[PATCHv3 0/9] ARM: OMAP2+: AM33XX: Add suspend-resume support

[Russ Dill]

On Wed, Sep 4, 2013 at 8:01 AM, Kevin Hilman <khilman at linaro.org> wrote:
> Hi Dave,
>
>> Thanks for taking the time to try this out, it does seem there are a few
>> kinks with BeagleBone Black but we'll get those worked out.
>
> I also just noticed that wake from RTC isn't working, but wake from
> serial console does.  Does RTC wake work for you?  (I use rtcwake -m
> mem -s4)
>
> Kevin

On Beaglebone white or black? For PG 1.0 (Beaglebone white) there is
the following errata:

"RTC: 32.768-kHZ Clock is Gating Off"

Details The RTC has a clock gating issue that stops the internal
32.768-kHz clock when the VDD_CORE voltage domain drops below the
recommended operating range or the PWRONRSTn input terminal is held
low. This issue has the following side effects:

- The RTC counters stop incrementing when the 32.768-kHz clock is
gated. This causes the RTC to lose time while the clock is gated.

- A wakeup event applied to the EXT_WAKEUP input terminal is masked if
the EXT_WAKEUP_DB_EN bit in the RTC PMIC register (0x98) is set to 1
which enables the de-bounce function for the EXT_WAKEUP input. This
occurs because the 32.768-kHz clock is being used to clock the
de-bounce circuit.

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