u-boot/doc/device-tree-bindings/regulator/fixed.txt
Przemyslaw Marczak 9923a8b450 dm: regulator: add fixed voltage regulator driver
This driver implements regulator operations for fixed Voltage/Current
value regulators. beside the standard regulator constraints, which are
put into the uclass platform data, a typical fixed regulator node provides
few additional properties like:
- gpio
- gpio-open-drain
- enable-active-high
- startup-delay-us
The only 'gpio' is used by this driver and is kept in structure of type
'fixed_regulator_platdata', as a device platform data (dev->platdata).

The driver implements:
- get_value
- get_current
- get_enable
- set_enable

The regulator calls and commands can be used for fixed-regulator devices,
and the proper error will be returned for prohibited.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-05-14 18:49:38 -06:00

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Fixed Voltage regulator
Binding:
The binding is done by the property "compatible" - this is different, than for
binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
Required properties:
- compatible: "regulator-fixed"
- regulator-name: this is required by the regulator uclass
Optional properties:
- gpio: GPIO to use for enable control
- regulator constraints (binding info: regulator.txt)
Other kernel-style properties, are currently not used.
Note:
For the regulator constraints, driver expects that:
- regulator-min-microvolt is equal to regulator-max-microvolt
- regulator-min-microamp is equal to regulator-max-microamp
Example:
fixed_regulator@0 {
/* Mandatory */
compatible = "regulator-fixed";
regulator-name = "LED_3.3V";
/* Optional: */
gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
/* Optional for regulator uclass */
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-min-microamp = <15000>;
regulator-max-microamp = <15000>;
regulator-always-on;
regulator-boot-on;
};