1Bindings for Voltage controlled regulators 2========================================== 3 4Required properties: 5-------------------- 6- compatible : must be "vctrl-regulator". 7- regulator-min-microvolt : smallest voltage consumers may set 8- regulator-max-microvolt : largest voltage consumers may set 9- ctrl-supply : The regulator supplying the control voltage. 10- ctrl-voltage-range : an array of two integer values describing the range 11 (min/max) of the control voltage. The values specify 12 the control voltage needed to generate the corresponding 13 regulator-min/max-microvolt output voltage. 14 15Optional properties: 16-------------------- 17- ovp-threshold-percent : overvoltage protection (OVP) threshold of the 18 regulator in percent. Some regulators have an OVP 19 circuitry which shuts down the regulator when the 20 actual output voltage deviates beyond a certain 21 margin from the expected value for a given control 22 voltage. On larger voltage decreases this can occur 23 undesiredly since the output voltage does not adjust 24 immediately to changes in the control voltage. To 25 avoid this situation the vctrl driver breaks down 26 larger voltage decreases into multiple steps, where 27 each step is within the OVP threshold. 28- min-slew-down-rate : Describes how slowly the regulator voltage will decay 29 down in the worst case (lightest expected load). 30 Specified in uV / us (like main regulator ramp rate). 31 This value is required when ovp-threshold-percent is 32 specified. 33 34Example: 35 36 vctrl-reg { 37 compatible = "vctrl-regulator"; 38 regulator-name = "vctrl_reg"; 39 40 ctrl-supply = <&ctrl_reg>; 41 42 regulator-min-microvolt = <800000>; 43 regulator-max-microvolt = <1500000>; 44 45 ctrl-voltage-range = <200000 500000>; 46 47 min-slew-down-rate = <225>; 48 ovp-threshold-percent = <16>; 49 }; 50