Add documentation for STMicroelectronics STM32 Low Power Timer
quadrature encoder and counter binding.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
---
.../bindings/iio/counter/stm32-lptimer-cnt.txt | 25 ++++++++++++++++++++++
1 file changed, 25 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt
diff --git a/Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt b/Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt
new file mode 100644
index 0000000..e31e54d
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt
@@ -0,0 +1,25 @@
+STMicroelectronics STM32 Low Power Timer quadrature encoder and counter
+
+STM32 LP Timer provides several counter modes. It can be used as:
+- quadrature encoder to detect angular position and direction of rotary
+ elements, from IN1 and IN2 input signals.
+- simple counter from IN1 input signal.
+
+Must be a sub-node of an STM32 LP Timer device tree node.
+See ../mfd/stm32-lptimer.txt for details about the parent node.
+
+Required properties:
+- compatible: Must be "st,stm32-lptimer-counter".
+- A pinctrl state named "default" can be defined to set IN1/IN2 pins in mode
+ of operation for LP Timer input signals on external pin.
+
+Example:
+ lptimer1: lptimer@0x40002400 {
+ compatible = "st,stm32-lptimer";
+ ...
+ counter {
+ compatible = "st,stm32-lptimer-counter";
+ pinctrl-names = "default";
+ pinctrl-0 = <&lptim1_in_pins>;
+ };
+ };
--
1.9.1
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