mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
4.4 KiB
125 lines
4.4 KiB
* Maxim MAX8998, National/TI LP3974 multi-function device |
|
|
|
The Maxim MAX8998 is a multi-function device which includes voltage/current |
|
regulators, real time clock, battery charging controller and several |
|
other sub-blocks. It is interfaced using an I2C interface. Each sub-block |
|
is addressed by the host system using different i2c slave address. |
|
|
|
PMIC sub-block |
|
-------------- |
|
|
|
The PMIC sub-block contains a number of voltage and current regulators, |
|
with controllable parameters and dynamic voltage scaling capability. |
|
In addition, it includes a real time clock and battery charging controller |
|
as well. It is accessible at I2C address 0x66. |
|
|
|
Required properties: |
|
- compatible: Should be one of the following: |
|
- "maxim,max8998" for Maxim MAX8998 |
|
- "national,lp3974" or "ti,lp3974" for National/TI LP3974. |
|
- reg: Specifies the i2c slave address of the pmic block. It should be 0x66. |
|
|
|
Optional properties: |
|
- interrupts: Interrupt specifiers for two interrupt sources. |
|
- First interrupt specifier is for main interrupt. |
|
- Second interrupt specifier is for power-on/-off interrupt. |
|
- max8998,pmic-buck1-dvs-gpios: GPIO specifiers for two host gpios used |
|
for buck 1 dvs. The format of the gpio specifier depends on the gpio |
|
controller. |
|
- max8998,pmic-buck2-dvs-gpio: GPIO specifier for host gpio used |
|
for buck 2 dvs. The format of the gpio specifier depends on the gpio |
|
controller. |
|
- max8998,pmic-buck1-default-dvs-idx: Default voltage setting selected from |
|
the possible 4 options selectable by the dvs gpios. The value of this |
|
property should be 0, 1, 2 or 3. If not specified or out of range, |
|
a default value of 0 is taken. |
|
- max8998,pmic-buck2-default-dvs-idx: Default voltage setting selected from |
|
the possible 2 options selectable by the dvs gpios. The value of this |
|
property should be 0 or 1. If not specified or out of range, a default |
|
value of 0 is taken. |
|
- max8998,pmic-buck-voltage-lock: If present, disallows changing of |
|
preprogrammed buck dvfs voltages. |
|
|
|
Additional properties required if max8998,pmic-buck1-dvs-gpios is defined: |
|
- max8998,pmic-buck1-dvs-voltage: An array of 4 voltage values in microvolts |
|
for buck1 regulator that can be selected using dvs gpio. |
|
|
|
Additional properties required if max8998,pmic-buck2-dvs-gpio is defined: |
|
- max8998,pmic-buck2-dvs-voltage: An array of 2 voltage values in microvolts |
|
for buck2 regulator that can be selected using dvs gpio. |
|
|
|
Regulators: All the regulators of MAX8998 to be instantiated shall be |
|
listed in a child node named 'regulators'. Each regulator is represented |
|
by a child node of the 'regulators' node. |
|
|
|
regulator-name { |
|
/* standard regulator bindings here */ |
|
}; |
|
|
|
Following regulators of the MAX8998 PMIC block are supported. Note that |
|
the 'n' in regulator name, as in LDOn or BUCKn, represents the LDO or BUCK |
|
number as described in MAX8998 datasheet. |
|
|
|
- LDOn |
|
- valid values for n are 2 to 17 |
|
- Example: LDO2, LDO10, LDO17 |
|
- BUCKn |
|
- valid values for n are 1 to 4. |
|
- Example: BUCK1, BUCK2, BUCK3, BUCK4 |
|
|
|
- ENVICHG: Battery Charging Current Monitor Output. This is a fixed |
|
voltage type regulator |
|
|
|
- ESAFEOUT1: (ldo19) |
|
- ESAFEOUT2: (ld020) |
|
|
|
- CHARGER: main battery charger current control |
|
|
|
Standard regulator bindings are used inside regulator subnodes. Check |
|
Documentation/devicetree/bindings/regulator/regulator.txt |
|
for more details. |
|
|
|
Example: |
|
|
|
pmic@66 { |
|
compatible = "maxim,max8998-pmic"; |
|
reg = <0x66>; |
|
interrupt-parent = <&wakeup_eint>; |
|
interrupts = <4 0>, <3 0>; |
|
|
|
/* Buck 1 DVS settings */ |
|
max8998,pmic-buck1-default-dvs-idx = <0>; |
|
max8998,pmic-buck1-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */ |
|
<&gpx0 1 1 0 0>; /* SET2 */ |
|
max8998,pmic-buck1-dvs-voltage = <1350000>, <1300000>, |
|
<1000000>, <950000>; |
|
|
|
/* Buck 2 DVS settings */ |
|
max8998,pmic-buck2-default-dvs-idx = <0>; |
|
max8998,pmic-buck2-dvs-gpio = <&gpx0 0 3 0 0>; /* SET3 */ |
|
max8998,pmic-buck2-dvs-voltage = <1350000>, <1300000>; |
|
|
|
/* Regulators to instantiate */ |
|
regulators { |
|
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; |
|
}; |
|
|
|
charger_reg: CHARGER { |
|
regulator-name = "CHARGER"; |
|
regulator-min-microamp = <90000>; |
|
regulator-max-microamp = <800000>; |
|
}; |
|
}; |
|
};
|
|
|