Re: [PATCH v13 6/8] firmware: smccc: arm-cca-guest: Bind the TSM provider to an SMCCC device

On 23/09/2026 15:04, 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 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.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jonathan Cameron <redacted>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Sudeep Holla <sudeep.holla@kernel.org>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>