SLEWRATE_SHIFT
*config |= (info->ops->get_slewrate(pio, pin) << SLEWRATE_SHIFT);
(config & SLEWRATE) >> SLEWRATE_SHIFT);
#define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_SHIFT)
#define SLEWRATE (SLEWRATE_MASK << SLEWRATE_SHIFT)