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145 lines
5.2 KiB
145 lines
5.2 KiB
* 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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- charger-supply: regulator node for charging current. |
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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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