Add documentation for the "status-gpios" property.

Signed-off-by: Artur Rojek <[email protected]>
---
 .../devicetree/bindings/power/supply/gpio-charger.txt         | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.txt 
b/Documentation/devicetree/bindings/power/supply/gpio-charger.txt
index adbb5dc5b6e9..b98a05a4973c 100644
--- a/Documentation/devicetree/bindings/power/supply/gpio-charger.txt
+++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.txt
@@ -14,12 +14,16 @@ Required properties :
      usb-cdp (USB charging downstream port)
      usb-aca (USB accessory charger adapter)
 
+Optional properties:
+ - status-gpios: GPIO indicating the charger status
+
 Example:
 
        usb_charger: charger {
                compatible = "gpio-charger";
                charger-type = "usb-sdp";
                gpios = <&gpf0 2 0 0 0>;
+               status-gpios = <&gpf0 3 0 0 0>;
        }
 
        battery {
-- 
2.20.1

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