regulator: Add bindings for Richtek RT5190A PMIC

Add bindings for Richtek RT5190A PMIC.
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/1646812903-32496-2-git-send-email-u0084500@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/richtek,rt5190a-regulator.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/richtek,rt5190a-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT5190A PMIC Regulator
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description: |
+  The RT5190A integrates 1 channel buck controller, 3 channels high efficiency
+  synchronous buck converters, 1 LDO, I2C control interface and peripherial
+  logical control.
+
+  It also supports mute AC OFF depop sound and quick setting storage while
+  input power is removed.
+
+properties:
+  compatible:
+    enum:
+      - richtek,rt5190a
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vin2-supply:
+    description: phandle to buck2 input voltage.
+
+  vin3-supply:
+    description: phandle to buck3 input voltage.
+
+  vin4-supply:
+    description: phandle to buck4 input voltage.
+
+  vinldo-supply:
+    description: phandle to ldo input voltage
+
+  richtek,mute-enable:
+    description: |
+      The mute function uses 'mutein', 'muteout', and 'vdet' pins as the control
+      signal. When enabled, The normal behavior is to bypass the 'mutein' signal
+      'muteout'. But if the power source removal is detected from 'vdet',
+      whatever the 'mutein' signal is, it will pull down the 'muteout' to force
+      speakers mute. this function is commonly used to prevent the speaker pop
+      noise during AC power turned off in the modern TV system design.
+    type: boolean
+
+  regulators:
+    type: object
+
+    patternProperties:
+      "^buck[1-4]$|^ldo$":
+        type: object
+        $ref: regulator.yaml#
+        description: |
+          regulator description for buck1 and buck4.
+
+        properties:
+          regulator-allowed-modes:
+            description: |
+             buck operating mode, only buck1/4 support mode operating.
+              0: auto mode
+              1: force pwm mode
+            items:
+              enum: [0, 1]
+
+          richtek,latchup-enable:
+            type: boolean
+            description: |
+              If specified, undervolt protection mode changes from the default
+              hiccup to latchup.
+
+        unevaluatedProperties: false
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - regulators
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/regulator/richtek,rt5190a-regulator.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      pmic@64 {
+        compatible = "richtek,rt5190a";
+        reg = <0x64>;
+        interrupts-extended = <&gpio26 0 IRQ_TYPE_LEVEL_LOW>;
+        vin2-supply = <&rt5190_buck1>;
+        vin3-supply = <&rt5190_buck1>;
+        vin4-supply = <&rt5190_buck1>;
+
+        regulators {
+          rt5190_buck1: buck1 {
+            regulator-name = "rt5190a-buck1";
+            regulator-min-microvolt = <5090000>;
+            regulator-max-microvolt = <5090000>;
+            regulator-allowed-modes = <RT5190A_OPMODE_AUTO RT5190A_OPMODE_FPWM>;
+            regulator-boot-on;
+          };
+          buck2 {
+            regulator-name = "rt5190a-buck2";
+            regulator-min-microvolt = <600000>;
+            regulator-max-microvolt = <1400000>;
+            regulator-boot-on;
+          };
+          buck3 {
+            regulator-name = "rt5190a-buck3";
+            regulator-min-microvolt = <600000>;
+            regulator-max-microvolt = <1400000>;
+            regulator-boot-on;
+          };
+          buck4 {
+            regulator-name = "rt5190a-buck4";
+            regulator-min-microvolt = <850000>;
+            regulator-max-microvolt = <850000>;
+            regulator-allowed-modes = <RT5190A_OPMODE_AUTO RT5190A_OPMODE_FPWM>;
+            regulator-boot-on;
+          };
+          ldo {
+            regulator-name = "rt5190a-ldo";
+            regulator-min-microvolt = <1200000>;
+            regulator-max-microvolt = <1200000>;
+            regulator-boot-on;
+          };
+        };
+      };
+    };

include/dt-bindings/regulator/richtek,rt5190a-regulator.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __DT_BINDINGS_RICHTEK_RT5190A_REGULATOR_H__
+#define __DT_BINDINGS_RICHTEK_RT5190A_REGULATOR_H__
+
+/*
+ * BUCK/LDO mode constants which may be used in devicetree properties
+ * (eg. regulator-allowed-modes).
+ * See the manufacturer's datasheet for more information on these modes.
+ */
+
+#define RT5190A_OPMODE_AUTO	0
+#define RT5190A_OPMODE_FPWM	1
+
+#endif