Kernel-4.18.0-80.el8_samsung,s2mpa01

Binding for Samsung S2MPA01 regulator block

This is a part of device tree bindings for S2M family multi-function devices.
More information can be found in bindings/mfd/sec-core.txt file.

The S2MPA01 device provide buck and LDO regulators.

To register these with regulator framework instantiate under main device node
a sub-node named “regulators” with more sub-nodes for each regulator using the
common regulator binding documented in:

• Documentation/devicetree/bindings/regulator/regulator.txt

Names of regulators supported by S2MPA01 device:
- LDOn
- valid values for n are 1 to 26
- Example: LDO1, LD02, LDO26
- BUCKn
- valid values for n are 1 to 10.
- Example: BUCK1, BUCK2, BUCK9
Note: The ‘n’ in LDOn and BUCKn represents the LDO or BUCK number
as per the datasheet of device.

Optional properties of buck regulator nodes under “regulators” sub-node:

• regulator-ramp-delay: ramp delay in uV/us. May be 6250, 12500
  (default), 25000, or 50000. May be 0 for disabling the ramp delay on
  BUCK{1,2,3,4}.

  In the absence of the regulator-ramp-delay property, the default ramp
  delay will be used.

  Note: Some bucks share the ramp rate setting i.e. same ramp value
  will be set for a particular group of bucks so provide the same
  regulator-ramp-delay value for them.
  Groups sharing ramp rate:

  • buck{1,6},
  • buck{2,4},
  • buck{8,9,10}.

Example:

s2mpa01_pmic@66 {
    compatible = "samsung,s2mpa01-pmic";
    reg = <0x66>;

    regulators {
        ldo1_reg: LDO1 {
            regulator-name = "VDD_ALIVE";
            regulator-min-microvolt = <1000000>;
            regulator-max-microvolt = <1000000>;
        };

        ldo2_reg: LDO2 {
            regulator-name = "VDDQ_MMC2";
            regulator-min-microvolt = <2800000>;
            regulator-max-microvolt = <2800000>;
            regulator-always-on;
        };

        buck1_reg: BUCK1 {
            regulator-name = "vdd_mif";
            regulator-min-microvolt = <950000>;
            regulator-max-microvolt = <1350000>;
            regulator-always-on;
            regulator-boot-on;
        };

        buck2_reg: BUCK2 {
            regulator-name = "vdd_arm";
            regulator-min-microvolt = <950000>;
            regulator-max-microvolt = <1350000>;
            regulator-always-on;
            regulator-boot-on;
            regulator-ramp-delay = <50000>;
        };
    };
};