qcom,glink.txt

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    1 Qualcomm GLINK edge binding
    2 
    3 This binding describes a Qualcomm GLINK edge, a fifo based mechanism for
    4 communication between subsystem-pairs on various Qualcomm platforms. Two types
    5 of edges can be described by the binding; the GLINK RPM edge and a SMEM based
    6 edge.
    7 
    8 - compatible:
    9         Usage: required for glink-rpm
   10         Value type: <stringlist>
   11         Definition: must be "qcom,glink-rpm"
   12 
   13 - label:
   14         Usage: optional
   15         Value type: <string>
   16         Definition: should specify the subsystem name this edge corresponds to.
   17 
   18 - interrupts:
   19         Usage: required
   20         Value type: <prop-encoded-array>
   21         Definition: should specify the IRQ used by the remote processor to
   22                     signal this processor about communication related events
   23 
   24 - qcom,remote-pid:
   25         Usage: required for glink-smem
   26         Value type: <u32>
   27         Definition: specifies the identifier of the remote endpoint of this edge
   28 
   29 - qcom,rpm-msg-ram:
   30         Usage: required for glink-rpm
   31         Value type: <prop-encoded-array>
   32         Definition: handle to RPM message memory resource
   33 
   34 - mboxes:
   35         Usage: required
   36         Value type: <prop-encoded-array>
   37         Definition: reference to the "rpm_hlos" mailbox in APCS, as described
   38                     in mailbox/mailbox.txt
   39 
   40 = GLINK DEVICES
   41 Each subnode of the GLINK node represent function tied to a virtual
   42 communication channel. The name of the nodes are not important. The properties
   43 of these nodes are defined by the individual bindings for the specific function
   44 - but must contain the following property:
   45 
   46 - qcom,glink-channels:
   47         Usage: required
   48         Value type: <stringlist>
   49         Definition: a list of channels tied to this function, used for matching
   50                     the function to a set of virtual channels
   51 
   52 - qcom,intents:
   53         Usage: optional
   54         Value type: <prop-encoded-array>
   55         Definition: a list of size,amount pairs describing what intents should
   56                     be preallocated for this virtual channel. This can be used
   57                     to tweak the default intents available for the channel to
   58                     meet expectations of the remote.
   59 
   60 = EXAMPLE
   61 The following example represents the GLINK RPM node on a MSM8996 device, with
   62 the function for the "rpm_request" channel defined, which is used for
   63 regulators and root clocks.
   64 
   65         apcs_glb: mailbox@9820000 {
   66                 compatible = "qcom,msm8996-apcs-hmss-global";
   67                 reg = <0x9820000 0x1000>;
   68 
   69                 #mbox-cells = <1>;
   70         };
   71 
   72         rpm_msg_ram: memory@68000 {
   73                 compatible = "qcom,rpm-msg-ram";
   74                 reg = <0x68000 0x6000>;
   75         };
   76 
   77         rpm-glink {
   78                 compatible = "qcom,glink-rpm";
   79 
   80                 interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
   81 
   82                 qcom,rpm-msg-ram = <&rpm_msg_ram>;
   83 
   84                 mboxes = <&apcs_glb 0>;
   85 
   86                 rpm-requests {
   87                         compatible = "qcom,rpm-msm8996";
   88                         qcom,glink-channels = "rpm_requests";
   89 
   90                         qcom,intents = <0x400 5
   91                                         0x800 1>;
   92                         ...
   93                 };
   94         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/soc/qcom/qcom,glink.txt

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sys/contrib/device-tree/Bindings/soc/qcom/qcom,glink.txt