Documentation/devicetree/bindings/misc/qcom,fastrpc.txt

   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 - #address-cells
  21         Usage: required
  22         Value type: <u32>
  23         Definition: Must be 1
  24
  25 - #size-cells
  26         Usage: required
  27         Value type: <u32>
  28         Definition: Must be 0
  29
  30 = COMPUTE BANKS
  31 Each subnode of the Fastrpc represents compute context banks available
  32 on the dsp.
  33 - All Compute context banks MUST contain the following properties:
  34
  35 - compatible:
  36         Usage: required
  37         Value type: <stringlist>
  38         Definition: must be "qcom,fastrpc-compute-cb"
  39
  40 - reg
  41         Usage: required
  42         Value type: <u32>
  43         Definition: Context Bank ID.
  44
  45 - qcom,nsessions:
  46         Usage: Optional
  47         Value type: <u32>
  48         Defination: A value indicating how many sessions can share this
  49                     context bank. Defaults to 1 when this property
  50                     is not specified.
  51
  52 Example:
  53
  54 adsp-pil {
  55         compatible = "qcom,msm8996-adsp-pil";
  56         ...
  57         smd-edge {
  58                 label = "lpass";
  59                 fastrpc {
  60                         compatible = "qcom,fastrpc";
  61                         qcom,smd-channels = "fastrpcsmd-apps-dsp";
  62                         label = "adsp";
  63                         #address-cells = <1>;
  64                         #size-cells = <0>;
  65
  66                         cb@1 {
  67                                 compatible = "qcom,fastrpc-compute-cb";
  68                                 reg = <1>;
  69                         };
  70
  71                         cb@2 {
  72                                 compatible = "qcom,fastrpc-compute-cb";
  73                                 reg = <2>;
  74                         };
  75                         ...
  76                 };
  77         };
  78 };