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This patch adds driver for temperature/humidity sensor connected via GPIO. To compile it into kernel add "device gpioths". To activate driver, use hints (.at and .pins) for gpiobus. As result it will provide temperature & humidity values via sysctl. DHT11 is cheap & popular temperature/humidity sensor used via GPIO on ARM or MIPS devices like Raspberry Pi or Onion Omega. Reviewed by: adrian Approved by: adrian (mentor) Differential Revision: https://reviews.freebsd.org/D9185