From: Jakub Kicinski <kuba@kernel.org>
Date: Thu, 19 Jun 2025 02:03:02 +0000 (-0700)
Subject: Merge branch 'add-support-for-pse-budget-evaluation-strategy'
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=757639ac608e026995635740fbbb45873c4f4a18;p=thirdparty%2Fkernel%2Flinux.git

Merge branch 'add-support-for-pse-budget-evaluation-strategy'

Kory Maincent says:

====================
Add support for PSE budget evaluation strategy

This series brings support for budget evaluation strategy in the PSE
subsystem. PSE controllers can set priorities to decide which ports should
be turned off in case of special events like over-current.

This patch series adds support for two budget evaluation strategy.
1. Static Method:

   This method involves distributing power based on PD classification.
   It’s straightforward and stable, the PSE core keeping track of the
   budget and subtracting the power requested by each PD’s class.

   Advantages: Every PD gets its promised power at any time, which
   guarantees reliability.

   Disadvantages: PD classification steps are large, meaning devices
   request much more power than they actually need. As a result, the power
   supply may only operate at, say, 50% capacity, which is inefficient and
   wastes money.

2. Dynamic Method:

   To address the inefficiencies of the static method, vendors like
   Microchip have introduced dynamic power budgeting, as seen in the
   PD692x0 firmware. This method monitors the current consumption per port
   and subtracts it from the available power budget. When the budget is
   exceeded, lower-priority ports are shut down.

   Advantages: This method optimizes resource utilization, saving costs.

   Disadvantages: Low-priority devices may experience instability.

The UAPI allows adding support for software port priority mode managed from
userspace later if needed.

Patches 1-2: Add support for interrupt event report in PSE core, ethtool
	     and ethtool specs.
Patch 3: Adds support for interrupt and event report in TPS23881 driver.
Patches 4,5: Add support for PSE power domain in PSE core and ethtool.
Patches 6-8: Add support for budget evaluation strategy in PSE core,
	     ethtool and ethtool specs.
Patches 9-11: Add support for port priority and power supplies in PD692x0
	      drivers.
Patches 12,13: Add support for port priority in TPS23881 drivers.
====================

Link: https://patch.msgid.link/20250617-feature_poe_port_prio-v14-0-78a1a645e2ee@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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757639ac608e026995635740fbbb45873c4f4a18