126 lines
4.4 KiB
Plaintext
126 lines
4.4 KiB
Plaintext
|
* 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>;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|