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power management and pseudo-devices

Currently, pseudo-devices are silently attached to the device tree without giving the driver any access to the associated device_t structure. As a result, the pseudo-device driver is unable to access much of the pmf framework. In particular, the pseudo-device cannot register a suspend/resume/shutdown handler, nor can it register to receive pmf event notifications.

It seems to me that it would be reasonably useful for pseudo-devices to be capabile of participating in pmf. One particular example I've run into recently is the swwdog pseudo-device. Other watchdog drivers can prevent a suspend if their timer is armed, but since swwdog is only a pseudo-device it cannot register a pmf handler.

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