1 Qualcomm GLINK edge binding
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
9 Usage: required for glink-rpm
10 Value type: <stringlist>
11 Definition: must be "qcom,glink-rpm"
16 Definition: should specify the subsystem name this edge corresponds to.
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
25 Usage: required for glink-rpm
26 Value type: <prop-encoded-array>
27 Definition: handle to RPM message memory resource
31 Value type: <prop-encoded-array>
32 Definition: reference to the "rpm_hlos" mailbox in APCS, as described
33 in mailbox/mailbox.txt
36 Each subnode of the GLINK node represent function tied to a virtual
37 communication channel. The name of the nodes are not important. The properties
38 of these nodes are defined by the individual bindings for the specific function
39 - but must contain the following property:
41 - qcom,glink-channels:
43 Value type: <stringlist>
44 Definition: a list of channels tied to this function, used for matching
45 the function to a set of virtual channels
49 Value type: <prop-encoded-array>
50 Definition: a list of size,amount pairs describing what intents should
51 be preallocated for this virtual channel. This can be used
52 to tweak the default intents available for the channel to
53 meet expectations of the remote.
56 The following example represents the GLINK RPM node on a MSM8996 device, with
57 the function for the "rpm_request" channel defined, which is used for
58 regualtors and root clocks.
60 apcs_glb: mailbox@9820000 {
61 compatible = "qcom,msm8996-apcs-hmss-global";
62 reg = <0x9820000 0x1000>;
67 rpm_msg_ram: memory@68000 {
68 compatible = "qcom,rpm-msg-ram";
69 reg = <0x68000 0x6000>;
73 compatible = "qcom,glink-rpm";
75 interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
77 qcom,rpm-msg-ram = <&rpm_msg_ram>;
79 mboxes = <&apcs_glb 0>;
82 compatible = "qcom,rpm-msm8996";
83 qcom,glink-channels = "rpm_requests";
85 qcom,intents = <0x400 5