One question is regarding of PECI driver.

[Jae Hyun Yoo]

On 6/14/2019 2:24 AM, Derek Lin23 wrote:
> Hi team:
> 
>            We have a question for PECI driver, hope we can have some 
> inputs and feedbacks.
> 
>            When PECI driver starts, it checks the availabilities for 
> CPUs by the addresses defining in the device tree.

Yes, it's what PECI driver does.

>            But, when none of the CPUs are available, in our cases, CPUs 
> are powered off, PECI driver responses with error messages of PECI 
> clients and devices are not registered.

It's an expected result because PECI works only when the host CPU is
powered on.

>            Is it possible that PECI driver would listen the events for 
> power-on? So, PECI driver would be reloaded and PECI clients and devices 
> become available.

No. Instead, we are using CPU ping from user space and register PECI
clients at run time. Please check these services:

https://github.com/openbmc/dbus-sensors
https://github.com/openbmc/entity-manager

Thanks,
Jae

>            Or, other thoughts and ideas?
> 
> Thank you,
> 
> 
> Derek Lin
>