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