[RFC PATCH 5/6] firmware: arm_scmi: Add raw transmission support

[Mark Brown]

On Tue, Aug 16, 2022 at 08:24:49AM +0100, Cristian Marussi wrote:
> Add SCMI Raw mode support which exposes a userspace interface rooted under
> /sys/kernel/debug/scmi_raw.

> Raw mode can be enabled/disabled at runtime via ./scmi_raw/enable.
> Once enabled, all the regular SCMI drivers activity is inhibited and a
> userspace application can then inject and read back bare SCMI messages
> writing and reading to/from ./scmi_raw/message* entries.

Is there a strong reason to have the runtime enable/disable?  Given that
this is going to be used in special kernel builds rather than something
people have as standard it feels like the transition to/from raw mode is
opening up a set of extra use cases that wouldn't normally come up for
the SCMI drivers (especially if the testing ends up leaving the firmware
in a weird state).
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