Introduce SoC sleep stats driver

Qualcomm Technologies Inc's (QTI) chipsets support SoC level low power modes. SoCs Always On Processor/Resource Power Manager produces statistics of the SoC sleep modes involving lowering or powering down of the backbone rails - Cx and Mx and the oscillator clock, XO.

Statistics includes SoC sleep mode type, number of times LPM entered, time of last entry, exit, and accumulated sleep duration.

This series adds a driver to read the stats produced by remote processor and exports using sysfs.

Maulik Shah (2):
dt-bindings: Introduce soc sleep stats bindings for Qualcomm SoCs
drivers: qcom: Add SoC sleep stats driver

 .../bindings/soc/qcom/soc-sleep-stats.txt     |  36 +++
 drivers/soc/qcom/Kconfig                      |   9 +
 drivers/soc/qcom/Makefile                     |   1 +
 drivers/soc/qcom/soc_sleep_stats.c            | 249 ++++++++++++++++++
 4 files changed, 295 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/soc-sleep-stats.txt
 create mode 100644 drivers/soc/qcom/soc_sleep_stats.c

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