Re: [PATCH] modify pl011 driver to work as wakeup source

[Sudeep Holla <sudeep.holla@arm.com>]

On 27/08/15 09:25, Zhaoyang Huang wrote:
> Sudeep,
> Have you check if the pl011 can wakeup the system. I notice that the
> calling of dev_pm_set_wake_irq can set the node of <device>/power/wakeup
> to be enabled but can not wakeup the system.
>

Yes I did, and it does wakeup the system.

> By basic debugging, I find that when calling of dev_pm_set_wake_irq
> within pl011_probe, the real device which we operate is the
> /sys/devices/platform/7ff80000.uart instead of the ttyAMA0.
>

No, if you are expecting the wakeup by sending some character on the
console, then it's ttyAMA0 which uses the pl011 UART. May be you can
also generate wakeup by toggling RTS/CTS hardware flow signals.

> By checking the sysfs, I find that the value of
> "sys/devices/platform/7ff80000.uart/power/wakeup" is "enabled", which
> can also prove above information. However, the value of
> "dev.power.wakeup->wakeirq->irq" for uart is 24 which is the same with
> ttyAMA0.

Ah, you need to use /sys/class/tty/ttyAMA0/power/wakeup

Regards,
Sudeep