create_constraint_attribute
ret = create_constraint_attribute(i, "power_limit_uw",
ret = create_constraint_attribute(i, "time_window_us",
ret = create_constraint_attribute(i, "name", S_IRUGO,
ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO,
ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO,
ret = create_constraint_attribute(i, "max_time_window_us",
ret = create_constraint_attribute(i, "min_time_window_us",