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| author | Emmanuel Vadot <manu@FreeBSD.org> | 2023-08-09 13:31:58 +0000 |
|---|---|---|
| committer | Emmanuel Vadot <manu@FreeBSD.org> | 2023-08-09 13:31:58 +0000 |
| commit | c47d0ea183983e0631f8cc41e9d25e4854368a0a (patch) | |
| tree | 329e5cd35d28aea1a42c6228cb539abaddf662a2 /Bindings/firmware/arm,scmi.yaml | |
| parent | 4a8223f297bb7dff7a684da702777d7e94d054fe (diff) | |
| download | src-c47d0ea183983e0631f8cc41e9d25e4854368a0a.tar.gz src-c47d0ea183983e0631f8cc41e9d25e4854368a0a.zip | |
Diffstat (limited to 'Bindings/firmware/arm,scmi.yaml')
| -rw-r--r-- | Bindings/firmware/arm,scmi.yaml | 48 |
1 files changed, 38 insertions, 10 deletions
diff --git a/Bindings/firmware/arm,scmi.yaml b/Bindings/firmware/arm,scmi.yaml index 2f7c51c75e85..5824c43e9893 100644 --- a/Bindings/firmware/arm,scmi.yaml +++ b/Bindings/firmware/arm,scmi.yaml @@ -56,17 +56,38 @@ properties: description: Specifies the mailboxes used to communicate with SCMI compliant firmware. - items: - - const: tx - - const: rx + oneOf: + - items: + - const: tx + - const: rx + minItems: 1 + - items: + - const: tx + - const: tx_reply + - const: rx + minItems: 2 mboxes: description: List of phandle and mailbox channel specifiers. It should contain - exactly one or two mailboxes, one for transmitting messages("tx") - and another optional for receiving the notifications("rx") if supported. + 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. + 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, + while two channel descriptors are needed to represent the SCMI ("tx") + channel if the underlying mailbox channels are of unidirectional type. + The effective combination in numbers of mboxes and shmem descriptors let + the SCMI subsystem determine unambiguosly which type of SCMI channels are + made available by the underlying mailbox controller and how to use them. + 1 mbox / 1 shmem => SCMI TX over 1 mailbox bidirectional channel + 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 + Any other combination of mboxes and shmem is invalid. minItems: 1 - maxItems: 2 + maxItems: 3 shmem: description: @@ -228,13 +249,20 @@ $defs: maxItems: 1 mbox-names: - items: - - const: tx - - const: rx + oneOf: + - items: + - const: tx + - const: rx + minItems: 1 + - items: + - const: tx + - const: tx_reply + - const: rx + minItems: 2 mboxes: minItems: 1 - maxItems: 2 + maxItems: 3 shmem: minItems: 1 |