Power management (HMX)

Overview⚓︎

This platform supports suspend and a long range of wake-up signals. See the individual wake up links below.

Suspend⚓︎

Click on the target interface to read more about how to set up sleep and wake up.

Wake up⚓︎

Enter suspend⚓︎

systemctl suspend

Shutdown⚓︎

Shutdown/cut-off state turns the system off with close to zero power consumption. It will only work if both internal and external Start signals are LOW/off.

shutdown -h now
#or
poweroff

Check wakeup source⚓︎

Most of the signals would be registerd in /sys/class/wakeup and the folowing example gives the temporary name: name: and event_count. Check the counter before enter suspend. For gpio-keys there is just one counter so START signals and Digital input should be checked in '/dev/input/event'.

for d in /sys/class/wakeup/wakeup*; do 
    echo -n "$(basename $d): $(cat $d/name) -> " && cat $d/event_count; 
done

Example output from a scarthgap system

wakeup0: 30370000.snvs:snvs-powerkey -> 0
wakeup1: 30370000.snvs:snvs-rtc-lp -> 0
wakeup10: 3-001e -> 0 (Accelerometer)
wakeup11: spi1.2 -> 0 (CAN)
wakeup12: spi1.3 -> 0 (CAN)
wakeup13: spi3.0 -> 0 (CAN)
wakeup14: spi3.1 -> 0 (CAN)
wakeup2: alarmtimer.0.auto -> 0
wakeup3: mmc2 -> 0
wakeup4: mmc0 -> 0
wakeup5: mmc1 -> 0
wakeup6: gpio-keys -> 242
wakeup7: 308c0000.can -> 0
wakeup8: 308d0000.can -> 0
wakeup9: 1-0051 -> 946 (RTC)

Configure wakeup source in userspace⚓︎

The following list is generated using a script. Note that paths and wakeup IDs may change depending on your software and hardware version. If unsure, you can find the script here and run it on your device to get a similar output.

Hardware Mapping (Helper)⚓︎

Use this list to identify which physical interface corresponds to which CAN interface or component:

3-001e -> Accelerometer
1-0051 -> RTC (Main board w/ battery backup)
30370000.snvs:snvs-rtc-lp -> Module RTC
spi1.2 -> CAN4
spi1.3 -> CAN5
spi3.0 -> CAN0
spi3.1 -> CAN3
308c0000.can -> CAN2
308d0000.can -> CAN1

Wakeup Sources Table⚓︎

WAKEUP ID	IFACE	SET WAKEUP PATH	STATUS	EVENTS	EVENTS PATH
wakeup0	platform	/sys/devices/platform/soc@0/30000000.bus/30370000.snvs/30370000.snvs:snvs-powerkey/power/wakeup	enabled	0	/sys/class/wakeup/wakeup0/event_count
wakeup1	platform	/sys/devices/platform/soc@0/30000000.bus/30370000.snvs/30370000.snvs:snvs-rtc-lp/power/wakeup	enabled	0	/sys/class/wakeup/wakeup1/event_count
wakeup10	i2c	/sys/bus/i2c/devices/3-001e/power/wakeup	enabled	0	/sys/class/wakeup/wakeup10/event_count
wakeup11	spi	/sys/bus/spi/devices/spi1.2/power/wakeup	enabled	0	/sys/class/wakeup/wakeup11/event_count
wakeup12	spi	/sys/bus/spi/devices/spi1.3/power/wakeup	enabled	0	/sys/class/wakeup/wakeup12/event_count
wakeup13	spi	/sys/bus/spi/devices/spi3.0/power/wakeup	enabled	0	/sys/class/wakeup/wakeup13/event_count
wakeup14	spi	/sys/bus/spi/devices/spi3.1/power/wakeup	enabled	0	/sys/class/wakeup/wakeup14/event_count
wakeup2	rtc	/sys/devices/platform/soc@0/30000000.bus/30370000.snvs/30370000.snvs:snvs-rtc-lp/rtc/rtc1/alarmtimer.0.auto/power/wakeup	enabled	0	/sys/class/wakeup/wakeup2/event_count
wakeup3	unknown	n/a	n/a	0	/sys/class/wakeup/wakeup3/event_count
wakeup4	unknown	n/a	n/a	0	/sys/class/wakeup/wakeup4/event_count
wakeup5	unknown	n/a	n/a	0	/sys/class/wakeup/wakeup5/event_count
wakeup6	gpio	/sys/devices/platform/gpio-keys/power/wakeup	enabled	242	/sys/class/wakeup/wakeup6/event_count
wakeup7	platform	/sys/devices/platform/soc@0/30800000.bus/30800000.spba-bus/308c0000.can/power/wakeup	enabled	0	/sys/class/wakeup/wakeup7/event_count
wakeup8	platform	/sys/devices/platform/soc@0/30800000.bus/30800000.spba-bus/308d0000.can/power/wakeup	enabled	0	/sys/class/wakeup/wakeup8/event_count
wakeup9	i2c	/sys/bus/i2c/devices/1-0051/power/wakeup	enabled	1060	/sys/class/wakeup/wakeup9/event_count

Examples⚓︎

Disable wakeup source (e.g., RTC):

echo disabled > /sys/bus/i2c/devices/1-0051/power/wakeup

Enable wakeup source (e.g., RTC):

echo enabled > /sys/bus/i2c/devices/1-0051/power/wakeup