linux-phytec-ti

mailbox/omap: add support for TI K3 SoCs

The TI K3 AM65x family of SoCs have a new Mailbox IP that is based
on the existing Mailbox IP present in OMAP architecture based SoCs.
Each instance of the legacy OMAP Mailbox IP is now a single cluster
within the newer Mailbox IP instance on K3 architecture based SoCs.
A single K3 Mailbox IP instance has multiple clusters with each
cluster providing the same functionality as the existing OMAP
Mailbox IP.

Reuse the existing OMAP Mailbox driver to extend the support for
this newer IP present within the Main NavSS block on K3 SoCs. The
K3 family of SoCs use 64-bit ARMv8 processors for running Linux,
so the driver is also enhanced to deal with the differences between
the 32-bit message payloads and the 64-bit pointers used by the
client drivers.

Signed-off-by: Suman Anna <s-anna@ti.com>