linux-kernel - [PATCH v5 0/4] CPUFreq: Add support for opp-sharing cpus

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Message-Id: <20201208174229.24323-1-nicola.mazzucato@arm.com>
Date:   Tue,  8 Dec 2020 17:42:25 +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
Cc:     daniel.lezcano@...aro.org, morten.rasmussen@....com,
        chris.redpath@....com, nicola.mazzucato@....com
Subject: [PATCH v5 0/4] CPUFreq: Add support for opp-sharing cpus

Hi All,

In this V5 posting I have addressed suggestions on opp/of and scmi-cpufreq
driver.

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

Many thanks,
Nicola

[v5]
  * Rework documentation of opp-shared within OPP node
  * Register EM only for the first CPU within cpumask in driver
  * Add check for nr_opp in driver before registering EM
  * Add comments on both dev_pm_opp_get_opp_count in driver
  * Remove redundant ret=0 in driver

This v5 is rebased on top of:
next-20201208 + Lukasz Luba's patches [1]

[v4]
  * Remove unconditional set of opp_table->shared_opp to exclusive
  * Add implementation for scmi-cpufreq
  * Change subject

These patches are on top of:
next-20201201 + Lukasz Luba's patches (waiting for Rafael) [1]

[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: Allow empty OPP tables
  opp/of: Allow empty opp-table with opp-shared
  scmi-cpufreq: get opp_shared_cpus from opp-v2 for EM

Sudeep Holla (1):
  cpufreq: blacklist Arm Vexpress platforms in cpufreq-dt-platdev

 Documentation/devicetree/bindings/opp/opp.txt | 54 ++++++++++++++-
 drivers/cpufreq/cpufreq-dt-platdev.c          |  2 +
 drivers/cpufreq/scmi-cpufreq.c                | 69 ++++++++++++++-----
 drivers/opp/of.c                              |  7 +-
 4 files changed, 110 insertions(+), 22 deletions(-)

[1] https://lore.kernel.org/linux-pm/20201124104346.27167-1-lukasz.luba@arm.com/

-- 
2.27.0