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[u-boot] / doc / device-tree-bindings / regulator / fixed.txt
1 Fixed Voltage regulator
2
3 Binding:
4 The binding is done by the property "compatible" - this is different, than for
5 binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
6
7 Required properties:
8 - compatible: "regulator-fixed"
9 - regulator-name: this is required by the regulator uclass
10
11 Optional properties:
12 - gpio: GPIO to use for enable control
13 - startup-delay-us: startup time in microseconds
14 - regulator constraints (binding info: regulator.txt)
15 - enable-active-high: Polarity of GPIO is Active high. If this property
16   is missing, the default assumed is Active low.
17
18
19 Other kernel-style properties, are currently not used.
20
21 Note:
22 For the regulator constraints, driver expects that:
23 - regulator-min-microvolt is equal to regulator-max-microvolt
24 - regulator-min-microamp is equal to regulator-max-microamp
25
26 Example:
27 fixed_regulator@0 {
28         /* Mandatory */
29         compatible = "regulator-fixed";
30         regulator-name = "LED_3.3V";
31
32         /* Optional: */
33         gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
34
35         /* Optional for regulator uclass */
36         regulator-min-microvolt = <3300000>;
37         regulator-max-microvolt = <3300000>;
38         regulator-min-microamp = <15000>;
39         regulator-max-microamp = <15000>;
40         regulator-always-on;
41         regulator-boot-on;
42         enable-active-high;
43 };