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firmware: arm_scmi: Clarify raw per-channel ABI documentation

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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>
This commit is contained in:
Cristian Marussi
2023-01-20 12:23:26 +00:00
committed by Sudeep Holla
parent 7860701d1e
commit 32a55bbdd7
1 changed files with 10 additions and 2 deletions
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Documentation/ABI/testing/debugfs-scmi-raw
+10 -2
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@@ -80,9 +80,13 @@ Description: SCMI Raw synchronous message injection/snooping facility; write
Each write to the entry causes one command request to be built Each write to the entry causes one command request to be built
and sent while the replies are read back one message at time and sent while the replies are read back one message at time
(receiving an EOF at each message boundary). (receiving an EOF at each message boundary).
Channel identifier <m> matches the SCMI protocol number which
has been associated with this transport channel in the DT
description, with base protocol number 0x10 being the default
channel for this instance.
Note that these per-channel entries rooted at <..>/channels Note that these per-channel entries rooted at <..>/channels
exist only if the transport is configured to have more than exist only if the transport is configured to have more than
one channel. one default channel.
Users: Debugging, any userspace test suite Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_async What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_async
@@ -103,7 +107,11 @@ Description: SCMI Raw asynchronous message injection/snooping facility; write
Each write to the entry causes one command request to be built Each write to the entry causes one command request to be built
and sent while the replies are read back one message at time and sent while the replies are read back one message at time
(receiving an EOF at each message boundary). (receiving an EOF at each message boundary).
Channel identifier <m> matches the SCMI protocol number which
has been associated with this transport channel in the DT
description, with base protocol number 0x10 being the default
channel for this instance.
Note that these per-channel entries rooted at <..>/channels Note that these per-channel entries rooted at <..>/channels
exist only if the transport is configured to have more than exist only if the transport is configured to have more than
one channel. one default channel.
Users: Debugging, any userspace test suite Users: Debugging, any userspace test suite