dt-bindings: soc: qcom: stats: Document compatibles with fixed offset

Document additional compatibles that can be used similarly to qcom,rpm-stats
for older RPM firmware versions that have the sleep stats at a fixed offset
rather than a dynamic one. The exact offset might vary depending on the SoC
so use SoC-specific compatible names to avoid confusion.

Cc: Maulik Shah <mkshah@codeaurora.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211119213953.31970-2-stephan@gerhold.net

Documentation/devicetree/bindings/soc/qcom/qcom-stats.yaml

@@ -21,6 +21,11 @@ properties:
     enum:
       - qcom,rpmh-stats
       - qcom,rpm-stats
+      # For older RPM firmware versions with fixed offset for the sleep stats
+      - qcom,apq8084-rpm-stats
+      - qcom,msm8226-rpm-stats
+      - qcom,msm8916-rpm-stats
+      - qcom,msm8974-rpm-stats
 
   reg:
     maxItems: 1