Merge branches 'for-4.13/multitouch', 'for-4.13/retrode', 'for-4.13/transport-open...
[sfrench/cifs-2.6.git] / Documentation / devicetree / bindings / regulator / vctrl.txt
1 Bindings for Voltage controlled regulators
2 ==========================================
3
4 Required 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
15 Optional 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                           inmediately 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
34 Example:
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         };