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What for? >>>>> >>>>> What is canvas provider? >>>> The canvas provider is: drivers/soc/amlogic/meson-canvas.c >>> What is this "canvas" device. >> You can think of canvas as the agent through which the decoder hardware >> accesses DDR. > AGAIN: > > What is the canvas device. Describe or point me to bindings describing > it. Your current bindings say that canvas is "a collection of metadata > that describes a pixel buffer" so there is no way it handles DDR access. > > NAK I will rewrite this description based on your feedback after I thoroughly understand the role of the canvas device. >>>> In short, canvas is a hardware IP inside the Amlogic SoC. The decoder IP >>>> needs to access DDR through canvas IP, so we need to reference the >>> Why decoder cannot access DDR directly? >> The internal topology of the S4 chip is designed this way, we don't know >> why our VLSI colleauges designed like this. But similar designs have >> been removed in subsequent chips, eliminating the need to rely on a >> common hardware IP. > Quite poor explanation. Based on this, this as well could be entry in > device reg lists. > > Anyway, I am done guessing, explain properly the hardware instead of > answering with half-baked responses just so I will go away. Okay, please give me some time and I'll ask our colleagues about this.  I you reply you basedon this message then. > Best regards, > Krzysztof BRs Zhentao