[PATCH v2 0/3] Add subsystem LPM stats support for Shikra

[Sneh Mankad <sneh.mankad@oss.qualcomm.com>]

SoC LPM stats are present in RPM MSGRAM and subsystem LPM stats are
present in SMEM for Shikra.

For earlier targets using RPM processor like msm8974, rpm_master_stat.c
was used for subsystem LPM stats since those stats were populated in
RPM MSGRAM.

Here is a brief summary of previous targets and their stats configuration,
along with the drivers used to display them.

+---------------|----------------------------|---------------------------+
| SoC           | subsystem LPM stats        | SoC LPM stats             |
|---------------|----------------------------|---------------------------|
| msm8974,      | RPM processor MSGRAM       | RPM processor MSGRAM      |
| msm8226       | (rpm_master_stat.c)        | (qcom_stats.c)            |
|---------------|----------------------------|---------------------------|
| sm6350,       | SMEM (DDR)                 | AOP processor MSGRAM      |
| sdm845, etc.  | (qcom_stats.c)             | (qcom_stats.c)            |
|---------------|----------------------------|---------------------------|
| Shikra        | SMEM (DDR)                 | RPM processor MSGRAM      |
|               | (qcom_stats.c)             | (qcom_stats.c)            |
+---------------|----------------------------|---------------------------+

qcom_stats.c supports both the configurations for shikra, reading subsystem
LPM stats from SMEM and reading SoC LPM stats from RPM MSGRAM.

A generic "qcom,rpm-stats" compatible only reads SoC LPM stats like vmin
and vlow. Add shikra rpm compatible and config to read subsystem LPM
stats too along with SoC LPM stats.

Below is an example showing LPM stats for "apss" subsystem with this
change:

cat /sys/kernel/debug/qcom_stats/apss
Count: 2192
Last Entered At: 5498618336
Last Exited At: 5498708046
Accumulated Duration: 2046572620.

Signed-off-by: Sneh Mankad <sneh.mankad@oss.qualcomm.com>
---
Changes in v2:
- Edited commit texts to better explain the changes.
- Link to v1: https://lore.kernel.org/r/20260703-shikra_stats-v1-0-0aa0ec1fa83e@oss.qualcomm.com

---
Sneh Mankad (3):
      dt-bindings: soc: qcom: stats: Add compatible for Shikra
      soc: qcom: stats: Add stats compatible and config for Shikra
      arm64: dts: qcom: shikra: Update rpm-stats compatible to SoC specific

 Documentation/devicetree/bindings/soc/qcom/qcom-stats.yaml | 1 +
 arch/arm64/boot/dts/qcom/shikra.dtsi                       | 2 +-
 drivers/soc/qcom/qcom_stats.c                              | 9 +++++++++
 3 files changed, 11 insertions(+), 1 deletion(-)
---
base-commit: 4c9d9db1697a873f78d236b4ce304272206238ac
change-id: 20260624-shikra_stats-3f01f136fb4c

Best regards,
-- 
Sneh Mankad <sneh.mankad@oss.qualcomm.com>