[v6,0/5] Implement SPM/SAW for MSM8998 and SDM6xx

Changes in v6:
- Moved cpuidle_driver to be private to cpuidle-qcom-spm (unused in spm.c),
  now we are assigning the cpuidle_driver structure fields inside of the
  spm_cpuidle_register function; this also fixes the cpumask assignment
  issue from v5
- Fixed another contamination from 2/3 in 1/3 (argh!! :])
- Added dt-bindings documentation for the SPM driver

Changes in v5:
- Fixed contamination from patch 2/3 in patch 1/3
- Fixed missing bits in cpuidle-qcom-spm (thanks Stephan)

Changes in v4:
- Huge patch series has been split for better reviewability,
  as suggested by Bjorn

Changes in v3:
- Rebased (no changes - was in previous series' v3)

Changes in v2:
- Fixed MSM8998 SAW parameters on SPM driver

Tested on the following smartphones:
- Sony Xperia XA2        (SDM630)
- Sony Xperia XA2 Ultra  (SDM630)
- Sony Xperia 10         (SDM630)
- Sony Xperia XZ Premium (MSM8998)
- F(x)Tec Pro 1          (MSM8998)

This is a component that we can find on very old
chips, like MSM8974; there, it has been used to actually do the
power scaling basically "on its own" - sending the cores in a specific
sleep mode to save power.
On the newer ones, including MSM8998, SDM630, 660 and others, it is still
present! Though, this time, it's being used for the cluster caches and it
has a different firmware (and maybe it's also slightly different HW),
implementing the SAWv4.1 set and getting controlled *not by the OS* but
by other controllers in the SoC (like the OSM).

Contrary from MSM8974 and the like, this new version of the SPM just
requires us to set the initial parameters for AVS and *nothing else*, as
its states will be totally managed internally.


AngeloGioacchino Del Regno (5):
  cpuidle: qcom_spm: Detach state machine from main SPM handling
  dt-bindings: soc: qcom: Add devicetree binding for QCOM SPM
  soc: qcom: spm: Implement support for SAWv4.1, SDM630/660 L2 AVS
  soc: qcom: spm: Add compatible for MSM8998 SAWv4.1 L2
  dt-bindings: soc: qcom: spm: Document SDM660 and MSM8998 compatibles

 .../bindings/soc/qcom/qcom,spm.yaml           |  77 +++++
 drivers/cpuidle/Kconfig.arm                   |   1 +
 drivers/cpuidle/cpuidle-qcom-spm.c            | 324 ++++--------------
 drivers/soc/qcom/Kconfig                      |   9 +
 drivers/soc/qcom/Makefile                     |   1 +
 drivers/soc/qcom/spm.c                        | 240 +++++++++++++
 include/soc/qcom/spm.h                        |  43 +++
 7 files changed, 446 insertions(+), 249 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
 create mode 100644 drivers/soc/qcom/spm.c
 create mode 100644 include/soc/qcom/spm.h

On Mon, 21 Jun 2021 20:10:13 +0200, AngeloGioacchino Del Regno wrote:
> Add devicetree binding for Qualcomm Subsystem Power Manager (SPM).

> 

> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>

> ---

>  .../bindings/soc/qcom/qcom,spm.yaml           | 55 +++++++++++++++++++

>  1 file changed, 55 insertions(+)

>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml

> 


My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/soc/qcom/qcom,spm.example.dt.yaml: power-controller@f9089000: compatible: ['qcom,msm8974-saw2-v2.1-cpu', 'qcom,saw2'] is too long
	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/soc/qcom/qcom,spm.example.dt.yaml: power-controller@f9089000: compatible: Additional items are not allowed ('qcom,saw2' was unexpected)
	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/soc/qcom/qcom,spm.yaml
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/soc/qcom/qcom,spm.example.dt.yaml: power-controller@f9089000: '#power-domain-cells' is a required property
	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/power/power-domain.yaml
Documentation/devicetree/bindings/soc/qcom/qcom,spm.example.dt.yaml:0:0: /example-0/power-controller@f9089000: failed to match any schema with compatible: ['qcom,msm8974-saw2-v2.1-cpu', 'qcom,saw2']
\ndoc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/1495264

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.