Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
 Documentation/devicetree/bindings/gpio/gpio-sx150x.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt 
b/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
index c809acb..02b92ae 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
@@ -26,6 +26,15 @@ The GPIO expander can optionally be used as an interrupt 
controller, in
 which case it uses the default two cell specifier as described in
 Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
 
+Optional properties:
+
+- semtech,io-polarity: A bit-mask which enables polarity inversion for
+                      each IO line in the expander. Setting the bit
+                      at position n inverts the polarity of that IO
+                      line, while clearing it results in normal
+                      polarity. For chips with fewer than 16 IO pins,
+                      high-end bits are ignored.
+
 Example:
 
        i2c_gpio_expander@20{
-- 
2.5.5

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