36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
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Command DB
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---------
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Command DB is a database that provides a mapping between resource key and
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the resource address for a system resource managed by RPMh. The data is
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stored in a shared memory region and is loaded by the remote processor.
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Some of the "Qualcomm Technologies Inc" SOC's have hardware accelerators
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for controlling shared resources. The HW accelerator associated to a given
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resource could change between builds when accelerators are added/removed.
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To remove dependencies between multiple images in a SoC, Command DB allows
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drivers to query resource parameters based on predetermined key strings.
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The devicetree representation of the command DB driver should be:
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PROPERTIES:
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- compatible:
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Usage: required
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Value type: <string>
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Definition: Should be "qcom,cmd-db"
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- reg:
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Usage: required
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Value type: <prop-encoded-array>
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Definition: First element is the base address of shared memory
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Second element is the size of the shared memory region
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Points to the dictionary address that houses the command DB
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start address and the size of the command DB region
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Example:
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qcom,cmd-db@861e0000 {
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compatible = "qcom,cmd-db";
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reg = <0xc3f000c 0x8>;
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}
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