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hw/mcu/dialog: Add callbacks on enter/exit sleep #2297

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hw/mcu/dialog: Add callbacks on enter/exit sleep #2297

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Commits on May 28, 2020

  1. hw/mcu/dialog: Add callbacks on enter/exit sleep 

    This patch adds callbacks to be called before and after deep sleep.
Those are intended to be registered by BSP which can then decide to
save/restore state of certain peripherals and release/acquire power
domains in order to save some power while M33 goes into deep sleep.

Note that similar power saving can usually be achieved if application
uses os_dev_open/close consistently, i.e. opens device only when
needed, which should properly acquire and release power domains
(although the actual behavior depends on a driver implementation).
However, there may still be some cases where quick save/restore is
possible and this can be handled in new callbacks.
    @andrzej-kaczmarek
    andrzej-kaczmarek committed May 28, 2020
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