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Qualcomm GLINK edge binding
This binding describes a Qualcomm GLINK edge, a fifo based mechanism for
communication between subsystem-pairs on various Qualcomm platforms. Two types
of edges can be described by the binding; the GLINK RPM edge and a SMEM based
edge.
- compatible:
Usage: required for glink-rpm
Value type: <stringlist>
Definition: must be "qcom,glink-rpm"
- interrupts:
Usage: required
Value type: <prop-encoded-array>
Definition: should specify the IRQ used by the remote processor to
signal this processor about communication related events
- qcom,rpm-msg-ram:
Usage: required for glink-rpm
Value type: <prop-encoded-array>
Definition: handle to RPM message memory resource
- mboxes:
Usage: required
Value type: <prop-encoded-array>
Definition: reference to the "rpm_hlos" mailbox in APCS, as described
in mailbox/mailbox.txt
= GLINK DEVICES
Each subnode of the GLINK node represent function tied to a virtual
communication channel. The name of the nodes are not important. The properties
of these nodes are defined by the individual bindings for the specific function
- but must contain the following property:
- qcom,glink-channels:
Usage: required
Value type: <stringlist>
Definition: a list of channels tied to this function, used for matching
the function to a set of virtual channels
= EXAMPLE
The following example represents the GLINK RPM node on a MSM8996 device, with
the function for the "rpm_request" channel defined, which is used for
regualtors and root clocks.
apcs_glb: mailbox@9820000 {
compatible = "qcom,msm8996-apcs-hmss-global";
reg = <0x9820000 0x1000>;
#mbox-cells = <1>;
};
rpm_msg_ram: memory@68000 {
compatible = "qcom,rpm-msg-ram";
reg = <0x68000 0x6000>;
};
rpm-glink {
compatible = "qcom,glink-rpm";
interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
qcom,rpm-msg-ram = <&rpm_msg_ram>;
mboxes = <&apcs_glb 0>;
rpm-requests {
compatible = "qcom,rpm-msm8996";
qcom,glink-channels = "rpm_requests";
...
};
};
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