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scmi: Add some notes on testing to README

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Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
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Milan Zamazal 2023-09-04 11:16:32 +02:00 committed by Alex Bennée
parent 923fa4312a
commit c0a5c39b99
1 changed files with 19 additions and 1 deletions
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crates/scmi/README.md
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@ -70,7 +70,25 @@ implemented.
See source code (`scmi` crate) documentation for details and how to
add more protocols, host device bindings or other functionality.
## Kernel support for testing
## Testing
SCMI is supported only on Arm in Linux. This restriction doesn't
apply to the host, which can be any architecture as long as the guest
is Arm.
The easiest way to test it on the guest side is using the Linux SCMI
Industrial I/O driver there. If an 3-axes accelerometer or gyroscope
VirtIO SCMI device is present and the guest kernel is compiled with
`CONFIG_IIO_SCMI` enabled then the device should be available in
`/sys/bus/iio/devices/`. The vhost-device-scmi fake device is
suitable for this.
Of course, other means of accessing SCMI devices can be used too. The
following Linux kernel command line can be useful to obtain SCMI trace
information, in addition to SCMI related messages in dmesg:
`trace_event=scmi:* ftrace=function ftrace_filter=scmi*`.
### Kernel support for testing
`kernel` subdirectory contains
[instructions](kernel/iio-dummy/README.md) how to create emulated