iio: Add bindings for STM32 timer trigger driver

Define bindings for STM32 timer trigger

version 8:
- reword "reg" parameter description

version 4:
- remove triggers enumeration from DT
- add reg parameter

version 3:
- change file name
- add cross reference with mfd bindings

version 2:
- only keep one compatible
- add DT parameters to set lists of the triggers:
  one list describe the triggers created by the device
  another one give the triggers accepted by the device

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/iio/timer/stm32-timer-trigger.txt b/Documentation/devicetree/bindings/iio/timer/stm32-timer-trigger.txt
new file mode 100644 (file)
index 0000000..55a653d
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/timer/stm32-timer-trigger.txt
@@ -0,0 +1,23 @@
+STMicroelectronics STM32 Timers IIO timer bindings
+
+Must be a sub-node of an STM32 Timers device tree node.
+See ../mfd/stm32-timers.txt for details about the parent node.
+
+Required parameters:
+- compatible:  Must be "st,stm32-timer-trigger".
+- reg:         Identify trigger hardware block.
+
+Example:
+       timers@40010000 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "st,stm32-timers";
+               reg = <0x40010000 0x400>;
+               clocks = <&rcc 0 160>;
+               clock-names = "clk_int";
+
+               timer@0 {
+                       compatible = "st,stm32-timer-trigger";
+                       reg = <0>;
+               };
+       };