summaryrefslogtreecommitdiff
path: root/doc/device-tree-bindings
diff options
context:
space:
mode:
authorPrzemyslaw Marczak <p.marczak@samsung.com>2015-04-20 20:07:48 +0200
committerSimon Glass <sjg@chromium.org>2015-05-14 18:49:38 -0600
commit9923a8b45098fa4160cca113c10240973ecacf7e (patch)
tree816720a490d9b6a07af4f277c33b1a1d5889e168 /doc/device-tree-bindings
parent1757df4693fcde9fb4d4de02a22cc74d6f5caec1 (diff)
downloadu-boot-imx-9923a8b45098fa4160cca113c10240973ecacf7e.zip
u-boot-imx-9923a8b45098fa4160cca113c10240973ecacf7e.tar.gz
u-boot-imx-9923a8b45098fa4160cca113c10240973ecacf7e.tar.bz2
dm: regulator: add fixed voltage regulator driver
This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc/device-tree-bindings')
-rw-r--r--doc/device-tree-bindings/regulator/fixed.txt38
1 files changed, 38 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/regulator/fixed.txt b/doc/device-tree-bindings/regulator/fixed.txt
new file mode 100644
index 0000000..4ff39b8
--- /dev/null
+++ b/doc/device-tree-bindings/regulator/fixed.txt
@@ -0,0 +1,38 @@
+Fixed Voltage regulator
+
+Binding:
+The binding is done by the property "compatible" - this is different, than for
+binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
+
+Required properties:
+- compatible: "regulator-fixed"
+- regulator-name: this is required by the regulator uclass
+
+Optional properties:
+- gpio: GPIO to use for enable control
+- regulator constraints (binding info: regulator.txt)
+
+Other kernel-style properties, are currently not used.
+
+Note:
+For the regulator constraints, driver expects that:
+- regulator-min-microvolt is equal to regulator-max-microvolt
+- regulator-min-microamp is equal to regulator-max-microamp
+
+Example:
+fixed_regulator@0 {
+ /* Mandatory */
+ compatible = "regulator-fixed";
+ regulator-name = "LED_3.3V";
+
+ /* Optional: */
+ gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
+
+ /* Optional for regulator uclass */
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-min-microamp = <15000>;
+ regulator-max-microamp = <15000>;
+ regulator-always-on;
+ regulator-boot-on;
+};