On Wed, May 13, 2015 at 04:16:58PM +0200, Johan Hovold wrote: > On Wed, May 13, 2015 at 08:50:01AM -0500, Robert Nelson wrote: > > Fixes: http://bugs.elinux.org/issues/143 > > > > Commit 672e2b147 which introduced proper shutdown chose to let the PMIC go into sleep-state (aka "RTC-only mode") rather than off-state. This was fine for rev A5 on which that patch was tested, but since then two changes have been made to the power supply scheme: > > > > (rev A6) enable of the 3v3b regulator moved from LDO2 to LDO4 (3v3a) > > side-effect: 3v3b rail remains on in sleep-mode (also in off-mode when battery-powered) > > > > (rev A6A) am335x vdds supply moved from LDO3 to LDO1 > > side-effect: vdds remains supplied in sleep-mode > > > > As a result heavy leakage occurs from vdds (directly) and 3v3b (via i/o pins) to the 3v3a. The amount of current depends on external connections, but for example leaving a serial console cable connected in this state resulted in serious violation of am335x absolute maximum ratings, with potential for hardware damage. > > > > Reported-by: Matthijs van Duin <matthijsvanduin@xxxxxxxxx> > > Tested-by: Matthijs van Duin <matthijsvanduin@xxxxxxxxx> > > Signed-off-by: Robert Nelson <robertcnelson@xxxxxxxxx> > > Cc: Tony Lindgren <tony@xxxxxxxxxxx> > > Cc: Felipe Balbi <balbi@xxxxxx> > > Cc: Johan Hovold <johan@xxxxxxxxxx> > > This should go into stable as well: > > Fixes: 672e2b147413 ("ARM: dts: am335x-boneblack: enable power off and > rtc wake up") > Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.19 > Acked-by: Johan Hovold <johan@xxxxxxxxxx> By the way, perhaps you should add a comment in the tps node explaining why ti,pmic-shutdown-controller must not be disabled (on what revisions of hardware) as well? Johan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
