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Document OF graph on MMSYS/VDOSYS: this supports up to three DDP paths per HW instance (so potentially up to six displays for multi-vdo SoCs). The MMSYS or VDOSYS is always the first component in the DDP pipeline, so it only supports an output port with multiple endpoints - where each endpoint defines the starting point for one of the (currently three) possible hardware paths. Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com> Tested-by: Alexandre Mergnat <amergnat@baylibre.com> Reviewed-by: CK Hu <ck.hu@mediatek.com> Tested-by: Michael Walle <mwalle@kernel.org> # on kontron-sbc-i1200 Link: https://lore.kernel.org/r/20241017103809.156056-3-angelogioacchino.delregno@collabora.com Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>