On Wed, Oct 18, 2017 at 01:28:30PM +0200, Geert Uytterhoeven wrote: > On Wed, Oct 18, 2017 at 1:24 PM, Mark Brown <broonie@xxxxxxxxxx> wrote: > >> Hence you cannot enable wakeup mode while suspending, as the proper > >> system suspend/resume procedure is: > >> 1. Enable backup mode in the PMIC, > >> 2. Switch ACC off (no-op as backup mode has been enabled), > >> 3. Suspend to RAM (PSCI suspend) => system suspends, > >> 4. Switch ACC on => system wakes up. > >> If you would combine steps 1 and 3, you can no longer do step 2 in between. > >> Yes, it's complicated :-( > > I'm confused, I thought this was a physical switch but that's talking > > about this as something software controlled (at least in step 2)? > The ACC switch is a physical switch. > Steps 1 and 3 are performed by software running on the board's SoC. > Steps 2 and 4 are performed by the external user (human or remote board > farm control hookup). That's horrible. There's still the question about potentially using the existing wakeup file to manage if the device is a wakeup source but otherwise I guess the only other thing that'd make sense would be just having a property in the DT.
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