GL518_REG_VIN2_LIMIT
val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);