xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/regulator/samsung,s2mps11.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981)

Binding for Samsung S2M family 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 S2MPS11/13/14/15 and S2MPU02 devices 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 different devices:
	- LDOn
		  - valid values for n are:
			- S2MPS11: 1 to 38
			- S2MPS13: 1 to 40
			- S2MPS14: 1 to 25
			- S2MPS15: 1 to 27
			- S2MPU02: 1 to 28
		  - Example: LDO1, LDO2, LDO28
	- BUCKn
		  - valid values for n are:
			- S2MPS11: 1 to 10
			- S2MPS13: 1 to 10
			- S2MPS14: 1 to 5
			- S2MPS15: 1 to 10
			- S2MPU02: 1 to 7
		  - 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 the nodes under "regulators" sub-node:
 - regulator-ramp-delay: ramp delay in uV/us. May be 6250, 12500,
   25000 (default) or 50000.

   Additionally S2MPS11 supports disabling ramp delay for BUCK{2,3,4,6}
   by setting it to <0>.

   Note: On S2MPS11 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{3,4},
    - buck{7,8,10}.

 - samsung,ext-control-gpios: On S2MPS14 the LDO10, LDO11 and LDO12 can be
   configured to external control over GPIO. To turn this feature on this
   property must be added to the regulator sub-node:
    - samsung,ext-control-gpios: GPIO specifier for one GPIO
                                 controlling this regulator (enable/disable)
  Example:
	LDO12 {
		regulator-name = "V_EMMC_2.8V";
		regulator-min-microvolt = <2800000>;
		regulator-max-microvolt = <2800000>;
		samsung,ext-control-gpios = <&gpk0 2 0>;
	};


Example:

	s2mps11_pmic@66 {
		compatible = "samsung,s2mps11-pmic";
		reg = <0x66>;

		regulators {
			ldo1_reg: LDO1 {
				regulator-name = "VDD_ABB_3.3V";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
			};

			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_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>;
			};
		};
	};