The property "gpios" of GPIO hog node support the multiple GPIO entries.
Rephrase the details of this property for this new support.
Add details of new property "label" for GPIO label name.
diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
- line-name: The GPIO label name. If not present the node name is used.
+- label: The GPIO lable name. This can have multiple string for GPIO
+ label names to match with the GPIOs in "gpios" properties.
+ If line-name is prosent than name is taken from line-name. If
+ it is not then the name will be taken from label. If both are
+ not available then node name is used for GPIO label name.