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Voltage/Current regulator
Binding:
The regulator devices don't use the "compatible" property. The binding is done
by the prefix of regulator node's name. Usually the pmic I/O driver will provide
the array of 'struct pmic_child_info' with the prefixes and compatible drivers.
The bind is done by calling function: pmic_bind_childs().
Example drivers:
pmic: drivers/power/pmic/max77686.c
regulator: drivers/power/regulator/max77686.c
For the node name e.g.: "prefix[:alpha:]num { ... }":
- the driver prefix should be: "prefix" or "PREFIX" - case insensitive
- the node name's "num" is set as "dev->driver_data" on bind
Example the prefix "ldo" will pass for: "ldo1", "ldo@1", "LDO1", "LDOREG@1"...
Required properties:
- regulator-name: a string, required by the regulator uclass
Note
The "regulator-name" constraint is used for setting the device's uclass
platform data '.name' field. And the regulator device name is set from
it's node name.
Optional properties:
- regulator-min-microvolt: a minimum allowed Voltage value
- regulator-max-microvolt: a maximum allowed Voltage value
- regulator-min-microamp: a minimum allowed Current value
- regulator-max-microamp: a maximum allowed Current value
- regulator-always-on: regulator should never be disabled
- regulator-boot-on: enabled by bootloader/firmware
Other kernel-style properties, are currently not used.
Note:
For the regulator autoset from constraints, the framework expects that:
- regulator-min-microvolt is equal to regulator-max-microvolt
- regulator-min-microamp is equal to regulator-max-microamp
- regulator-always-on or regulator-boot-on is set
Example:
ldo0 {
/* Mandatory */
regulator-name = "VDDQ_EMMC_1.8V";
/* Optional */
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-min-microamp = <100000>;
regulator-max-microamp = <100000>;
regulator-always-on;
regulator-boot-on;
};
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