[PATCH v3 7/9] dt-bindings: iio: Add STM32 LPTimer quadrature encoder and counter

[Fabrice Gasnier]

Add documentation for STMicroelectronics STM32 Low-Power Timer
quadrature encoder and counter binding.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier at st.com>
Acked-by: Jonathan Cameron <jic23 at kernel.org>
Acked-by: Rob Herring <robh at kernel.org>
---
Changes in v3:
- Rob's comment on node name: timer at ...

Changes in v2:
- s/Low Power/Low-Power
- remove leading 0x in example (parent node)
- improve properties descriptions
---
 .../bindings/iio/counter/stm32-lptimer-cnt.txt     | 27 ++++++++++++++++++++++
 1 file changed, 27 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..a04aa5c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt
@@ -0,0 +1,27 @@
+STMicroelectronics STM32 Low-Power Timer quadrature encoder and counter
+
+STM32 Low-Power 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 Low-Power Timer device tree node.
+See ../mfd/stm32-lptimer.txt for details about the parent node.
+
+Required properties:
+- compatible:		Must be "st,stm32-lptimer-counter".
+- pinctrl-names: 	Set to "default".
+- pinctrl-0: 		List of phandles pointing to pin configuration nodes,
+			to set IN1/IN2 pins in mode of operation for Low-Power
+			Timer input on external pin.
+
+Example:
+	timer at 40002400 {
+		compatible = "st,stm32-lptimer";
+		...
+		counter {
+			compatible = "st,stm32-lptimer-counter";
+			pinctrl-names = "default";
+			pinctrl-0 = <&lptim1_in_pins>;
+		};
+	};
-- 
1.9.1