drm/bridge: tc358767: Detect bridge mode from connected endpoints in DT

The TC358767/TC358867/TC9595 are all capable of operating in multiple
modes, DPI-to-(e)DP, DSI-to-(e)DP, DSI-to-DPI. Only the first mode is
currently supported. It is possible to find out the mode in which the
bridge should be operated by testing connected endpoints in DT.

Port allocation:
port@0 - DSI input
port@1 - DPI input/output
port@2 - eDP output

Possible connections:
DPI -> port@1 -> port@2 -> eDP :: [port@0 is not connected]
DSI -> port@0 -> port@2 -> eDP :: [port@1 is not connected]
DSI -> port@0 -> port@1 -> DPI :: [port@2 is not connected]

Add function to determine the bridge mode based on connected endpoints.

Reviewed-by: Lucas Stach <[email protected]>
Tested-by: Lucas Stach <[email protected]> # In both DPI to eDP and DSI to DPI mode.
Signed-off-by: Marek Vasut <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Signed-off-by: Robert Foss <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

0 files changed, 0 insertions, 0 deletions