| Bindings for Voltage controlled regulators | |
| ========================================== | |
| Required properties: | |
| -------------------- | |
| - compatible : must be "vctrl-regulator". | |
| - regulator-min-microvolt : smallest voltage consumers may set | |
| - regulator-max-microvolt : largest voltage consumers may set | |
| - ctrl-supply : The regulator supplying the control voltage. | |
| - ctrl-voltage-range : an array of two integer values describing the range | |
| (min/max) of the control voltage. The values specify | |
| the control voltage needed to generate the corresponding | |
| regulator-min/max-microvolt output voltage. | |
| Optional properties: | |
| -------------------- | |
| - ovp-threshold-percent : overvoltage protection (OVP) threshold of the | |
| regulator in percent. Some regulators have an OVP | |
| circuitry which shuts down the regulator when the | |
| actual output voltage deviates beyond a certain | |
| margin from the expected value for a given control | |
| voltage. On larger voltage decreases this can occur | |
| undesiredly since the output voltage does not adjust | |
| inmediately to changes in the control voltage. To | |
| avoid this situation the vctrl driver breaks down | |
| larger voltage decreases into multiple steps, where | |
| each step is within the OVP threshold. | |
| - min-slew-down-rate : Describes how slowly the regulator voltage will decay | |
| down in the worst case (lightest expected load). | |
| Specified in uV / us (like main regulator ramp rate). | |
| This value is required when ovp-threshold-percent is | |
| specified. | |
| Example: | |
| vctrl-reg { | |
| compatible = "vctrl-regulator"; | |
| regulator-name = "vctrl_reg"; | |
| ctrl-supply = <&ctrl_reg>; | |
| regulator-min-microvolt = <800000>; | |
| regulator-max-microvolt = <1500000>; | |
| ctrl-voltage-range = <200000 500000>; | |
| min-slew-down-rate = <225>; | |
| ovp-threshold-percent = <16>; | |
| }; |