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    Subject[PATCH 0/3] drivers: Frequency constraint infrastructure
    Date
    Hi,

    This commit introduces the frequency constraint infrastructure, which
    provides a generic interface for parts of the kernel to constraint the
    working frequency range of a device.

    The primary users of this are the cpufreq and devfreq frameworks. The
    cpufreq framework already implements such constraints with help of
    notifier chains (for thermal and other constraints) and some local code
    (for user-space constraints). The devfreq framework developers have also
    shown interest [1] in such a framework, which may use it at a later
    point of time.

    The idea here is to provide a generic interface and get rid of the
    notifier based mechanism.

    Only one constraint is added for now for the cpufreq framework and the
    rest will follow after this stuff is merged.

    Matthias Kaehlcke was involved in the preparation of the first draft of
    this work and so I have added him as Co-author to the first patch.
    Thanks Matthias.

    FWIW, This doesn't have anything to do with the boot-constraints
    framework [2] I was trying to upstream earlier :)

    --
    viresh

    [1] lore.kernel.org/lkml/20181002220625.GJ22824@google.com
    [2] lore.kernel.org/lkml/cover.1519380923.git.viresh.kumar@linaro.org

    Viresh Kumar (3):
    drivers: base: Add frequency constraint infrastructure
    cpufreq: Implement freq-constraint callback
    cpufreq: Implement USER constraint

    MAINTAINERS | 8 +
    drivers/base/Kconfig | 5 +
    drivers/base/Makefile | 1 +
    drivers/base/freq_constraint.c | 633 ++++++++++++++++++++++++++++++++++++++++
    drivers/cpufreq/Kconfig | 1 +
    drivers/cpufreq/cpufreq.c | 92 ++++--
    include/linux/cpufreq.h | 8 +-
    include/linux/freq_constraint.h | 45 +++
    8 files changed, 756 insertions(+), 37 deletions(-)
    create mode 100644 drivers/base/freq_constraint.c
    create mode 100644 include/linux/freq_constraint.h

    --
    2.7.4

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