linux-kernel - [PATCH v3 0/3] CPUFreq: Add support for cpu performance dependencies

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Message-Id: <20201102120115.29993-1-nicola.mazzucato@arm.com>
Date:   Mon,  2 Nov 2020 12:01:12 +0000
From:   Nicola Mazzucato <nicola.mazzucato@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        sudeep.holla@....com, rjw@...ysocki.net, vireshk@...nel.org,
        robh+dt@...nel.org, sboyd@...nel.org, nm@...com,
        daniel.lezcano@...aro.org
Cc:     morten.rasmussen@....com, chris.redpath@....com,
        nicola.mazzucato@....com
Subject: [PATCH v3 0/3] CPUFreq: Add support for cpu performance dependencies

Hi All,

In this V3 posting I have replaced the new dt-binding with minor changes/
improvements for opp (since we are now using opp tables instead).
The RFC still stands on how to make this info available to sw consumers.

In the RFC, I am proposing a simple addition of a performance dependencies
cpumask in CPUFreq core and an example of how drivers and consumers would
make use of it.
I also propose an alternative approach, which does not require changes in
CPUFreq core, but - possibly - in all the consumers.

This is to support systems where exposed cpu performance controls are more
fine-grained that the platform's ability to scale cpus independently.

[v3]
  * Remove proposal for new 'cpu-performance-dependencies' as we instead
    can reuse the opp table.
  * Update documentation for devicetree/bindings/opp
  * Minor changes within opp to support empty opp table
  * Rework the RFC by adding a second proposal

[v2]
  * Fix errors when running make dt_binding_check
  * Improve commit message description for the dt-binding
  * Add RFC for implementation in cpufreq-core and one of its
    drivers.

Nicola Mazzucato (3):
  dt-bindings/opp: Update documentation for opp-shared
  opp/of: Allow empty opp-table with opp-shared
  [RFC] CPUFreq: Add support for cpu-perf-dependencies

 Documentation/devicetree/bindings/opp/opp.txt | 53 +++++++++++++++++++
 drivers/opp/of.c                              | 13 ++++-
 2 files changed, 64 insertions(+), 2 deletions(-)

-- 
2.27.0