meta-digi/meta-digi-arm/recipes-core/udev/udev-extraconf/99-ext-rtc-wakeup.rules

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# Enable external RTC as a wakeup source
SUBSYSTEM=="platform", KERNEL=="5c009000.i2c", ACTION=="add", ATTRS{power/wakeup}=="disabled", RUN+="/bin/sh -c 'echo enabled > /sys/devices/platform/soc/5c009000.i2c/power/wakeup'"
SUBSYSTEM=="platform", KERNEL=="40013000.i2c", ACTION=="add", ATTRS{power/wakeup}=="disabled", RUN+="/bin/sh -c 'echo enabled > /sys/devices/platform/soc/40013000.i2c/power/wakeup'"