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AM3352: RTC modes support

Part Number: AM3352
Other Parts Discussed in Thread: TPS65217, , TPS65910, TPS65218, TPS65218D0

Hi,

a customer needs the RTC modes with ALARM event wakeup for the AM3352 (e.g. Beaglebone with TPS65217).

I looked at the TI PSDK Linux documentation at

http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components_Kernel_Drivers.html#id42

RTC-Only and RTC+DDR Mode

The LCPD release also supports two RTC modes depending on what the specific hardware in use supports. RTC+DDR Mode is similar to the Suspend/Resume above but only supports wake by the Power Button present on the board or from an RTC ALARM2 Event. RTC-Only mode supports the same wake sources, however DDR context is not maintained so a wake event causes a cold boot.

RTC-Only mode is supported on:

  • AM437x GP EVM
  • AM437x SK EVM

RTC+DDR mode is supported on:

  • AM437x GP EVM

Whether or not your board enters RTC-Only mode or RTC+DDR mode depends on the regulator configuration and whether or not the regulator that supplies the DDR is configured to remain on during suspend. This is supported by the TPS65218 in use of the AM437x boards but not the TPS65217 or TPS65910 present on AM335x boards.

All of this is supported with the AM437x. Can we get this supported with the AM335x as well?

Apparently there have been some older kernels L3.x where RTC modes were supported.

Thanks!

--Gunter