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dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement

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Add description clarifying that for Versal IPI mailboxes, both host and
remote agents must have the "msg" register region defined for successful
message passing. Without both, only notification-based communication
works.

Signed-off-by: Harini T <harini.t@amd.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
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Harini T 2026-01-09 11:52:59 +05:30 committed by Jassi Brar
parent 6acf50c7f0
commit dac2b98ede
1 changed files with 11 additions and 0 deletions
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11
Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml
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@ -11,6 +11,17 @@ description: |
messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI
agent owns registers used for notification and buffers for message.
For Versal devices, there are two types of IPI channels:
- Buffered channels: Support message passing and require the "msg"
register region to be present on both the host and remote IPI agents.
- Buffer-less channels: Support notification only and do not require the
"msg" register region. For these channels, the "msg" region should be
omitted.
For message passing, both the host and remote IPI agents must define the "msg"
register region. If either agent omits the "msg" region, only notification
based communication is possible.
+-------------------------------------+
| Xilinx ZynqMP IPI Controller |
+-------------------------------------+