[PATCH 07/13] ARM: dts: r8a7792: initial SoC device tree

[Simon Horman]

On Fri, Jun 10, 2016 at 10:29:17PM +0300, Sergei Shtylyov wrote:
> On 06/10/2016 04:02 AM, Simon Horman wrote:
> 
> >>[...]
> >>
> >>>>>And that the system behaves sanely on suspend/resume.
> >>>>
> >>>>  I'd be thankful if you told me how to test that. :-)
> >>>
> >>>System suspend:
> >>>
> >>>   echo mem > /sys/power/state
> >>
> >>   Oh. I know that one! :-)
> >>
> >>>System resume: You're gonna need a "wakeup-source" in your DTS, e.g. gpio-keys.
> >>>Serial should work too, echo "enabled" to the corresponding wakeup
> >>>file in /sys first.
> >>
> >>   I'm afraid I couldn't find that file. All I saw were RPM controls...
> >>
> >>>In case of issues, try "echo 0 > /sys/module/printk/parameters/console_suspend".
> >>
> >>   There's no problems suspending, it's the resuming that's a problem for me.
> >>
> >>>Good luck!
> >>
> >>   As usual, there was no luck. :-)
> >>
> >>WBR, Sergei
> >
> >Does resume work for UP (i.e. without SMP)?
> 
>    No. My problem with resume is I can't wake up the remote system. I don't
> see the needed 'wakeup' file in
> /sys/devices/platform/soc/e6e60000.serial/...
>     However, if I enable CONFIG_PM_[ADVANCED_]DEBUG and do
> 
> $ echo -n core /sys/.power/pm_test
> 
> the system happily wakes up after a small delay (5 s), w/either SMP or UP kernel.

That seems promising but it seems curious that there is no wakeup file.

On Lager the following procedure works for me using
renesas-devel-20160613-v4.7-rc3 and shmobile defconfig.

0. Add wakeup-source property to serial at e6ce0000 node in DT
1. echo enabled > /sys/devices/platform/e6e60000.serial/tty/ttySC0/power/wakeup
2. echo mem > /sys/power/state
3. Provide input on serial console

* Success! *

> >How did testing CPU hotplug go? Did it work for all CPUs?
> 
>    Sure!

Great!

>    The only problem I'm seeing (again) is the RCAN clock failing to register:
> 
> rcar_gen2_cpg_clocks_init: failed to register cpg_clocks rcan clock (-12)
> 
>    I was going to look at it yesterday but (wrongly) thought it somehow
> cured itself... I'll look at it now.

Is this resolved? If not perhaps you could consider removing the node
in question for now.