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Add DPU dark-mode definition for SmartSwitch PMON #1818

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Add DPU dark-mode definition for SmartSwitch PMON #1818

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7 changes: 5 additions & 2 deletions doc/smart-switch/pmon/smartswitch-pmon.md
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Expand Up @@ -74,11 +74,14 @@ The picture below highlights the PMON vertical and its association with other lo
#### Use case
* Switch: Day0 setup, Maintenance, RMA
* DPU: Day0, Day1-N Provisioning, Maintenance, RMA
#### DPU dark mode
* When a DPU is in dark mode, it remains powered down and does not consume any power.
* Dark mode is enabled by default, but can be configured through the platform's config_db if needed.
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It will be appropriate to say "When a DPU is in dark mode, it remains powered down and does not consume power"
"Dark mode is enabled by default, but the platform can be configure to boot in light up mode with one or more DPUs"

#### DPU cold startup Sequence
* The chassis is powered up and the host is booting up.
* The switch PMON is registered with the configDB state change handler.
* DPU "admin_status: up" is set in the configDB. When not explicitly configured the default is "up".
* The switch PMON gets the admin up notification from the configDB
* If the DPU's "admin_status: down" in the configDB, the DPU will remain powered down. The default setting is "down".
* If the DPU "admin_status: up" is set in the configDB, the switch PMON receives an admin-up notification from the configDB.
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If the DPU "admin_status: up" or if "admin_status: down" is not configured in the configDB, the switch PMON receives an admin-up notification from the configDB.

* The switch PMON invokes the platform API to power on the DPU
* DPU boots up and attaches itself to the midplane.
* Once SONiC is up, the state progression is updated for every state transition on the DPU_STATE table in the chassisStateDB
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