[PATCH v4 2/3] dt-bindings: pinctrl: mcp23s08: add documentation for drive-open-drain

[Phil Reid <preid@xxxxxxxxxxxxxxxxx>]

This flag set the mcp23s08 device irq type to open drain active low.

Acked-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
index 7d262e9..72bac30 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
@@ -45,6 +45,8 @@ Optional properties:
   - first cell is the pin number
   - second cell is used to specify flags.
 - interrupt-controller: Marks the device node as a interrupt controller.
+- drive-open-drain: Sets the ODR flag in the IOCON register. This configures
+        the IRQ output as open drain active low.
 
 Optional device specific properties:
 - microchip,irq-mirror: Sets the mirror flag in the IOCON register. Devices
-- 
1.8.3.1

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