Regulator DT binding for MAX77620 Power management IC from Maxim Semiconductor.
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Device has multiple DCDC(sd[0-3] and LDOs(ldo[0-8]). The input supply
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of these regulators are defined under parent device node.
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Details of regulator properties are defined as child node under
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sub-node "regulators" which is child node of device node.
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Please refer file <Documentation/devicetree/bindings/regulator/regulator.txt>
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for common regulator bindings used by client.
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Following are properties of parent node related to regulators.
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Optional properties:
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-------------------
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The input supply of regulators are the optional properties on the
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parent device node. The input supply of these regulators are provided
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through following properties:
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in-sd0-supply: Input supply for SD0, INA-SD0 or INB-SD0 pins.
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in-sd1-supply: Input supply for SD1.
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in-sd2-supply: Input supply for SD2.
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in-sd3-supply: Input supply for SD3.
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in-ldo0-1-supply: Input supply for LDO0 and LDO1.
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in-ldo2-supply: Input supply for LDO2.
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in-ldo3-5-supply: Input supply for LDO3 and LDO5
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in-ldo4-6-supply: Input supply for LDO4 and LDO6.
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in-ldo7-8-supply: Input supply for LDO7 and LDO8.
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Optional sub nodes for regulators under "regulators" subnode:
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------------------------------------------------------------
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The subnodes name is the name of regulator and it must be one of:
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sd[0-3], ldo[0-8]
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Each sub-node should contain the constraints and initialization
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information for that regulator. The definition for each of these
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nodes is defined using the standard binding for regulators found at
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<Documentation/devicetree/bindings/regulator/regulator.txt>.
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Theres are also additional properties for SD/LDOs. These additional properties
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are required to configure FPS configuration parameters for SDs and LDOs.
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Please refer <devicetree/bindings/mfd/max77620.txt> for more detail of Flexible
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Power Sequence (FPS).
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Following are additional properties:
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- maxim,active-fps-source: FPS source for the regulators to get
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enabled/disabled when system is in
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active state. Valid values are:
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- MAX77620_FPS_SRC_0,
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FPS source is FPS0.
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- MAX77620_FPS_SRC_1,
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FPS source is FPS1
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- MAX77620_FPS_SRC_2 and
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FPS source is FPS2
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- MAX77620_FPS_SRC_NONE.
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Regulator is not controlled
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by FPS events and it gets
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enabled/disabled by register
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access.
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Absence of this property will leave
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the FPS configuration register for that
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regulator to default configuration.
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- maxim,active-fps-power-up-slot: Sequencing event slot number on which
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the regulator get enabled when
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master FPS input event set to HIGH.
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Valid values are 0 to 7.
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This is applicable if FPS source is
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selected as FPS0, FPS1 or FPS2.
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- maxim,active-fps-power-down-slot: Sequencing event slot number on which
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the regulator get disabled when master
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FPS input event set to LOW.
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Valid values are 0 to 7.
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This is applicable if FPS source is
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selected as FPS0, FPS1 or FPS2.
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- maxim,suspend-fps-source: This is same as property
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"maxim,active-fps-source" but value
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get configured when system enters in
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to suspend state.
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- maxim,suspend-fps-power-up-slot: This is same as property
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"maxim,active-fps-power-up-slot" but
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this value get configured into FPS
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configuration register when system
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enters into suspend.
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This is applicable if suspend state
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FPS source is selected as FPS0, FPS1 or
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- maxim,suspend-fps-power-down-slot: This is same as property
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"maxim,active-fps-power-down-slot" but
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this value get configured into FPS
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configuration register when system
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enters into suspend.
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This is applicable if suspend state
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FPS source is selected as FPS0, FPS1 or
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FPS2.
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- maxim,ramp-rate-setting: integer, ramp rate(uV/us) setting to be
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configured to the device.
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The platform may have different ramp
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rate than advertised ramp rate if it has
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design variation from Maxim's
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recommended. On this case, platform
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specific ramp rate is used for ramp time
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calculation and this property is used
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for device register configurations.
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The measured ramp rate of platform is
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provided by the regulator-ramp-delay
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as described in <devicetree/bindings/
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regulator/regulator.txt>.
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Maxim Max77620 supports following ramp
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delay:
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SD: 13.75mV/us, 27.5mV/us, 55mV/us
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LDOs: 5mV/us, 100mV/us
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Note: If the measured ramp delay is same as advertised ramp delay then it is not
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required to provide the ramp delay with property "maxim,ramp-rate-setting". The
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ramp rate can be provided by the regulator-ramp-delay which will be used for
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ramp time calculation for voltage change as well as for device configuration.
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Example:
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--------
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#include <dt-bindings/mfd/max77620.h>
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...
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max77620@3c {
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in-ldo0-1-supply = <&max77620_sd2>;
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in-ldo7-8-supply = <&max77620_sd2>;
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regulators {
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sd0 {
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regulator-name = "vdd-core";
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regulator-min-microvolt = <600000>;
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regulator-max-microvolt = <1400000>;
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regulator-boot-on;
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regulator-always-on;
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maxim,active-fps-source = <MAX77620_FPS_SRC_1>;
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};
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sd1 {
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regulator-name = "vddio-ddr";
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regulator-min-microvolt = <1200000>;
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regulator-max-microvolt = <1200000>;
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regulator-always-on;
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regulator-boot-on;
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maxim,active-fps-source = <MAX77620_FPS_SRC_0>;
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};
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sd2 {
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regulator-name = "vdd-pre-reg";
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regulator-min-microvolt = <1350000>;
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regulator-max-microvolt = <1350000>;
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};
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sd3 {
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regulator-name = "vdd-1v8";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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regulator-always-on;
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regulator-boot-on;
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};
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ldo0 {
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regulator-name = "avdd-sys";
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regulator-min-microvolt = <1200000>;
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regulator-max-microvolt = <1200000>;
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regulator-always-on;
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regulator-boot-on;
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};
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ldo1 {
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regulator-name = "vdd-pex";
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regulator-min-microvolt = <1050000>;
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regulator-max-microvolt = <1050000>;
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};
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ldo2 {
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regulator-name = "vddio-sdmmc3";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <3300000>;
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};
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ldo3 {
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regulator-name = "vdd-cam-hv";
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regulator-min-microvolt = <2800000>;
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regulator-max-microvolt = <2800000>;
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};
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ldo4 {
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regulator-name = "vdd-rtc";
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regulator-min-microvolt = <1250000>;
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regulator-max-microvolt = <1250000>;
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regulator-always-on;
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regulator-boot-on;
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};
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ldo5 {
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regulator-name = "avdd-ts-hv";
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regulator-min-microvolt = <3000000>;
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regulator-max-microvolt = <3000000>;
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};
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ldo6 {
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regulator-name = "vdd-ts";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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regulator-always-on;
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regulator-boot-on;
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};
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ldo7 {
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regulator-name = "vdd-gen-pll-edp";
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regulator-min-microvolt = <1050000>;
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regulator-max-microvolt = <1050000>;
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regulator-always-on;
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regulator-boot-on;
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};
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ldo8 {
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regulator-name = "vdd-hdmi-dp";
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regulator-min-microvolt = <1050000>;
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regulator-max-microvolt = <1050000>;
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};
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};
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};
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