• Russ Dill's avatar
    regulator: tps65217: Enable suspend configuration · 3de56099
    Russ Dill authored
    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: default avatarRuss Dill <Russ.Dill@ti.com>
    [Enhanced commit log and added dynamic allocation for strobes]
    Signed-off-by: default avatarKeerthy <j-keerthy@ti.com>
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    3de56099
tps65217-regulator.c 9.16 KB