The following generic properties as defined in pinctrl-bindings.txt are valid
to specify in a pin configuration subnode:
- pins, function, bias-disable, bias-pull-down, bias-pull,up, drive-strength.
+ pins, function, bias-disable, bias-pull-down, bias-pull-up, drive-strength.
Non-empty subnodes must specify the 'pins' property.
Note that not all properties are valid for all pins.