dt-bindings: display: ti,am65x-dss: Add support for display sharing mode

commit d805270609cfb6b2e67bd2fd5959d71f48393196 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Add support for using TI Keystone DSS hardware present in display
sharing mode.

TI Keystone DSS hardware supports partitioning of resources between
multiple hosts as it provides separate register space and unique
interrupt line to each host.

The DSS hardware can be used in shared mode in such a way that
one or more of video planes can be owned by Linux wherease other planes
can be owned by remote cores.

One or more of the video ports can be dedicated exclusively to a
processing core, wherease some of the video ports can be shared between
two hosts too with only one of them having write access.

Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Reviewed-by: Aradhya Bhatia <a-bhatia1@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>