- Refactor tidss_drv to improve modularity, enabling support for more
  display interfaces beyond OLDI in the future
- Add detection and initialization of active OLDI panels using the DT
- Port tidss_oldi.c from the upstream Linux kernel oldi series[0] and
  derive several APIs from it to determine the dual link pixel order
- Add tidss_oldi_init() and helper routines to handle OLDI-specific
  setup and move related helper routines to tidss_oldi.c

[0]: https://lore.kernel.org/all/20250528122544.817829-1-aradhya.bhatia@linux.dev/

Signed-off-by: Swamil Jain <s-jain1@ti.com>
Tested-by: Anshul Dalal <anshuld@ti.com>

It is confusing to have both "$(PHASE_)" and "$(XPL_)" be used in our
Makefiles as part of the macros to determine when to do something in our
Makefiles based on what phase of the build we are in. For consistency,
bring this down to a single macro and use "$(PHASE_)" only.

Signed-off-by: Tom Rini <trini@konsulko.com>

Use XPL_ as the symbol to indicate an SPL build. This means that SPL_ is
no-longer set.

Signed-off-by: Simon Glass <sjg@chromium.org>

To enable TIDSS driver only at SPL stage add rule to compile the TIDSS
video driver.

CONFIG_$(SPL_)VIDEO_TIDSS will compile tidss_drv, at SPL only if
CONFIG_SPL_VIDEO_TIDSS is defined and at u-boot proper if
CONFIG_VIDEO_TIDSS is defined.

Signed-off-by: Nikhil M Jain <n-jain1@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Added tidss video driver support which enables display
on oldi panel using AM62x, it creates a simple pipeline
framebuffer==>vidl1==>ovr1==>vp1==>oldi_panel and
calculates clock rates for panel from panel node in
device tree.

To compile TIDSS when user sets CONFIG_VIDEO_TIDSS
add rule in Makefile. Include tidss folder location
in Kconfig.

TIDSS is ported from linux kernel version 5.10.145

Signed-off-by: Nikhil M Jain <n-jain1@ti.com>