MX8 suspend: Difference between revisions
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There are many possible ways to wake up from suspend.<br> | There are many possible ways to wake up from suspend.<br> | ||
A few examples:<br> | A few examples:<br> | ||
* Pushing the ON/OFF button (when present on the board)<br> | |||
{{#varexists:PAD_WAKEUP_SUPPORT| | {{#varexists:PAD_WAKEUP_SUPPORT| | ||
* Pushing a button on the board which has the properties "pad-wakeup-num" and "pad-wakeup" set in its device tree node (under gpio related node), e.g.: | |||
wakeup from direct GPIOs | wakeup from direct GPIOs | ||
&lsio_gpio5 { | &lsio_gpio5 { | ||
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}; | }; | ||
* Pressing the capacitive touch which has the properties "pad-wakeup-num" and "pad-wakeup" set in its device tree node (under touch IRQ gpio related node), e.g.: | |||
&lsio_gpio1 { | &lsio_gpio1 { | ||
/* Enable wakeup-source from Capacitive touch */ | /* Enable wakeup-source from Capacitive touch */ | ||
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}; | }; | ||
| | | | ||
* Pushing a button on the board which has the boolean property "wakeup-source" set in its device tree node (under gpio_keys), e.g.: | |||
gpio-keys { | gpio-keys { | ||
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}; | }; | ||
* Touching the capacitive touchscreen which has the "wakeup-source" property set in its device tree node, e.g.: | |||
ft5x06_ts: ft5x06_ts@38 { | ft5x06_ts: ft5x06_ts@38 { | ||
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}} | }} | ||
* Pressing any key on debug console defined as wake-up source before entering suspend (see below):<br> | |||
{{#varexists:UART_CONSOLE_PATH| | {{#varexists:UART_CONSOLE_PATH| | ||
# echo enabled > {{#var:UART_CONSOLE_PATH}} | <pre># echo enabled > {{#var:UART_CONSOLE_PATH}}</pre> | ||
| | | | ||
{{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX8X| | {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX8X| | ||
# echo enabled > /sys/devices/platform/5a090000.serial/tty/ttyLP3/power/wakeup | <pre># echo enabled > /sys/devices/platform/5a090000.serial/tty/ttyLP3/power/wakeup</pre> | ||
| | | | ||
# echo enabled > /sys/devices/platform/5a060000.serial/tty/ttyLP0/power/wakeup | <pre># echo enabled > /sys/devices/platform/5a060000.serial/tty/ttyLP0/power/wakeup</pre> | ||
}} | }} | ||
}} | }} | ||
Revision as of 15:16, 2 June 2021
VAR-SOM-MX8X Suspend to RAM
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 execute the following command:
# pm-suspend
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 "wakeup-source" 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 = <&gpio4 6 GPIO_ACTIVE_LOW>;
linux,code = <KEY_BACK>;
wakeup-source;
};
};
- Touching the capacitive touchscreen which has the "wakeup-source" property set in its device tree node, e.g.:
ft5x06_ts: ft5x06_ts@38 {
status = "disabled";
compatible = "edt,edt-ft5x06";
reg = <0x38>;
reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_touch>;
interrupt-parent = <&gpio1>;
interrupts = <14 0>;
touchscreen-size-x = <800>;
touchscreen-size-y = <480>;
touchscreen-inverted-x;
touchscreen-inverted-y;
wakeup-source;
};
- Pressing any key on debug console defined as wake-up source before entering suspend (see below):
# echo enabled > /sys/devices/platform/5a090000.serial/tty/ttyLP3/power/wakeup