Sam Price commented on a discussion on cpukit/include/dev/gpio/gpio.h: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1499#note_159790

 > + *
 > + * The pin must already be configured with a trigger other than
 > + * #RTEMS_GPIO_TRIGGER_NONE.
 > + *
 > + * @param fd is the descriptor for the controller's device node.
 > + *
 > + * @param pin is the logical pin whose interrupt to deliver.
 > + *
 > + * @param handler is the handler to call.
 > + *
 > + * @param arg is the argument to pass to the handler.
 > + *
 > + * @retval 0 Successful operation.
 > + * @retval -1 An error occurred.  The errno is set to indicate the error.
 > + */
 > +int rtems_gpio_pin_irq_enable(int fd, uint32_t pin,

I think the interrupts were an oversight.  I drafted a possible version of this 
and need to look at it more tonight.  You probably don't want to call ioctrl 
calls from ISR routines.  So we would need the isr pin set/get calls also.


https://gitlab.rtems.org/TheSamPrice/rtems/-/merge_requests/12/diffs#7e0742779af6c8bf2bf16c86f8e5f41b092a249d_864_899


If it helps this is the esphome fully wired into this rtems api.
Which would keep it board generic.
https://github.com/thesamprice/esphome/blob/e6e0d939542f2d7b77f3c418ddff5686f8c7ddd4/esphome/components/rtems/gpio.cpp

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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1499#note_159790
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