mirror of https://gitee.com/openkylin/linux.git
146 lines
5.2 KiB
Plaintext
146 lines
5.2 KiB
Plaintext
* 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;
|
|
};
|
|
};
|
|
};
|