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-Qualcomm Shared Memory Point 2 Point binding
-
-The Shared Memory Point to Point (SMP2P) protocol facilitates communication of
-a single 32-bit value between two processors. Each value has a single writer
-(the local side) and a single reader (the remote side). Values are uniquely
-identified in the system by the directed edge (local processor ID to remote
-processor ID) and a string identifier.
-
-- compatible:
- Usage: required
- Value type: <string>
- Definition: must be one of:
- "qcom,smp2p"
-
-- interrupts:
- Usage: required
- Value type: <prop-encoded-array>
- Definition: one entry specifying the smp2p notification interrupt
-
-- mboxes:
- Usage: required
- Value type: <prop-encoded-array>
- Definition: reference to the associated doorbell in APCS, as described
- in mailbox/mailbox.txt
-
-- qcom,ipc:
- Usage: required, unless mboxes is specified
- Value type: <prop-encoded-array>
- Definition: three entries specifying the outgoing ipc bit used for
- signaling the remote end of the smp2p edge:
- - phandle to a syscon node representing the apcs registers
- - u32 representing offset to the register within the syscon
- - u32 representing the ipc bit within the register
-
-- qcom,smem:
- Usage: required
- Value type: <u32 array>
- Definition: two identifiers of the inbound and outbound smem items used
- for this edge
-
-- qcom,local-pid:
- Usage: required
- Value type: <u32>
- Definition: specifies the identifier of the local endpoint of this edge
-
-- qcom,remote-pid:
- Usage: required
- Value type: <u32>
- Definition: specifies the identifier of the remote endpoint of this edge
-
-= SUBNODES
-Each SMP2P pair contain a set of inbound and outbound entries, these are
-described in subnodes of the smp2p device node. The node names are not
-important.
-
-- qcom,entry-name:
- Usage: required
- Value type: <string>
- Definition: specifies the name of this entry, for inbound entries this
- will be used to match against the remotely allocated entry
- and for outbound entries this name is used for allocating
- entries
-
-- interrupt-controller:
- Usage: required for incoming entries
- Value type: <empty>
- Definition: marks the entry as inbound; the node should be specified
- as a two cell interrupt-controller as defined in
- "../interrupt-controller/interrupts.txt"
- If not specified this node will denote the outgoing entry
-
-- #interrupt-cells:
- Usage: required for incoming entries
- Value type: <u32>
- Definition: must be 2 - denoting the bit in the entry and IRQ flags
-
-- #qcom,smem-state-cells:
- Usage: required for outgoing entries
- Value type: <u32>
- Definition: must be 1 - denoting the bit in the entry
-
-= EXAMPLE
-The following example shows the SMP2P setup with the wireless processor,
-defined from the 8974 apps processor's point-of-view. It encompasses one
-inbound and one outbound entry:
-
-wcnss-smp2p {
- compatible = "qcom,smp2p";
- qcom,smem = <431>, <451>;
-
- interrupts = <0 143 1>;
-
- qcom,ipc = <&apcs 8 18>;
-
- qcom,local-pid = <0>;
- qcom,remote-pid = <4>;
-
- wcnss_smp2p_out: master-kernel {
- qcom,entry-name = "master-kernel";
-
- #qcom,smem-state-cells = <1>;
- };
-
- wcnss_smp2p_in: slave-kernel {
- qcom,entry-name = "slave-kernel";
-
- interrupt-controller;
- #interrupt-cells = <2>;
- };
-};