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dt-bindings: firmware: arm,scmi: Add support for notification completion channel

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Per System Control Management Interface specification:
"Completion interrupts: This transport supports polling or interrupt driven
 modes of communication. In interrupt mode, when the callee completes
 processing a message, it raises an interrupt to the caller. Hardware
 support for completion interrupts is optional."

So, add an optional mailbox channel for notification completion interrupts.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240510-scmi-notify-v2-1-e994cf14ef86@nxp.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Peng Fan
2024-05-10 11:19:47 +08:00
committed by Sudeep Holla
parent dd22cc907a
commit d0398f51ff
1 changed files with 8 additions and 4 deletions
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12
Documentation/devicetree/bindings/firmware/arm,scmi.yaml
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@@ -72,14 +72,17 @@ properties:
- const: tx
- const: tx_reply
- const: rx
- const: rx_reply
minItems: 2
mboxes:
description:
List of phandle and mailbox channel specifiers. It should contain
exactly one, two or three mailboxes; the first one or two for transmitting
messages ("tx") and another optional ("rx") for receiving notifications
and delayed responses, if supported by the platform.
exactly one, two, three or four mailboxes; the first one or two for
transmitting messages ("tx") and another optional ("rx") for receiving
notifications and delayed responses, if supported by the platform.
The optional ("rx_reply") is for notifications completion interrupt,
if supported by the platform.
The number of mailboxes needed for transmitting messages depends on the
type of channels exposed by the specific underlying mailbox controller;
one single channel descriptor is enough if such channel is bidirectional,
@@ -92,9 +95,10 @@ properties:
2 mbox / 2 shmem => SCMI TX and RX over 2 mailbox bidirectional channels
2 mbox / 1 shmem => SCMI TX over 2 mailbox unidirectional channels
3 mbox / 2 shmem => SCMI TX and RX over 3 mailbox unidirectional channels
4 mbox / 2 shmem => SCMI TX and RX over 4 mailbox unidirectional channels
Any other combination of mboxes and shmem is invalid.
minItems: 1
maxItems: 3
maxItems: 4
shmem:
description: