The bgpio_get_set() call should return a value clamped to [0,1],
the current code will return a negative value if reading
bit 31, which turns the value negative as this is a signed value
and thus gets interpreted as an error by the gpiolib core.
Found on the gpio-mxc but applies to any MMIO driver.
Cc: stable@vger.kernel.org # 4.3+ Cc: kernel@pengutronix.de Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Fixes: e20538b82f1f ("gpio: Propagate errors from chip->get()") Reported-by: Clemens Gruber <clemens.gruber@pqgruber.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>