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Compared to legacy booting, we don't have wake-up events enabled
for device tree based booting. This means that if deeper idle
states are enabled, the device won't wake up to UART events and
seems like it has hung.
Let's fix that by adding the wake-up interrupt. Note that we
don't need to set the PIN_OFF_WAKEUPENABLE any longer, that's
handled by the wake-up interrupt when the serial driver does
request_irq on it.
Tested with the following on omap3-overo-summit that has the
ES2.1 omap:
#!/bin/bash
uarts=$(find /sys/class/tty/ttyO*/device/power/ -type d)
for uart in $uarts; do
echo 3000 > $uart/autosuspend_delay_ms
done
uarts=$(find /sys/class/tty/ttyO*/power/ -type d)
for uart in $uarts; do
echo enabled > $uart/wakeup
echo auto > $uart/control
done
echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode
# grep -i uart /proc/interrupts
90: 1085 INTC 74 OMAP UART2
338: 5 pinctrl 366 OMAP UART2
# grep ^core_pwrdm /sys/kernel/debug/pm_debug/count
core_pwrdm (ON),OFF:1654,RET:131,INA:39,ON:1825...
Signed-off-by: Tony Lindgren <tony@atomide.com>
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