO_EMMCCORE, LDO_SDCORE, LDO_SDIO, LDO_SRAM, LDO_USB33,
+      LDO_VLDO, LDO_WIFIPA
+
+properties:
+  compatible:
+    const: sprd,sc2731-regulator
+
+patternProperties:
+  "^BUCK_(CPU[0-1]|RF)$":
+    type: object
+    $ref: regulator.yaml#
+    unevaluatedProperties: false
+
+  "^LDO_(CAM(A0|A1|D0|D1|IO|MOT)|CON|EMMCCORE|SD(CORE|IO)|SRAM|USB33|VLDO|WIFIPA)$":
+    type: object
+    $ref: regulator.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    regulators {
+      compatible = "sprd,sc2731-regulator";
+
+      BUCK_CPU0 {
+        regulator-name = "vddarm0";
+        regulator-min-microvolt = <400000>;
+        regulator-max-microvolt = <1996875>;
+        regulator-ramp-delay = <25000>;
+        regulator-always-on;
+      };
+
+      LDO_CAMA0 {
+        regulator-name = "vddcama0";
+        regulator-min-microvolt = <1200000>;
+        regulator-max-microvolt = <3750000>;
+        regulator-enable-ramp-delay = <100>;
+      };
+    };
+...