Re: [PATCH v2 7/8] SUPPORT.md: Describe SCMI-SMC layer feature

[Julien Grall <julien@xxxxxxx>]

Hi,

On 30/09/2024 12:47, Andrei Cherechesu (OSS) wrote:
> From: Andrei Cherechesu <andrei.cherechesu@xxxxxxx>
>
> Describe the layer which enables SCMI over SMC calls forwarding
> to EL3 FW if issued by Dom0. 
s/Dom0/Hardware domain/ and everywhere else below.

> If the SCMI firmware node is not
> found in Dom0's DT during initialization, it fails silently
> as it's not mandatory.
You are looking for the node in the host's DT.

> The SCMI SMCs trapping at EL2 now lets Dom0 perform SCMI ops for
> interacting with system-level resources almost as if it would be
> running natively.
>
> Signed-off-by: Andrei Cherechesu <andrei.cherechesu@xxxxxxx>
> ---
>   SUPPORT.md | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/SUPPORT.md b/SUPPORT.md
> index 23dd7e6424..d8ffddfc44 100644
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -927,6 +927,14 @@ Add/Remove device tree nodes using a device tree overlay 
> binary (.dtbo).
>   
>       Status: Tech Preview
>   
> +### Arm: SCMI over SMC calls forwarding to EL3 Firmware
> +
> +Enable SCMI calls using SMC as doorbell mechanism and Shared Memory for
> +transport ("arm,scmi-smc" compatible only) to reach EL3 Firmware if issued
> +by Dom0. Some platforms use SCMI for access to system-level resources.
> +
> +    Status: Supported
Bertrand, can you confirm this should be ok to support it (includingn 
security support)?
Cheers,

--
Julien Grall