regulator: Add bindings for MT6332 regulator

Add devicetree bindings for the regulators found in the MT6332 PMIC.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220913123456.384513-4-angelogioacchino.delregno@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/mediatek,mt6332-regulator.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/mediatek,mt6332-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MT6332 Regulator from MediaTek Integrated
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+
+description: |
+  The MT6332 Companion PMIC provides 6 BUCK and 4 LDO (Low Dropout)
+  regulators and nodes are named according to the regulator type:
+  buck-<name> and ldo-<name>.
+  MT6332 regulators node should be sub node of the MT6397 MFD node.
+
+patternProperties:
+  "^buck-v(dram|dvfs2|pa|rf18a|rf18b|sbst)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^v(dram|dvfs2|pa|rf18a|rf18b|sbst)$"
+
+    unevaluatedProperties: false
+
+  "^ldo-v(bif28|dig18|sram|usb33)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^v(bif28|dig18|sram|usb33)$"
+
+    unevaluatedProperties: false
+
+additionalProperties: false
+
+examples:
+  - |
+    pmic {
+      regulators {
+        mt6332_vdram_reg: buck-vdram {
+          regulator-name = "vdram";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-allowed-modes = <0 1>;
+          regulator-always-on;
+        };
+        mt6332_vdvfs2_reg: buck-vdvfs2 {
+          regulator-name = "vdvfs2";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1312500>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6332_vpa_reg: buck-vpa {
+          regulator-name = "vpa";
+          regulator-min-microvolt = <500000>;
+          regulator-max-microvolt = <3400000>;
+        };
+        mt6332_vrf18a_reg: buck-vrf18a {
+          regulator-name = "vrf18a";
+          regulator-min-microvolt = <1050000>;
+          regulator-max-microvolt = <2240625>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6332_vrf18b_reg: buck-vrf18b {
+          regulator-name = "vrf18b";
+          regulator-min-microvolt = <1050000>;
+          regulator-max-microvolt = <2240625>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6332_vsbst_reg: buck-vsbst {
+          regulator-name = "vsbst";
+          regulator-min-microvolt = <3500000>;
+          regulator-max-microvolt = <7468750>;
+        };
+        mt6332_vauxb32_reg: ldo-vauxb32 {
+          regulator-name = "vauxb32";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <3200000>;
+        };
+        mt6332_vbif28_reg: ldo-vbif28 {
+          regulator-name = "vbif28";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <2800000>;
+        };
+        mt6332_vdig18_reg: ldo-vdig18 {
+          regulator-name = "vdig18";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <1800000>;
+          regulator-always-on;
+        };
+        mt6332_vsram_reg: ldo-vsram {
+          regulator-name = "vauxa32";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-always-on;
+        };
+        mt6332_vusb33_reg: ldo-vusb33 {
+          regulator-name = "vusb33";
+          regulator-min-microvolt = <3300000>;
+          regulator-max-microvolt = <3300000>;
+        };
+      };
+    };
+...