dt: psci: Update DT bindings to support hierarchical PSCI states
Update PSCI DT bindings to allow to represent idle states for CPUs and the CPU topology, by using a hierarchical layout. Primarily this is done by re-using the existing DT bindings for PM domains [1] and for PM domain idle states [2]. Let's also add an example into the document for the PSCI DT bindings, to clearly show the new hierarchical based layout. The currently supported flattened layout, is already described in the ARM idle states bindings [3], so let's leave that as is. [1] Documentation/devicetree/bindings/power/power_domain.txt [2] Documentation/devicetree/bindings/power/domain-idle-state.txt [3] Documentation/devicetree/bindings/arm/idle-states.txt Co-developed-by: Lina Iyer <lina.iyer@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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