firmware: arm_scmi: Clarify raw per-channel ABI documentation
Explain more in detail how the per-channel <m> identifier is chosen. Suggested-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Link: https://lore.kernel.org/r/20230120122326.1932614-1-cristian.marussi@arm.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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@ -80,9 +80,13 @@ Description: SCMI Raw synchronous message injection/snooping facility; write
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Each write to the entry causes one command request to be built
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and sent while the replies are read back one message at time
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(receiving an EOF at each message boundary).
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Channel identifier <m> matches the SCMI protocol number which
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has been associated with this transport channel in the DT
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description, with base protocol number 0x10 being the default
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channel for this instance.
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Note that these per-channel entries rooted at <..>/channels
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exist only if the transport is configured to have more than
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one channel.
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one default channel.
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Users: Debugging, any userspace test suite
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What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_async
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@ -103,7 +107,11 @@ Description: SCMI Raw asynchronous message injection/snooping facility; write
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Each write to the entry causes one command request to be built
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and sent while the replies are read back one message at time
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(receiving an EOF at each message boundary).
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Channel identifier <m> matches the SCMI protocol number which
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has been associated with this transport channel in the DT
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description, with base protocol number 0x10 being the default
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channel for this instance.
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Note that these per-channel entries rooted at <..>/channels
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exist only if the transport is configured to have more than
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one channel.
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one default channel.
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Users: Debugging, any userspace test suite
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