Done a litte Möre digging and got a working solution. I verified that the gpio was indeed working and toggled as expected. The DHT22 have very strict timing requirements when it comes to interpret the data sent from the sensor. It is best to do in kernel space. I saw that a driver is in progress for the next linux release so as a interim solution I tweaked the application reading the sensor and introduce some retries. Now it is possible to get a correct reading.
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