drm/sun4i: tcon: Find matching display backend by device node matching
With Allwinner's Display Engine 1.0, each TCON's input is tied to a specific display backend, and the 2 comprise what is known as a crtc in DRM KMS land: The layer, framebuffer, and compositing functions are provided by the backend, while the TCON provides the display timing signals and vblank interrupts. This 1 to 1 relationship is represented in the device tree. On some systems there is an intermediate DRC component. Pointers to both matching components must be provided when initializing the crtc. As the backend is always registered before the associated tcon, we can recursively search upwards through the of_graph to find the matching backend. Signed-off-by:Chen-Yu Tsai <wens@csie.org> Signed-off-by:
Maxime Ripard <maxime.ripard@free-electrons.com>
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