linux-kernel - [PATCH v7 0/3] PM / Domains: Add support for 'required-opps' to set default perf state

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Date:   Thu, 12 Aug 2021 16:57:19 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     ulf.hansson@...aro.org, bjorn.andersson@...aro.org,
        viresh.kumar@...aro.org
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        swboyd@...omium.org, rojay@...eaurora.org, stephan@...hold.net,
        digetx@...il.com, Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH v7 0/3] PM / Domains: Add support for 'required-opps' to set default perf state

v7: Added a patch to remove error print in case required-opps is missing
    of_get_required_opp_performance_state() called without parsing for required-opps
    Check and handle error from dev_pm_genpd_set_performance_state()
    genpd_remove_device() on error

v6: Fixed up some more error handling in __genpd_dev_pm_attach()

v5: Dropped all default_pstate handling in runtime suspend/resume

v4: Fixed error handling in __genpd_dev_pm_attach()

This is a re-spin of the series [1] which was adding support for a new
DT binding (assigned-performance-state) and based on the discussions on
that thread [2] it was concluded that we could achieve the same with the
existing 'required-opps' binding instead.

So this series, just drops the new binding and uses required-opps to achieve
the default perf state setting thats needed by some devices.

---
Some devics within power-domains with performance states do not
support DVFS, but still need to vote on a default/static state
while they are active. Add support for this using the 'required-opps'
property in device tree.

[1] https://lore.kernel.org/patchwork/project/lkml/list/?series=501336&state=%2A&archive=both
[2] https://lore.kernel.org/patchwork/patch/1436886/

Rajendra Nayak (3):
  opp: Don't print an error if required-opps is missing
  PM / Domains: Add support for 'required-opps' to set default perf
    state
  arm64: dts: sc7180: Add required-opps for i2c

 arch/arm64/boot/dts/qcom/sc7180.dtsi | 24 ++++++++++++++++++++++++
 drivers/base/power/domain.c          | 29 +++++++++++++++++++++++++++--
 drivers/opp/of.c                     | 12 ++----------
 include/linux/pm_domain.h            |  1 +
 4 files changed, 54 insertions(+), 12 deletions(-)

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