a functional name for the consumer of this GPIO line as set by whatever is using it, will be null if there is no current user but may also be null if the consumer doesn't set this up
the name of this GPIO line, such as the output pin of the line on the chip, a rail or a pin header name on a board, as specified by the gpio chip, may be null
various flags for this line
the local offset on this GPIO device, fill this in when requesting the line information from the kernel
Information about a certain GPIO line