Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / regulator / gpio-regulator.txt

diff --git a/kernel/Documentation/devicetree/bindings/regulator/gpio-regulator.txt b/kernel/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
new file mode 100644 (file)
index 0000000..e5cac1e
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
@@ -0,0 +1,41 @@
+GPIO controlled regulators
+
+Required properties:
+- compatible           : Must be "regulator-gpio".
+- states               : Selection of available voltages and GPIO configs.
+                          if there are no states, then use a fixed regulator
+
+Optional properties:
+- enable-gpio          : GPIO to use to enable/disable the regulator.
+- gpios                        : GPIO group used to control voltage.
+- gpios-states         : gpios pin's initial states array. 0: LOW, 1: HIGH.
+                         defualt is LOW if nothing is specified.
+- startup-delay-us     : Startup time in microseconds.
+- enable-active-high   : Polarity of GPIO is active high (default is low).
+- regulator-type       : Specifies what is being regulated, must be either
+                         "voltage" or "current", defaults to current.
+
+Any property defined as part of the core regulator binding defined in
+regulator.txt can also be used.
+
+Example:
+
+       mmciv: gpio-regulator {
+               compatible = "regulator-gpio";
+
+               regulator-name = "mmci-gpio-supply";
+               regulator-min-microvolt = <1800000>;
+               regulator-max-microvolt = <2600000>;
+               regulator-boot-on;
+
+               enable-gpio = <&gpio0 23 0x4>;
+               gpios = <&gpio0 24 0x4
+                        &gpio0 25 0x4>;
+               states = <1800000 0x3
+                         2200000 0x2
+                         2600000 0x1
+                         2900000 0x0>;
+
+               startup-delay-us = <100000>;
+               enable-active-high;
+       };