Energy counters for PMBUS

Energy counters for PMBUS

[zlukwins]

Hi,


I am OpenBMC FW developer. We have a use cases which require PSU devices 
energy counters reading. Looks like hwmon:pmbus does not support that 
right now.

Hwmon sysfs 
(https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface) already 
supports energy counter (energy[1-*]_input).

PMBus standard (revision 1.3.1) provides API for getting energy - 
READ_EIN/READ_EOUT commands.

So I am wondering whether we could just add this implementation to the 
hwmon/pmbus/pmbus_core.c? Or maybe there are some constraints?


Thanks

Zbigniew

Re: Energy counters for PMBUS

[Guenter Roeck]

On Fri, Apr 02, 2021 at 03:19:40PM +0200, zlukwins wrote:
> Hi,
> 
> 
> I am OpenBMC FW developer. We have a use cases which require PSU devices
> energy counters reading. Looks like hwmon:pmbus does not support that right
> now.
> 
> Hwmon sysfs (https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface)
> already supports energy counter (energy[1-*]_input).
> 
> PMBus standard (revision 1.3.1) provides API for getting energy -
> READ_EIN/READ_EOUT commands.
> 
> So I am wondering whether we could just add this implementation to the
> hwmon/pmbus/pmbus_core.c? Or maybe there are some constraints?
> 

Sure, go ahead. The only reason for not implementing it was that I did
not have access to a chip supporting it when I wrote the code.

Guenter