The datasheet for the DS18B20 says:
To assure that the DS18B20 has sufficient supply current, it is necessary to provide a strong pullup on the 1-Wire bus whenever temperature conversions are taking place or data is being
copied from the scratchpad to EEPROM.
I use w1-gpio and w1-therm, how can I configure them in a way that I have an active pullup? Is it enough the output "high" on the GPIO pin or do I need to put a transistor onto my brealout board?