MIPS: txx9: gpio: use new line value setter callbacks
struct gpio_chip now has callbacks for setting line values that return an integer, allowing to indicate failures. Convert the drivers to using them. Signed-off-by:Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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