GPIOD_FLAG_EDGE_FALLING
assign_bit(GPIOD_FLAG_EDGE_FALLING, &flags,
if (test_bit(GPIOD_FLAG_EDGE_FALLING, &dflags))
set_bit(GPIOD_FLAG_EDGE_FALLING, &desc->flags);
clear_bit(GPIOD_FLAG_EDGE_FALLING, &desc->flags);
clear_bit(GPIOD_FLAG_EDGE_FALLING, &desc->flags);
clear_bit(GPIOD_FLAG_EDGE_FALLING, &flags);