112 lines
4 KiB
Plaintext
Executable file
112 lines
4 KiB
Plaintext
Executable file
Binding for Maxim MAX77802 regulators
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This is a part of device tree bindings of MAX77802 multi-function device.
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More information can be found in bindings/mfd/max77802.txt file.
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The MAX77802 PMIC has 10 high-efficiency Buck and 32 Low-dropout (LDO)
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regulators that can be controlled over I2C.
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Following properties should be present in main device node of the MFD chip.
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Optional properties:
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- inb1-supply: The input supply for BUCK1
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- inb2-supply: The input supply for BUCK2
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- inb3-supply: The input supply for BUCK3
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- inb4-supply: The input supply for BUCK4
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- inb5-supply: The input supply for BUCK5
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- inb6-supply: The input supply for BUCK6
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- inb7-supply: The input supply for BUCK7
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- inb8-supply: The input supply for BUCK8
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- inb9-supply: The input supply for BUCK9
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- inb10-supply: The input supply for BUCK10
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- inl1-supply: The input supply for LDO8 and LDO15
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- inl2-supply: The input supply for LDO17, LDO27, LDO30 and LDO35
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- inl3-supply: The input supply for LDO3, LDO5, LDO6 and LDO7
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- inl4-supply: The input supply for LDO10, LDO11, LDO13 and LDO14
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- inl5-supply: The input supply for LDO9 and LDO19
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- inl6-supply: The input supply for LDO4, LDO21, LDO24 and LDO33
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- inl7-supply: The input supply for LDO18, LDO20, LDO28 and LDO29
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- inl9-supply: The input supply for LDO12, LDO23, LDO25, LDO26, LDO32 and LDO34
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- inl10-supply: The input supply for LDO1 and LDO2
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Optional nodes:
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- regulators : The regulators of max77802 have to be instantiated
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under subnode named "regulators" using the following format.
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regulator-name {
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standard regulator constraints....
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};
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refer Documentation/devicetree/bindings/regulator/regulator.txt
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The regulator node name should be initialized with a string to get matched
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with their hardware counterparts as follow. The valid names are:
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-LDOn : for LDOs, where n can lie in ranges 1-15, 17-21, 23-30
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and 32-35.
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example: LDO1, LDO2, LDO35.
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-BUCKn : for BUCKs, where n can lie in range 1 to 10.
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example: BUCK1, BUCK5, BUCK10.
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The max77802 regulator supports two different operating modes: Normal and Low
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Power Mode. Some regulators support the modes to be changed at startup or by
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the consumers during normal operation while others only support to change the
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mode during system suspend. The standard regulator suspend states binding can
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be used to configure the regulator operating mode.
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The regulators that support the standard "regulator-initial-mode" property,
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changing their mode during normal operation are: LDOs 1, 3, 20 and 21.
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The possible values for "regulator-initial-mode" and "regulator-mode" are:
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1: Normal regulator voltage output mode.
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3: Low Power which reduces the quiescent current down to only 1uA
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The valid modes list is defined in the dt-bindings/regulator/maxim,max77802.h
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header and can be included by device tree source files.
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The standard "regulator-mode" property can only be used for regulators that
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support changing their mode to Low Power Mode during suspend. These regulators
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are: BUCKs 2-4 and LDOs 1-35. Also, it only takes effect if the regulator has
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been enabled for the given suspend state using "regulator-on-in-suspend" and
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has not been disabled for that state using "regulator-off-in-suspend".
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Example:
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max77802@9 {
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compatible = "maxim,max77802";
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interrupt-parent = <&wakeup_eint>;
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interrupts = <26 0>;
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reg = <0x09>;
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#address-cells = <1>;
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#size-cells = <0>;
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inb1-supply = <&parent_reg>;
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regulators {
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ldo1_reg: LDO1 {
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regulator-name = "vdd_1v0";
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regulator-min-microvolt = <1000000>;
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regulator-max-microvolt = <1000000>;
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regulator-always-on;
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regulator-initial-mode = <MAX77802_OPMODE_LP>;
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};
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ldo11_reg: LDO11 {
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regulator-name = "vdd_ldo11";
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regulator-min-microvolt = <1900000>;
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regulator-max-microvolt = <1900000>;
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regulator-always-on;
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regulator-state-mem {
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regulator-on-in-suspend;
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regulator-mode = <MAX77802_OPMODE_LP>;
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};
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};
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buck1_reg: BUCK1 {
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regulator-name = "vdd_mif";
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regulator-min-microvolt = <950000>;
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regulator-max-microvolt = <1300000>;
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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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