3.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Matthijs van Duin <matthijsvand...@gmail.com> commit 7a6cb0abe1aa63334f3ded6d2b6c8eca80e72302 upstream. Avoid entering "RTC-only mode" at poweroff. It is unsupported by most versions of BeagleBone, and risks hardware damage. The damaging configuration is having system-power-controller without ti,pmic-shutdown-controller. Reported-by: Matthijs van Duin <matthijsvand...@gmail.com> Tested-by: Matthijs van Duin <matthijsvand...@gmail.com> Signed-off-by: Robert Nelson <robertcnel...@gmail.com> Cc: Tony Lindgren <t...@atomide.com> Cc: Felipe Balbi <ba...@ti.com> Cc: Johan Hovold <jo...@kernel.org> [Matthijs van Duin: added explanatory comments] Signed-off-by: Matthijs van Duin <matthijsvand...@gmail.com> Fixes: http://bugs.elinux.org/issues/143 [t...@atomide.com: updated comments with the hardware breaking info] Signed-off-by: Tony Lindgren <t...@atomide.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/arm/boot/dts/am335x-bone-common.dtsi | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) --- a/arch/arm/boot/dts/am335x-bone-common.dtsi +++ b/arch/arm/boot/dts/am335x-bone-common.dtsi @@ -226,6 +226,25 @@ /include/ "tps65217.dtsi" &tps { + /* + * Configure pmic to enter OFF-state instead of SLEEP-state ("RTC-only + * mode") at poweroff. Most BeagleBone versions do not support RTC-only + * mode and risk hardware damage if this mode is entered. + * + * For details, see linux-omap mailing list May 2015 thread + * [PATCH] ARM: dts: am335x-bone* enable pmic-shutdown-controller + * In particular, messages: + * http://www.spinics.net/lists/linux-omap/msg118585.html + * http://www.spinics.net/lists/linux-omap/msg118615.html + * + * You can override this later with + * &tps { /delete-property/ ti,pmic-shutdown-controller; } + * if you want to use RTC-only mode and made sure you are not affected + * by the hardware problems. (Tip: double-check by performing a current + * measurement after shutdown: it should be less than 1 mA.) + */ + ti,pmic-shutdown-controller; + regulators { dcdc1_reg: regulator@0 { regulator-always-on; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
