42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
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Resource Power Manager(RPM)
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RPM is a dedicated hardware engine for managing shared SoC resources,
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which includes buses, clocks, power rails, etc. The goal of RPM is
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to achieve the maximum power savings while satisfying the SoC's
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operational and performance requirements. RPM accepts resource
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requests from multiple RPM masters. It arbitrates and aggregates the
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requests, and configures the shared resources. The RPM masters are
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the application processor, the modem processor, as well as hardware
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accelerators. The RPM driver communicates with the hardware engine using
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SMD.
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The devicetree representation of the SPM block should be:
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Required properties
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- compatible: "qcom,rpm-smd"
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- rpm-channel-name: The string corresponding to the channel name of the
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peripheral subsystem
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- rpm-channel-type: The interal SMD edge for this subsystem found in
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<mach/msm_smd.h>
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Optional properties
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- rpm-standlone: Allow the driver to run in standalone mode. This is a
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suggestion to the RPM driver and if the SMD
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channel is made available for RPM, the driver
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would continue to send requests to RPM processor,
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but if the SMD channel is unavailable, driver will
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return success even though the data is not sent
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to the RPM processor. In the absence of this
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option, the driver will fail if the SMD channel
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is unavailable.
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Example:
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qcom,rpm-smd {
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compatible = "qcom,rpm-smd"
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qcom,rpm-channel-name = "rpm_requests";
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qcom,rpm-channel-type = 15; /* SMD_APPS_RPM */
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}
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}
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