12v slot AC Support in x86-power-control

P. Priyatharshan PriyatharshanP at hcl.com
Fri Oct 9 00:13:49 AEDT 2020

Thanks Vijay/Patrick for your comments.

The feature we are working is different from vijay's feature.

Out platform is multi host system and we  have the host as FRU and it can be plugged in to a slot. The slot has an option to control slot power and this can be used for a AC cycle.

We proposed  a design to add the slot power control in the x86-power-control.The earlier discussion can be found in the below link.


ed tanous,

I will create a clear document on when to use this slot power control feature.

Priyatharshan P

From: Vijay Khemka <vijaykhemka at fb.com>
Sent: 08 October 2020 06:11
To: P. Priyatharshan <PriyatharshanP at hcl.com>; openbmc at lists.ozlabs.org <openbmc at lists.ozlabs.org>; ed at tanous.net <ed at tanous.net>
Cc: Velumani T-ERS,HCLTech <velumanit at hcl.com>
Subject: Re: 12v slot AC Support in x86-power-control

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Hi Priyatharshan,

Chassis system reset is for removing AC power for the whole chassis and it is already supported in x86-power-control. I am working on enabling this feature in redfish. I am not sure how it is related to your new features. If it is related then you can also define system_reset target unit.



From: "P. Priyatharshan" <PriyatharshanP at hcl.com>
Date: Tuesday, October 6, 2020 at 9:43 AM
To: "openbmc at lists.ozlabs.org" <openbmc at lists.ozlabs.org>, Vijay Khemka <vijaykhemka at fb.com>, "ed at tanous.net" <ed at tanous.net>
Cc: "Velumani T-ERS,HCLTech" <velumanit at hcl.com>
Subject: 12v slot AC Support in x86-power-control

Hi Vijay,

I am working on a patch to support  12v slot AC cycle in x86-power-control.This can be enabled by configuring slotACPowerName in json config file.Since you are also working on similar kind of feature in x86-power-control, I would like bring up this discussion on mailing list to understand how these two features, and the design you proposed for chassis reset are intended to work together.Kindly go through my design changes below and share your thoughts.

I have modified the existing /xyz/openbmc_project/state/chassis0 object to implement 12V On, Off, and Power Cycle for system which has 12V Slot power support.

If slotACPowerName is disabled and if,

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.Off" then poweroff [existing functionality not changed]

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.On" then powerOn [existing functionality not changed]

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.PowerCycle" then PowerCycle [existing functionality not changed]

events will be called.

If slotACPowerName is enabled and if,

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.Off" then 12V Ac Slot Off

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.On" then 12V Ac Slot On

RequestedPowerTransition = "xyz.openbmc_project.State.Chassis.Transition.PowerCycle" then 12V Ac Slot PowerCycle

events will be called.


Priyatharshan P



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