regulator: dt-bindings: maxim,max8973: convert to dtschema

Convert the Maxim MAX8973 regulator to DT schema format.  Extend the
examples with more advanced one for MAX77621 copied from kernel's
nvidia/tegra210-smaug.dts, licensed under GPL-2.0.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Message-Id: <20211008114755.148279-1-krzysztof.kozlowski@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/max8973-regulator.txt

-* Maxim MAX8973 Voltage Regulator
-
-Required properties:
-
-- compatible:	must be one of following:
-			"maxim,max8973"
-			"maxim,max77621".
-- reg:		the i2c slave address of the regulator. It should be 0x1b.
-
-Any standard regulator properties can be used to configure the single max8973
-DCDC.
-
-Optional properties:
-
--maxim,externally-enable: boolean, externally control the regulator output
-		enable/disable.
--maxim,enable-gpio: GPIO for enable control. If the valid GPIO is provided
-		then externally enable control will be considered.
--maxim,dvs-gpio: GPIO which is connected to DVS pin of device.
--maxim,dvs-default-state: Default state of GPIO during initialisation.
-		1 for HIGH and 0 for LOW.
--maxim,enable-remote-sense: boolean, enable reote sense.
--maxim,enable-falling-slew-rate: boolean, enable falling slew rate.
--maxim,enable-active-discharge: boolean: enable active discharge.
--maxim,enable-frequency-shift: boolean, enable 9% frequency shift.
--maxim,enable-bias-control: boolean, enable bias control. By enabling this
-		startup delay can be reduce to 20us from 220us.
--maxim,enable-etr: boolean, enable Enhanced Transient Response.
--maxim,enable-high-etr-sensitivity: boolean, Enhanced transient response
-		circuit is enabled and set for high sensitivity. If this
-		property is available then etr will be enable default.
-
-Enhanced transient response (ETR) will affect the configuration of CKADV.
-
--junction-warn-millicelsius: u32, junction warning temperature threshold
-		in millicelsius. If die temperature crosses this level then
-		device generates the warning interrupts.
-
-Please note that thermal functionality is only supported on MAX77621. The
-supported threshold warning temperature for MAX77621 are 120 degC and 140 degC.
-
-Example:
-
-	max8973@1b {
-		compatible = "maxim,max8973";
-		reg = <0x1b>;
-
-		regulator-min-microvolt = <935000>;
-		regulator-max-microvolt = <1200000>;
-		regulator-boot-on;
-		regulator-always-on;
-	};

Documentation/devicetree/bindings/regulator/maxim,max8973.yaml

+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/maxim,max8973.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX8973/MAX77621 voltage regulator
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+allOf:
+  - $ref: regulator.yaml#
+
+properties:
+  compatible:
+    enum:
+      - maxim,max8973
+      - maxim,max77621
+
+  junction-warn-millicelsius:
+    description: |
+      Junction warning temperature threshold in millicelsius. If die
+      temperature crosses this level then device generates the warning
+      interrupts.
+      Please note that thermal functionality is only supported on MAX77621. The
+      supported threshold warning temperature for MAX77621 are 120 degC and 140
+      degC.
+
+  maxim,dvs-gpio:
+    maxItems: 1
+    description: |
+      GPIO which is connected to DVS pin of device.
+
+  maxim,dvs-default-state:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    description: |
+      Default state of GPIO during initialisation.
+      1 for HIGH and 0 for LOW.
+
+  maxim,externally-enable:
+    type: boolean
+    description: |
+      Externally control the regulator output enable/disable.
+
+  maxim,enable-gpio:
+    maxItems: 1
+    description: |
+      GPIO for enable control. If the valid GPIO is provided then externally
+      enable control will be considered.
+
+  maxim,enable-remote-sense:
+    type: boolean
+    description: Enable remote sense.
+
+  maxim,enable-falling-slew-rate:
+    type: boolean
+    description: Enable falling slew rate.
+
+  maxim,enable-active-discharge:
+    type: boolean
+    description: Eable active discharge.
+
+  maxim,enable-frequency-shift:
+    type: boolean
+    description: Enable 9% frequency shift.
+
+  maxim,enable-bias-control:
+    type: boolean
+    description: |
+      Enable bias control which can reduce the startup delay to 20us from 220us.
+
+  maxim,enable-etr:
+    type: boolean
+    description: Enable Enhanced Transient Response.
+
+  maxim,enable-high-etr-sensitivity:
+    type: boolean
+    description: |
+      Enhanced transient response circuit is enabled and set for high
+      sensitivity. If this property is available then etr will be enable
+      default.
+      Enhanced transient response (ETR) will affect the configuration of CKADV.
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@1b {
+            compatible = "maxim,max8973";
+            reg = <0x1b>;
+
+            regulator-min-microvolt = <935000>;
+            regulator-max-microvolt = <1200000>;
+            regulator-boot-on;
+            regulator-always-on;
+        };
+    };
+
+  - |
+    #include <dt-bindings/gpio/tegra-gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@1b {
+            compatible = "maxim,max77621";
+            reg = <0x1b>;
+            interrupt-parent = <&gpio>;
+            interrupts = <TEGRA_GPIO(Y, 1) IRQ_TYPE_LEVEL_LOW>;
+
+            regulator-always-on;
+            regulator-boot-on;
+            regulator-min-microvolt = <800000>;
+            regulator-max-microvolt = <1231250>;
+            regulator-name = "PPVAR_CPU";
+            regulator-ramp-delay = <12500>;
+            maxim,dvs-default-state = <1>;
+            maxim,enable-active-discharge;
+            maxim,enable-bias-control;
+            maxim,enable-etr;
+            maxim,enable-gpio = <&pmic 5 GPIO_ACTIVE_HIGH>;
+            maxim,externally-enable;
+        };
+    };