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Add driver for STM32

This is a complete rewrite of the driver in linux-5.15. It reflects all the changes in the STM32 firmware made for REVB0 of MAURY. This includes:

  • IRQ-pins are no longer separated from GPIO-pins, instead the first 24 GPIO-pins can be used as IRQ-pins
  • for each IRQ the flow-type can be set
  • disabled (masked) IRQs are disabled in STM32 instead of simply been ignored
  • several registers in the STM32-firmware has changed because enable- and status-registers have been added for the additional IRQs
  • there is no default period for PWMs read from the device tree, this is up to the user of the PWM

Merge request reports

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