tree 40cf8dec1a8084cc745d3ed5245c7f7753a99f1d
parent 1a695a905c18548062509178b98bc91e67510864
author Russ Dill <Russ.Dill@ti.com> 1466756887 +0530
committer Mark Brown <broonie@kernel.org> 1467046603 +0100

regulator: tps65217: Enable suspend configuration

The TPS65217 has a pre-defined power-up / power-down sequence which in
a typical application does not need to be changed. However, it is possible
to define custom sequences under I2C control. The power-up sequence is
defined by strobes and delay times. Each output rail is assigned to a
strobe to determine the order in which the rails are enabled.

Every regulator of tps65217 PMIC has sequence registers and every
regulator has a default strobe value and gets disabled when a particular
power down sequence occurs.

To keep a regulator on during suspend we write value 0 to strobe so
that the regulator is out of all sequencers and is not impacted by any
power down sequence. Hence saving the default strobe value during probe
so that when we want to regulator to be enabled during suspend we write 0
to strobe and when we want it to get disabled during suspend we write
the default saved strobe value.

This allows platform data to specify which power rails should be on or off
during RTC only suspend. This is necessary to keep DDR state while in RTC
only suspend.

Signed-off-by: Russ Dill <Russ.Dill@ti.com>
[Enhanced commit log and added dynamic allocation for strobes]
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>