linux-phytec-ti

dt-bindings: soc: ti: Add TI PRUSS bindings

This patch adds the bindings for the Programmable Real-Time Unit
and Industrial Communication Subsystem (PRU-ICSS) present on various
TI SoCs. The IP is present on multiple TI SoC architecture families
including the OMAP architecture SoCs such as AM33xx, AM437x and
AM57xx; and on a Keystone 2 architecture based 66AK2G SoC. It is
also present on the Davinci based OMAPL138 SoCs and K3 architecture
based AM65x SoCs as well (not covered for now).

The IP has a number of sub-modules some of which have their own
devices. This binding covers only the top-level sub-system devices,
and some sub-modules like MDIO, MII_RT and IEP. The remaining
sub-modules bindings shall be defined in the respective driver
subsystem bindings folders. Couple of full examples have also
been added demonstrating the devices on AM335x and the unique
configuration on AM437x SoCs.

The binding status is also marked as unstable as the binding does
not cover all the sub-modules that are present within the PRU-ICSS.

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