qcom,fastrpc.txt

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    1 Qualcomm Technologies, Inc. FastRPC Driver
    2 
    3 The FastRPC implements an IPC (Inter-Processor Communication)
    4 mechanism that allows for clients to transparently make remote method
    5 invocations across DSP and APPS boundaries. This enables developers
    6 to offload tasks to the DSP and free up the application processor for
    7 other tasks.
    8 
    9 - compatible:
   10         Usage: required
   11         Value type: <stringlist>
   12         Definition: must be "qcom,fastrpc"
   13 
   14 - label
   15         Usage: required
   16         Value type: <string>
   17         Definition: should specify the dsp domain name this fastrpc
   18         corresponds to. must be one of this: "adsp", "mdsp", "sdsp", "cdsp"
   19 
   20 - qcom,non-secure-domain:
   21         Usage: required
   22         Value type: <boolean>
   23         Definition: Property to specify that dsp domain is non-secure.
   24 
   25 - qcom,vmids:
   26         Usage: optional
   27         Value type: <u32 array>
   28         Definition: Virtual machine IDs for remote processor.
   29 
   30 - #address-cells
   31         Usage: required
   32         Value type: <u32>
   33         Definition: Must be 1
   34 
   35 - #size-cells
   36         Usage: required
   37         Value type: <u32>
   38         Definition: Must be 0
   39 
   40 = COMPUTE BANKS
   41 Each subnode of the Fastrpc represents compute context banks available
   42 on the dsp.
   43 - All Compute context banks MUST contain the following properties:
   44 
   45 - compatible:
   46         Usage: required
   47         Value type: <stringlist>
   48         Definition: must be "qcom,fastrpc-compute-cb"
   49 
   50 - reg
   51         Usage: required
   52         Value type: <u32>
   53         Definition: Context Bank ID.
   54 
   55 - qcom,nsessions:
   56         Usage: Optional
   57         Value type: <u32>
   58         Defination: A value indicating how many sessions can share this
   59                     context bank. Defaults to 1 when this property
   60                     is not specified.
   61 
   62 Example:
   63 
   64 adsp-pil {
   65         compatible = "qcom,msm8996-adsp-pil";
   66         ...
   67         smd-edge {
   68                 label = "lpass";
   69                 fastrpc {
   70                         compatible = "qcom,fastrpc";
   71                         qcom,smd-channels = "fastrpcsmd-apps-dsp";
   72                         label = "adsp";
   73                         #address-cells = <1>;
   74                         #size-cells = <0>;
   75 
   76                         cb@1 {
   77                                 compatible = "qcom,fastrpc-compute-cb";
   78                                 reg = <1>;
   79                         };
   80 
   81                         cb@2 {
   82                                 compatible = "qcom,fastrpc-compute-cb";
   83                                 reg = <2>;
   84                         };
   85                         ...
   86                 };
   87         };
   88 };

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