New optional parameter supported by updated driver.

Signed-off-by: Patrick Havelange <patrick.havela...@essensium.com>
Reviewed-by: Esben Haabendal <es...@haabendal.dk>
---
 .../devicetree/bindings/iio/counter/ftm-quaddec.txt       | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iio/counter/ftm-quaddec.txt 
b/Documentation/devicetree/bindings/iio/counter/ftm-quaddec.txt
index 4d18cd722074..60554e6c4367 100644
--- a/Documentation/devicetree/bindings/iio/counter/ftm-quaddec.txt
+++ b/Documentation/devicetree/bindings/iio/counter/ftm-quaddec.txt
@@ -6,8 +6,14 @@ Required properties:
 - compatible:          Must be "fsl,ftm-quaddec".
 - reg:                 Must be set to the memory region of the flextimer.
 
-Optional property:
+Optional properties:
 - big-endian:          Access the device registers in big-endian mode.
+- poll-interval                Poll interval time in milliseconds for detecting
+                       the under/overflow of the counter. Default value
+                       is 100.
+                       A value of 0 disables polling. This value can also
+                       be set at runtime, but not to less than this initial
+                       value (except 0 for disabling).
 
 Example:
                counter0: counter@29d0000 {
-- 
2.17.1

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