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2016-02-09tools/gpio: create GPIO toolsLinus Walleij4-0/+176
This creates GPIO tools under tools/gpio/* and adds a single example program to list the GPIOs on a system. When proper devices are created it provides this minimal output: Cc: Johan Hovold <[email protected]> Cc: Michael Welling <[email protected]> Cc: Markus Pargmann <[email protected]> Signed-off-by: Linus Walleij <[email protected]>