[PATCH v11 6/7] firmware: smccc: arm-cca-guest: Bind the TSM provider to an SMCCC device

[Catalin Marinas]

On Mon, Sep 14, 2026 at 11:35:10AM +0530, Aneesh Kumar K.V (Arm) wrote:
> The Arm CCA guest TSM provider currently binds through the arm-cca-dev
> platform device. Like arm-smccc-trng, this device is not an independent
> platform resource; it is a software representation of the RSI firmware
> service discovered through SMCCC.
> 
> Move RSI discovery into the SMCCC firmware driver. When the SMCCC conduit
> is SMC and if RSI ABI version call is supported, create an arm-rsi-dev

Nit: "arm-rsi". Or did you mean to actually user "arm-rsi-dev" below?

> SMCCC device. Convert the Arm CCA guest TSM provider to an SMCCC driver so
> it binds to that discovered RSI service and keeps module autoloading
> through the SMCCC device id table.
> 
> Keep the old arm-cca-dev platform-device registration for now. Userspace
> has used that device as a Realm-guest indicator, so removing it is left to
> a follow-up patch that adds a replacement sysfs ABI.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar at kernel.org>
[...]
> @@ -94,6 +95,11 @@ static const struct smccc_device_info smccc_devices[] __initconst = {
>  		.requires_smc   = false,
>  		.device_name    = "arm-smccc-trng",
>  	},
> +	{
> +		.func_id        = SMC_RSI_ABI_VERSION,
> +		.requires_smc   = true,
> +		.device_name    = "arm-rsi",
> +	},
>  };

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>