--- zzzz-none-000/linux-3.10.107/Documentation/devicetree/bindings/mfd/stmpe.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/devicetree/bindings/mfd/stmpe.txt	2021-02-04 17:41:59.000000000 +0000
@@ -13,6 +13,7 @@
  - interrupt-parent             : Specifies which IRQ controller we're connected to
  - wakeup-source                : Marks the input device as wakable
  - st,autosleep-timeout         : Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
+ - irq-gpio                     : If present, which GPIO to use for event IRQ
 
 Example: