Merge tag 'scmi-updates-6.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into soc/drivers

Arm SCMI updates for v6.13

Just couple of main additions:
1. Support for variable I/O width within ARM SCMI shared memory area.

   Some shared memory areas might only support a certain access width,
   such as 32-bit, which memcpy_{from,to}_io() does not adhere to at least
   on ARM64 by making both 8-bit and 64-bit accesses to such memory.

    This support updates the shmem layer to support reading from and
    writing to such shared memory area using the specified I/O width
    in the Device Tree. The various transport layers making use of the
    shmem.c code are updated accordingly to pass the I/O accessors that
    they store. The device tree bindings are also updated for the same.

2. Extension of SCMI transport bindings to add more properties

   SCMI transports are characterized by a number of properties. The
   values assumed by some of them tightly depend on the choices taken at
   design time and on the overall archiecture of the specific platform:
   things like timeouts, maximum message size and number of in-flight
   messages are closely tied to the architecture of the platform like
   number of SCMI agents on the system, physical memory available to the
   SCMI platform and so on. Such details are not discoverable as they are
   outside the scope of the SCMI protocol specification.

   Currently such properties are simple default values defined at build
   time, but the increasing number and variety of platforms using SCMI
   with a wide range of designs has increased the need to have a way to
   describe such properties across all these platforms.

Apart from the above two, there is one NULL pointer dereference fix for
very age old SCPI protocol driver which seems to be still in use on few
platforms.

* tag 'scmi-updates-6.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_scpi: Check the DVFS OPP count returned by the firmware
  firmware: arm_scmi: Relocate atomic_threshold to scmi_desc
  firmware: arm_scmi: Use max_msg and max_msg_size devicetree properties
  dt-bindings: firmware: arm,scmi: Introduce more transport properties
  firmware: arm_scmi: Calculate virtio PDU max size dynamically
  firmware: arm_scmi: Account for SHMEM memory overhead
  firmware: arm_scmi: Support 'reg-io-width' property for shared memory
  dt-bindings: sram: Document reg-io-width property
  firmware: arm_scmi: Use vendor string in max-rx-timeout-ms
  dt-bindings: firmware: arm,scmi: Add missing vendor string
  firmware: arm_scmi: Reject clear channel request on A2P
  firmware: arm_scmi: Fix slab-use-after-free in scmi_bus_notifier()

Link: https://lore.kernel.org/r/20241106110727.4007489-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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