regulator: Add bindings for MT6331 regulator

Add the bindings for the regulators found in the MT6331 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/20220913123456.384513-2-angelogioacchino.delregno@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/mediatek,mt6331-regulator.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/mediatek,mt6331-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MT6331 Regulator from MediaTek Integrated
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+
+description: |
+  The MT6331 PMIC provides 6 BUCK and 21 LDO (Low Dropout) regulators
+  and nodes are named according to the regulator type:
+  buck-<name> and ldo-<name>.
+  MT6331 regulators node should be sub node of the MT6397 MFD node.
+
+patternProperties:
+  "^buck-v(core2|io18|dvfs11|dvfs12|dvfs13|dvfs14)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^v(core2|io18|dvfs11|dvfs12|dvfs13|dvfs14)$"
+
+    unevaluatedProperties: false
+
+  "^ldo-v(avdd32aud|auxa32)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^v(avdd32aud|auxa32)$"
+
+    unevaluatedProperties: false
+
+  "^ldo-v(dig18|emc33|ibr|mc|mch|mipi|rtc|sram|usb10)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^v(dig18|emc33|ibr|mc|mch|mipi|rtc|sram|usb10)$"
+
+    unevaluatedProperties: false
+
+  "^ldo-vcam(a|af|d|io)$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^vcam(a|af|d|io)$"
+
+    unevaluatedProperties: false
+
+  "^ldo-vtcxo[12]$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^vtcxo[12]$"
+
+    required:
+      - regulator-name
+
+    unevaluatedProperties: false
+
+  "^ldo-vgp[1234]$":
+    type: object
+    $ref: "regulator.yaml#"
+
+    properties:
+      regulator-name:
+        pattern: "^vgp[12]$"
+
+    required:
+      - regulator-name
+
+    unevaluatedProperties: false
+
+additionalProperties: false
+
+examples:
+  - |
+    pmic {
+      regulators {
+        mt6331_vdvfs11_reg: buck-vdvfs11 {
+          regulator-name = "vdvfs11";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vdvfs12_reg: buck-vdvfs12 {
+          regulator-name = "vdvfs12";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vdvfs13_reg: buck-vdvfs13 {
+          regulator-name = "vdvfs13";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vdvfs14_reg: buck-vdvfs14 {
+          regulator-name = "vdvfs14";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vcore2_reg: buck-vcore2 {
+          regulator-name = "vcore2";
+          regulator-min-microvolt = <700000>;
+          regulator-max-microvolt = <1493750>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <1>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vio18_reg: buck-vio18 {
+          regulator-name = "vio18";
+          regulator-min-microvolt = <1800000>;
+          regulator-max-microvolt = <1800000>;
+          regulator-ramp-delay = <12500>;
+          regulator-enable-ramp-delay = <0>;
+          regulator-allowed-modes = <0 1>;
+        };
+        mt6331_vtcxo1_reg: ldo-vtcxo1 {
+          regulator-name = "vtcxo1";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <2800000>;
+          regulator-always-on;
+          regulator-boot-on;
+        };
+        mt6331_vtcxo2_reg: ldo-vtcxo2 {
+          regulator-name = "vtcxo2";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <2800000>;
+          regulator-always-on;
+          regulator-boot-on;
+        };
+        mt6331_avdd32_aud_reg: ldo-avdd32aud {
+          regulator-name = "avdd32_aud";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <3200000>;
+        };
+        mt6331_vauxa32_reg: ldo-vauxa32 {
+          regulator-name = "vauxa32";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <3200000>;
+        };
+        mt6331_vcama_reg: ldo-vcama {
+          regulator-name = "vcama";
+          regulator-min-microvolt = <1500000>;
+          regulator-max-microvolt = <2800000>;
+          regulator-always-on;
+        };
+        mt6331_vio28_reg: ldo-vio28 {
+          regulator-name = "vio28";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <2800000>;
+          regulator-always-on;
+          regulator-boot-on;
+        };
+        mt6331_vcamaf_reg: ldo-vcamaf {
+          regulator-name = "vcam_af";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vmc_reg: ldo-vmc {
+          regulator-name = "vmc";
+          regulator-min-microvolt = <1800000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vmch_reg: ldo-vmch {
+          regulator-name = "vmch";
+          regulator-min-microvolt = <3000000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vemc33_reg: ldo-vemc33 {
+          regulator-name = "vemc33";
+          regulator-min-microvolt = <3300000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vgp1_reg: ldo-vgp1 {
+          regulator-name = "vgp1";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vsim1_reg: ldo-vsim1 {
+          regulator-name = "vsim1";
+          regulator-min-microvolt = <1700000>;
+          regulator-max-microvolt = <3100000>;
+        };
+        mt6331_vsim2_reg: ldo-vsim2 {
+          regulator-name = "vsim2";
+          regulator-min-microvolt = <1700000>;
+          regulator-max-microvolt = <3100000>;
+        };
+        mt6331_vmipi_reg: ldo-vmipi {
+          regulator-name = "vmipi";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vibr_reg: ldo-vibr {
+          regulator-name = "vibr";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <3300000>;
+        };
+        mt6331_vgp4_reg: ldo-vgp4 {
+          regulator-name = "vgp4";
+          regulator-min-microvolt = <1600000>;
+          regulator-max-microvolt = <2200000>;
+        };
+        mt6331_vcamd_reg: ldo-vcamd {
+          regulator-name = "vcamd";
+          regulator-min-microvolt = <900000>;
+          regulator-max-microvolt = <1500000>;
+        };
+        mt6331_vusb10_reg: ldo-vusb10 {
+          regulator-name = "vusb";
+          regulator-min-microvolt = <1000000>;
+          regulator-max-microvolt = <1300000>;
+          regulator-boot-on;
+        };
+        mt6331_vcamio_reg: ldo-vcamio {
+          regulator-name = "vcam_io";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <1800000>;
+        };
+        mt6331_vsram_reg: ldo-vsram {
+          regulator-name = "vsram";
+          regulator-min-microvolt = <1012500>;
+          regulator-max-microvolt = <1012500>;
+          regulator-always-on;
+          regulator-boot-on;
+        };
+        mt6331_vgp2_reg: ldo-vgp2 {
+          regulator-name = "vgp2";
+          regulator-min-microvolt = <1100000>;
+          regulator-max-microvolt = <1500000>;
+          regulator-boot-on;
+        };
+        mt6331_vgp3_reg: ldo-vgp3 {
+          regulator-name = "vgp3";
+          regulator-min-microvolt = <1200000>;
+          regulator-max-microvolt = <1800000>;
+        };
+        mt6331_vrtc_reg: ldo-vrtc {
+          regulator-name = "vrtc";
+          regulator-min-microvolt = <2800000>;
+          regulator-max-microvolt = <2800000>;
+          regulator-always-on;
+        };
+        mt6331_vdig18_reg: ldo-vdig18 {
+          regulator-name = "dvdd18_dig";
+          regulator-min-microvolt = <1800000>;
+          regulator-max-microvolt = <1800000>;
+        };
+      };
+    };
+...