[PATCH v2 2/2] arm64: Add architecture specific ACPI FFH Opregion callbacks

[Will Deacon]

On Thu, Nov 10, 2022 at 01:45:05PM +0000, Sudeep Holla wrote:
> FFH Operation Region space can be used to trigger SMC or HVC calls,
> using the Arm SMC Calling Convention (SMCCC). The choice of conduit
> (SMC or HVC) is based on what the kernel choose based on PSCI as with
> any other users of SMCCC within the kernel.
> 
> Function identifiers only in the SMCCC SiP Service, OEM Service and FF-A
> specific call range are allowed in FFH Opregions.
> 
> Offset can be either 0(32 bit calling convention) or 1(64 bit calling
> convention). The length must be set with the range applicable based
> on the value of the offset.
> 
> Acked-by: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
> ---
> Hi Will,
> 
> Catalin had acked the changes to be routed via PM tree for last or the
> one previous merge window. Since we were waiting for ACPICA changes, it
> was not merged. Now that ACPICA changes are queued(via PM tree), I will
> ask Rafael to take these patches now. Just thought I will let you know
> since you are handling upcoming merge window and I do see few ACPI related
> changes there. I don't see any conflict with this, so it should be fine.
> 
> Please let me know if you are fine with that and ack is an add-on :).

I'm happy either way, so I'll leave this for Rafael but just poke me if you
want me to queue them instead.

Will