regulator: dt-bindings: maxim,max8997: convert to dtschema

Convert the Maxim MAX8997 PMIC bindings to DT schema format.  Extend the
examples with additional one copied from kernel's exynos4210-origen.dts.
Also the binding descriptions are copied from old file, so license
entire work under GPL-2.0.

This also adds previously undocumented 32 kHz clock output modelled as
regulators.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211001130249.80405-1-krzysztof.kozlowski@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/max8997-regulator.txt

-* Maxim MAX8997 Voltage and Current Regulator
-
-The Maxim MAX8997 is a multi-function device which includes voltage and
-current regulators, rtc, charger controller and other sub-blocks. It is
-interfaced to the host controller using a i2c interface. Each sub-block is
-addressed by the host system using different i2c slave address. This document
-describes the bindings for 'pmic' sub-block of max8997.
-
-Required properties:
-- compatible: Should be "maxim,max8997-pmic".
-- reg: Specifies the i2c slave address of the pmic block. It should be 0x66.
-
-- max8997,pmic-buck1-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
-  units for buck1 when changing voltage using gpio dvs. Refer to [1] below
-  for additional information.
-
-- max8997,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
-  units for buck2 when changing voltage using gpio dvs. Refer to [1] below
-  for additional information.
-
-- max8997,pmic-buck5-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
-  units for buck5 when changing voltage using gpio dvs. Refer to [1] below
-  for additional information.
-
-[1] If none of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
-    property is specified, the 'max8997,pmic-buck[1/2/5]-dvs-voltage'
-    property should specify atleast one voltage level (which would be a
-    safe operating voltage).
-
-    If either of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
-    property is specified, then all the eight voltage values for the
-    'max8997,pmic-buck[1/2/5]-dvs-voltage' should be specified.
-
-Optional properties:
-- interrupts: Interrupt specifiers for two interrupt sources.
-  - First interrupt specifier is for 'irq1' interrupt.
-  - Second interrupt specifier is for 'alert' interrupt.
-- charger-supply: regulator node for charging current.
-- max8997,pmic-buck1-uses-gpio-dvs: 'buck1' can be controlled by gpio dvs.
-- max8997,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs.
-- max8997,pmic-buck5-uses-gpio-dvs: 'buck5' can be controlled by gpio dvs.
-
-Additional properties required if either of the optional properties are used:
-- max8997,pmic-ignore-gpiodvs-side-effect: When GPIO-DVS mode is used for
-  multiple bucks, changing the voltage value of one of the bucks may affect
-  that of another buck, which is the side effect of the change (set_voltage).
-  Use this property to ignore such side effects and change the voltage.
-
-- max8997,pmic-buck125-default-dvs-idx: Default voltage setting selected from
-  the possible 8 options selectable by the dvs gpios. The value of this
-  property should be between 0 and 7. If not specified or if out of range, the
-  default value of this property is set to 0.
-
-- max8997,pmic-buck125-dvs-gpios: GPIO specifiers for three host gpio's used
-  for dvs. The format of the gpio specifier depends in the gpio controller.
-
-Regulators: The regulators of max8997 that have to be instantiated should be
-included in a sub-node named 'regulators'. Regulator nodes included in this
-sub-node should be of the format as listed below.
-
-	regulator_name {
-		standard regulator bindings here
-	};
-
-The following are the names of the regulators that the max8997 pmic block
-supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
-as per the datasheet of max8997.
-
-	- LDOn
-		  - valid values for n are 1 to 18 and 21
-		  - Example: LDO0, LD01, LDO2, LDO21
-	- BUCKn
-		  - valid values for n are 1 to 7.
-		  - Example: BUCK1, BUCK2, BUCK3, BUCK7
-
-	- ENVICHG: Battery Charging Current Monitor Output. This is a fixed
-		   voltage type regulator
-
-	- ESAFEOUT1: (ldo19)
-	- ESAFEOUT2: (ld020)
-
-	- CHARGER_CV: main battery charger voltage control
-	- CHARGER: main battery charger current control
-	- CHARGER_TOPOFF: end of charge current threshold level
-
-The bindings inside the regulator nodes use the standard regulator bindings
-which are documented elsewhere.
-
-Example:
-
-	max8997_pmic@66 {
-		compatible = "maxim,max8997-pmic";
-		interrupt-parent = <&wakeup_eint>;
-		reg = <0x66>;
-		interrupts = <4 0>, <3 0>;
-
-		max8997,pmic-buck1-uses-gpio-dvs;
-		max8997,pmic-buck2-uses-gpio-dvs;
-		max8997,pmic-buck5-uses-gpio-dvs;
-
-		max8997,pmic-ignore-gpiodvs-side-effect;
-		max8997,pmic-buck125-default-dvs-idx = <0>;
-
-		max8997,pmic-buck125-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */
-						 <&gpx0 1 1 0 0>, /* SET2 */
-						 <&gpx0 2 1 0 0>; /* SET3 */
-
-		max8997,pmic-buck1-dvs-voltage = <1350000>, <1300000>,
-						 <1250000>, <1200000>,
-						 <1150000>, <1100000>,
-						 <1000000>, <950000>;
-
-		max8997,pmic-buck2-dvs-voltage = <1100000>, <1100000>,
-						 <1100000>, <1100000>,
-						 <1000000>, <1000000>,
-						 <1000000>, <1000000>;
-
-		max8997,pmic-buck5-dvs-voltage = <1200000>, <1200000>,
-						 <1200000>, <1200000>,
-						 <1200000>, <1200000>,
-						 <1200000>, <1200000>;
-
-		regulators {
-			ldo1_reg: LDO1 {
-				regulator-name = "VDD_ABB_3.3V";
-				regulator-min-microvolt = <3300000>;
-				regulator-max-microvolt = <3300000>;
-			};
-
-			ldo2_reg: LDO2 {
-				regulator-name = "VDD_ALIVE_1.1V";
-				regulator-min-microvolt = <1100000>;
-				regulator-max-microvolt = <1100000>;
-				regulator-always-on;
-			};
-
-			buck1_reg: BUCK1 {
-				regulator-name = "VDD_ARM_1.2V";
-				regulator-min-microvolt = <950000>;
-				regulator-max-microvolt = <1350000>;
-				regulator-always-on;
-				regulator-boot-on;
-			};
-		};
-	};