| Command DB |
| --------- |
| |
| Command DB is a database that provides a mapping between resource key and |
| the resource address for a system resource managed by RPMh. The data is |
| stored in a shared memory region and is loaded by the remote processor. |
| |
| Some of the "Qualcomm Technologies Inc" SOC's have hardware accelerators |
| for controlling shared resources. The HW accelerator associated to a given |
| resource could change between builds when accelerators are added/removed. |
| To remove dependencies between multiple images in a SoC, Command DB allows |
| drivers to query resource parameters based on predetermined key strings. |
| |
| The devicetree representation of the command DB driver should be: |
| |
| PROPERTIES: |
| - compatible: |
| Usage: required |
| Value type: <string> |
| Definition: Should be "qcom,cmd-db" |
| |
| - reg: |
| Usage: required |
| Value type: <prop-encoded-array> |
| Definition: First element is the base address of shared memory |
| Second element is the size of the shared memory region |
| |
| Example: |
| |
| qcom,cmd-db@861e0000 { |
| compatible = "qcom,cmd-db"; |
| reg = <0x861e0000 0x4000>; |
| } |