u-boot/doc/device-tree-bindings/regulator/fan53555.txt
Philipp Tomsich dfb0a70a1a power: add FAN53555 family support
This adds a driver for the FAN53555 family of regulators and wraps it
in a PMIC implementation.

While these devices support a 'normal' and 'suspend' mode (controlled
via an external pin) to switch between two programmable voltages, this
incarnation of the driver assumes that the device is always operating
in 'normal' mode.

Only setting/reading the programmed voltage is supported at this time
and the following device functionality remains unsupported:
  - switching the selected voltage (via a GPIO)
  - disabling the voltage output via software-control
This matches the functionality of the Linux driver.

Tested on a RK3399-Q7 (with 'option 5' devices): setting voltages from
the U-Boot shell and verifying output voltages on the board.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
2018-12-10 10:04:45 +01:00

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Binding for Fairchild FAN53555 regulators
Required properties:
- compatible: "fcs,fan53555"
- reg: I2C address
Optional properties:
- fcs,suspend-voltage-selector: declare which of the two available
voltage selector registers should be used for the suspend
voltage. The other one is used for the runtime voltage setting
Possible values are either <0> or <1>
- vin-supply: regulator supplying the vin pin
Example:
regulator@40 {
compatible = "fcs,fan53555";
regulator-name = "fan53555";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1800000>;
vin-supply = <&parent_reg>;
fcs,suspend-voltage-selector = <1>;
};