[PATCH 2/2 RESEND] power: reset: Add syscon poweroff device node for APM X-Gene platform

[Tai Tri Nguyen]

Hi Dann,

On Mon, Jun 8, 2015 at 8:44 PM, Dann Frazier <dann.frazier at canonical.com> wrote:
> On Tue, Jun 2, 2015 at 1:19 PM, Tai Nguyen <ttnguyen at apm.com> wrote:
>> This patch adds syscon poweroff device node to support poweroff feature
>> on APM X-Gene Mustang platform
>
> hey Tai,
>  The reboot changes work just fine for me, but poweroff does not:
>
> [  OK  ] Reached target Final Step.
>          Starting Power-Off...
> reboot: Power down
> Unable to poweroff system
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
>
> CPU: 0 PID: 1 Comm: systemd-shutdow Tainted: G        W       4.1.0-rc7+ #1
> Hardware name: APM X-Gene Mustang board (DT)
> Call trace:
> [<ffffffc00008990c>] dump_backtrace+0x0/0x11c
> [<ffffffc000089a38>] show_stack+0x10/0x1c
> [<ffffffc0005b447c>] dump_stack+0x88/0xc8
> [<ffffffc0005b3374>] panic+0xe0/0x220
> [<ffffffc0000b5f24>] do_exit+0x990/0x994
> [<ffffffc0000d06bc>] SyS_reboot+0x14c/0x208
> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000
>
>   -dann
>

Thanks for testing my patches.
On APM X-Gene Mustang platform, power off circuit is controlled by firmware.
It requires a firmware update to support power off feature.
May I ask what firmware version you're running on?

Tai


>> Signed-off-by: Tai Nguyen <ttnguyen at apm.com>
>> ---
>>  arch/arm64/boot/dts/apm/apm-mustang.dts |   12 ++++++++++++
>>  1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/apm/apm-mustang.dts b/arch/arm64/boot/dts/apm/apm-mustang.dts
>> index 83578e7..910d561 100644
>> --- a/arch/arm64/boot/dts/apm/apm-mustang.dts
>> +++ b/arch/arm64/boot/dts/apm/apm-mustang.dts
>> @@ -23,6 +23,18 @@
>>                 device_type = "memory";
>>                 reg = < 0x1 0x00000000 0x0 0x80000000 >; /* Updated by bootloader */
>>         };
>> +
>> +       poweroff_mbox: poweroff_mbox at 10548000 {
>> +               compatible = "syscon";
>> +               reg = <0x0 0x10548000 0x0 0x30>;
>> +       };
>> +
>> +       poweroff: poweroff at 10548010 {
>> +               compatible = "syscon-poweroff";
>> +               regmap = <&poweroff_mbox>;
>> +               offset = <0x10>;
>> +               mask = <0x1>;
>> +       };
>>  };
>>
>>  &pcie0clk {
>> --
>> 1.7.9.5
>>
>>
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-- 
Tai