Add documentation for STMicroelectronics STM32 Low-Power Timer Trigger
binding.

Signed-off-by: Fabrice Gasnier <[email protected]>
---
Changes in v2:
- s/Low Power/Low-Power
- remove leading 0x in example (parent node)
- improve reg property description
---
 .../bindings/iio/timer/stm32-lptimer-trigger.txt   | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt

diff --git 
a/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt 
b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
new file mode 100644
index 0000000..466d99f
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
@@ -0,0 +1,23 @@
+STMicroelectronics STM32 Low-Power Timer Trigger
+
+STM32 Low-Power Timer provides trigger source (LPTIM output) that can be used
+by STM32 internal ADC and/or DAC.
+
+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-trigger".
+- reg:                 Selects trigger hardware block. Must be 0, 1 or 2
+                       respectively for lptimer1, lptimer2 or lptimer3
+                       trigger output.
+
+Example:
+       lptimer1: lptimer@40002400 {
+               compatible = "st,stm32-lptimer";
+               ...
+               trigger@0 {
+                       compatible = "st,stm32-lptimer-trigger";
+                       reg = <0>;
+               };
+       };
-- 
1.9.1

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