pmbus_get_fan_rate_cached
rate = pmbus_get_fan_rate_cached(client, page, 0, percent);
rate = pmbus_get_fan_rate_cached(client, page, 0, rpm);
int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
EXPORT_SYMBOL_NS_GPL(pmbus_get_fan_rate_cached, "PMBUS");