Sudeep, Lorenzo,

On Wed, 11 Dec 2019 at 16:43, Ulf Hansson [off-list ref] wrote:

Changes in v4:
        - Mover the check for OSI support from psci_dt_attach_cpu() to the
        caller's side of it.
        - Add comment in the code about using the deepest idle state as the
        triggering point for the domain state selection.
        - Folded in a patch to enable support for CPU hotplug.

I believe I should have addressed all your provided inputs for this
version, unless you find something new, of course.

Then, would it be possible to get your blessing for this, before
Christmas, to allow this to cook for a while in linux-next via
Rafael's tree?

Kind regards
Uffe

Changes in v3:
        - Take one step further to completely avoid executing any OSI specific
        code from the ->enter() callback, while operating in the default PSCI
        Platform Coordinated mode.
        - Update example for the PSCI DT bindings to make it compile with
        "make dt_binding_check"

Changes in v2:
        - Avoid to affect the non-OSI path with specific changes for OSI. This
        forced me to re-order the series and a caused more or less minor changes
        to most of the patches.
        - Updated the DT bindings for PSCI to clarify and to include the "psci"
        name of the PM domain to attach to.
        - Replaced patch1 with another patch from Sudeep, solving the same
        problem, but in a different way.

This series enables initial support for hierarchical CPU arrangement, managed
by PSCI and its corresponding cpuidle driver. It's based on using the generic
PM domain (genpd), which nowadays also supports devices belonging to CPUs.

The last DTS patch enables the hierarchical topology to be used for the Qcom
410c Dragonboard, which supports the PSCI OS-initiated mode.

More detailed background can be found from previous submissions [1].

The series is also available at:
git.linaro.org/people/ulf.hansson/linux-pm.git next

Kind regards
Ulf Hansson

[1]
https://lwn.net/Articles/788306/


Lina Iyer (1):
  cpuidle: dt: Support hierarchical CPU idle states

Sudeep Holla (1):
  cpuidle: psci: Align psci_power_state count with idle state count

Ulf Hansson (12):
  dt: psci: Update DT bindings to support hierarchical PSCI states
  firmware: psci: Export functions to manage the OSI mode
  of: base: Add of_get_cpu_state_node() to get idle states for a CPU
    node
  cpuidle: psci: Simplify OF parsing of CPU idle state nodes
  cpuidle: psci: Support hierarchical CPU idle states
  cpuidle: psci: Add a helper to attach a CPU to its PM domain
  cpuidle: psci: Attach CPU devices to their PM domains
  cpuidle: psci: Prepare to use OS initiated suspend mode via PM domains
  cpuidle: psci: Manage runtime PM in the idle path
  cpuidle: psci: Support CPU hotplug for the hierarchical model
  cpuidle: psci: Add support for PM domains by using genpd
  arm64: dts: Convert to the hierarchical CPU topology layout for
    MSM8916

 .../devicetree/bindings/arm/cpus.yaml         |  15 +
 .../devicetree/bindings/arm/psci.yaml         | 104 ++++++
 arch/arm64/boot/dts/qcom/msm8916.dtsi         |  57 +++-
 drivers/cpuidle/Makefile                      |   4 +-
 drivers/cpuidle/cpuidle-psci-domain.c         | 298 ++++++++++++++++++
 drivers/cpuidle/cpuidle-psci.c                | 161 ++++++++--
 drivers/cpuidle/cpuidle-psci.h                |  17 +
 drivers/cpuidle/dt_idle_states.c              |   5 +-
 drivers/firmware/psci/psci.c                  |  18 +-
 drivers/of/base.c                             |  36 +++
 include/linux/cpuhotplug.h                    |   1 +
 include/linux/of.h                            |   8 +
 include/linux/psci.h                          |   2 +
 13 files changed, 691 insertions(+), 35 deletions(-)
 create mode 100644 drivers/cpuidle/cpuidle-psci-domain.c
 create mode 100644 drivers/cpuidle/cpuidle-psci.h

--
2.17.1

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