On Thu, Jan 19, 2023 at 12:11:34PM -0600, Rob Herring wrote:
On Thu, Jan 19, 2023 at 10:41 AM Simon Glass sjg@chromium.org wrote:
Can you add a DT node for the 'FF-A SW interfaces' and attach some sort of top-level driver to that? Perhaps simple-bus, or your own thing? You don't need to add compatible strings for subnodes (devices that are discoverable within that).
We already have that. It's just called 'arm,psci'. FF-A is not the top-level thing. SMCCC is. That's unfortunately called PSCI in DT because SMCCC grew out of PSCI. Evolution is ugly...
It's like this:
SMCCC +--PSCI +--TRNG +--FF-A +--SCMI (sometimes) +--OP-TEE +--...Whatever Arm comes up with next...
Thanks Rob for the nice description.
Hi Simon,
Though SMCCC and PSCI are kind of swapped in reality like Rob mentioned while referring to the ugly evolution, we are trying to stick with PSCI node and discovery other features dynamically in the kernel. Hope the reasons for not defining the extra unnecessary bindings for FF-A is clear now.
There are couple of other bindings IIRC, one being for the OPTEE for example which again could have been avoid if we had better idea on how these SMCCC and its users would have evolved.
-- Regards, Sudeep