linux-kernel - [PATCH v4 0/4] Introduce "opp-microwatt" and Energy Model from DT

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Date:   Tue,  1 Mar 2022 09:35:20 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org
Cc:     lukasz.luba@....com, dietmar.eggemann@....com,
        viresh.kumar@...aro.org, rafael@...nel.org,
        daniel.lezcano@...aro.org, nm@...com, sboyd@...nel.org,
        mka@...omium.org, dianders@...omium.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH v4 0/4] Introduce "opp-microwatt" and Energy Model from DT

Hi all,

This patch set solves a few issues:
1. It allows to register EM from DT, when the voltage information is not
   available. (Some background of the issues present on Chromebook devices
   can be checked at [1].)
2. It allows to register 'advanced' EM from the DT, which is more accurate
   and reflects total power (dynamic + static).

Implementation details:
Existing machinery in the OPP framework now handles "opp-microwatt", similarly
to "opp-microamp". It also has helper exported function to get power from OPP.
For the EM, it adds a new callback in OPP framework to use this new API and
read power while having an opp pointer. It's agreed to work with OPP-v2.

Comments, suggestions are very welcome.

changelog:
v4:
- changed calculation of power, summing add all supliers power for an opp
- added opp debugfs for u_watt
- added patternProperties in dt-bindings for this new opp-microwatt
- changed the EM opp registration flow and used one EM api registration call
- changed name of _get_opp_power() to _get_dt_power()
- removed 'advanced' word from the new paragraph and content in EM doc changes
v3 [2]

Regards,
Lukasz Luba

[1] https://lore.kernel.org/linux-pm/20220207073036.14901-2-lukasz.luba@arm.com/
[2] https://lore.kernel.org/linux-pm/20220224081131.27282-1-lukasz.luba@arm.com/

Lukasz Luba (4):
  dt-bindings: opp: Add "opp-microwatt" entry in the OPP
  OPP: Add "opp-microwatt" supporting code
  OPP: Add support of "opp-microwatt" for advanced EM registration
  Documentation: EM: Describe new registration method using DT

 .../devicetree/bindings/opp/opp-v2-base.yaml  |  23 ++++
 Documentation/power/energy-model.rst          |  10 ++
 drivers/opp/core.c                            |  25 +++++
 drivers/opp/debugfs.c                         |   3 +
 drivers/opp/of.c                              | 104 +++++++++++++++++-
 include/linux/pm_opp.h                        |  12 +-
 6 files changed, 174 insertions(+), 3 deletions(-)

-- 
2.17.1