IMX suspend: Difference between revisions
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$ echo mem > /sys/power/state | $ echo mem > /sys/power/state | ||
</pre> | </pre> | ||
= Wake up = | |||
There are | There are many possible ways to wake up from suspend.<br> | ||
A few examples:<br> | |||
- Pushing the ON/OFF button (when present on the board)<br> | |||
- Pushing a button on the board which has the boolean property "gpio-key,wakeup" set in its device tree node (under gpio_keys), e.g.: | |||
gpio-keys { | |||
compatible = "gpio-keys"; | |||
pinctrl-names = "default"; | |||
pinctrl-0 = <&pinctrl_gpio_keys>; | |||
back { | |||
label = "Back"; | |||
gpios = <&gpio5 20 GPIO_ACTIVE_LOW>; | |||
linux,code = <KEY_BACK>; | |||
'''gpio-key,wakeup'''; | |||
}; | |||
}; | |||
- Using the RTC you can wake at a specific time (see the [[IMX_RTC|RTC section]])<br> | |||
= Current consumption when suspended = | = Current consumption when suspended = | ||
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== VAR-SOM-MX7 == | == VAR-SOM-MX7 == | ||
TBD |
Revision as of 15:57, 13 December 2016
Suspend to RAM
This state offers significant power savings as everything in the system is put into a low-power state, except for memory, which is placed into the self-refresh mode to retain its contents.
To suspend to RAM:
$ echo mem > /sys/power/state
Wake up
There are many possible ways to wake up from suspend.
A few examples:
- Pushing the ON/OFF button (when present on the board)
- Pushing a button on the board which has the boolean property "gpio-key,wakeup" set in its device tree node (under gpio_keys), e.g.:
gpio-keys { compatible = "gpio-keys"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_gpio_keys>; back { label = "Back"; gpios = <&gpio5 20 GPIO_ACTIVE_LOW>; linux,code = <KEY_BACK>; gpio-key,wakeup; }; };
- Using the RTC you can wake at a specific time (see the RTC section)
Current consumption when suspended
VAR-SOM-MX6 "L" revisions (1GB RAM)
17.2mA with a 3.7V Li-Po
Warning: Only "L" (for Low-power) revisions of VAR-SOM-MX6 can be operated at 3.7V!
DART-MX6
9mA with a 3.7V Li-Po
VAR-DART-6UL
4.5mA at 3.3V
VAR-SOM-MX7
TBD