regulator: gpio-regulator: Allow use of GPIO controlled regulators though DT

Here we provide the GPIO Regulator driver with Device Tree capability, so
that when a platform is booting with DT instead of platform data we can
still make full use of it.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/regulator/gpio-regulator.txt b/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
new file mode 100644
index 000000000000..3703be2ab821
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/gpio-regulator.txt
@@ -0,0 +1,36 @@
+GPIO controlled regulators
+
+Required properties:
+- compatible            : Must be "regulator-gpio".
+
+Optional properties:
+- gpio-enable           : GPIO to use to enable/disable the regulator.
+- gpios                 : GPIO group used to control voltage.
+- states                : Selection of available voltages and GPIO configs.
+- startup-delay-us      : Startup time in microseconds.
+- enable-active-high    : Polarity of GPIO is active high (default is low).
+
+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;
+
+                gpio-enable = <&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;
+        };