dt-bindings: regulator: Add ADI LT8722 support

Add documentation for devicetree bindings for LT8722.

Signed-off-by: Ramon Cristopher M. Calam <[email protected]>

Author: rccalam

Diff for: Documentation/devicetree/bindings/regulator/adi,lt8722-regulator.yaml

@@ -0,0 +1,146 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2023 Analog Devices, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/adi,lt8722-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LT8722 Ultracompact Full Bridge Driver
+
+maintainers:
+  - Ramon Cristopher Calam <[email protected]>
+
+description: |
+  The Analog Devices LT8722 is a high performance, high efficiency, 15V input,
+  4A monolithic full bridge DC/DC converter. This converter has 92.5% efficiency
+  with high power output of 54W for fine control TEC driving applications.
+
+properties:
+  compatible:
+    enum:
+      - adi,lt8722
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    description: |
+      This pin in used together with the ENABLE_REQ bit in the SPIS_COMMAND
+      register to set the state of LT8722. When both the ENABLE_REQ bit and
+      the enable GPIO are low, LT8722 is in shutdown mode. When either the
+      ENABLE_REQ bit or the enable GPIO is high, LT8722 is active and the
+      internal VCC LDO regulator is enabled. The enable GPIO is active high.
+    maxItems: 1
+
+  switch-enable-gpios:
+    description: |
+      This pin is used together with the SWEN_REG bit in the SPIS_COMMAND
+      register to set the PWM switching behavior of LT8722. When both the
+      SWEN_REG bit and the switch enable GPIO are low, LT8722 PWM switching
+      is disabled. When both the SWEN_REG bit and the switch enable GPIO are
+      high, LT8722 PWM switching is enabled. The switch enable GPIO is active
+      high.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 10000000
+
+  adi,uv-clamp-microvolt:
+    description: Maximum negative output voltage clamp in microvolts.
+    minimum: 1250000
+    maximum: 20000000
+    default: 20000000
+
+  adi,ov-clamp-microvolt:
+    description: Maximum positive output voltage clamp in microvolts.
+    minimum: 1250000
+    maximum: 20000000
+    default: 20000000
+
+  adi,ilimn-microamp:
+    description: Maximum negative output current limit in microamps.
+    minimum: 637440
+    maximum: 6786000
+    default: 6786000
+
+  adi,ilimp-microamp:
+    description: Maximum positive output current limit in microamps.
+    minimum: 637440
+    maximum: 6800000
+    default: 6800000
+
+  adi,switch-frequency-hz:
+    description: PWM switch frequency.
+    enum: [500000, 1000000, 1500000, 2000000, 2500000, 3000000]
+    default: 500000
+
+  adi,switch-frequency-adjust:
+    description: PWM switch frequency adjustment.
+    enum: [0%, 15%, -15%]
+    default: 0%
+
+  adi,duty-cycle-range:
+    description: PWM duty cycle.
+    enum: [20%-80%, 15%-85%, 10%-90%]
+    default: 20%-80%
+
+  adi,vcc-vreg-millivolt:
+    description: VCC LCO regulation voltage in millivolts.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [3100, 3400]
+    default: 3400
+
+  adi,peak-inductor-current-milliamp:
+    description: Typical peak inductor current in milliamps.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [252, 594, 936, 1278, 1620, 1962, 2304, 2646]
+    default: 1620
+
+  adi,power-limit-milliwatt:
+    description: Linear power stage MOSFET power limit in milliwatts.
+    enum: [0, 2000, 3000, 3500]
+    default: 0
+
+required:
+  - compatible
+  - reg
+  - enable-gpios
+  - switch-enable-gpios
+
+allOf:
+  - $ref: regulator.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@0 {
+            compatible = "adi,lt8722";
+            reg = <0>;
+            enable-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
+            switch-enable-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
+            spi-max-frequency = <10000000>;
+            spi-bits-per-word = <8>;
+
+            adi,uv-clamp-microvolt = <20000000>;
+            adi,ov-clamp-microvolt = <20000000>;
+            adi,ilimn-microamp = <6786000>;
+            adi,ilimp-microamp = <6800000>;
+            adi,switch-frequency-hz = <500000>;
+            adi,switch-frequency-adjust = "0%";
+            adi,duty-cycle-range = "20%-80%";
+            adi,vcc-vreg-millivolt = <3400>;
+            adi,peak-inductor-current-milliamp = <1620>;
+            adi,power-limit-milliwatt = <0>;
+
+            regulator-min-microvolt = <0>;
+            regulator-max-microvolt = <20000000>;
+            regulator-soft-start;
+        };
+    };