90 lines
2.4 KiB
Plaintext
90 lines
2.4 KiB
Plaintext
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"
|
|
|
|
- label:
|
|
Usage: optional
|
|
Value type: <string>
|
|
Definition: should specify the subsystem name this edge corresponds to.
|
|
|
|
- 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
|
|
|
|
- qcom,intents:
|
|
Usage: optional
|
|
Value type: <prop-encoded-array>
|
|
Definition: a list of size,amount pairs describing what intents should
|
|
be preallocated for this virtual channel. This can be used
|
|
to tweak the default intents available for the channel to
|
|
meet expectations of the remote.
|
|
|
|
= 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";
|
|
|
|
qcom,intents = <0x400 5
|
|
0x800 1>;
|
|
...
|
|
};
|
|
};
|