The ZynqMP includes the DisplayPort subsystem with its own DMA engine
called DPDMA. The DPDMA IP comes with 6 individual channels
(4 for display, 2 for audio). This documentation describes DT bindings
of DPDMA.
Signed-off-by: Hyun Kwon <hyun.kwon@xxxxxxxxxx>
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
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diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt
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+Device-Tree bindings for Xilinx ZynqMP DP Subsystem DMA
+
+The ZynqMP DisplayPort subsystem handles DMA channel buffer management,
+blending, and audio mixing. The DisplayPort subsystem receives display
+and audio frames from DPDMA and transmits output to the DisplayPort IP core.
+
+Required properties:
+ - compatible: Should be "xlnx,dpdma".
+ - reg: Base address and size of the IP core.
+ - interrupts: Interrupt number.
+ - interrupts-parent: phandle for interrupt controller.
+ - clocks: phandle for AXI clock
+ - clock-names: The identification string, "axi_clk", is always required.
+
+Required child node properties:
+- compatible: Should be one of "xlnx,video0", "xlnx,video1", "xlnx,video2",
+ "xlnx,graphics", "xlnx,audio0", or "xlnx,audio1".
+
+Example:
+
+ xlnx_dpdma: axidpdma@43c10000 {
+ compatible = "xlnx,dpdma";
+ reg = <0x43c10000 0x1000>;
+ interrupts = <0 54 4>;
+ interrupt-parent = <&intc>;
+ clocks = <&clkc 16>;
+ clock-names = "axi_clk";
+
+ #dma-cells = <1>;
+ dma-video0channel {
+ compatible = "xlnx,video0";
+ };
+ dma-video1channel {
+ compatible = "xlnx,video1";
+ };
+ dma-video2channel {
+ compatible = "xlnx,video2";
+ };
+ dma-graphicschannel {
+ compatible = "xlnx,graphics";
+ };
+ dma-audio0channel {
+ compatible = "xlnx,audio0";
+ };
+ dma-audio1channel {
+ compatible = "xlnx,audio1";
+ };
+ };
+
+* DMA client
+
+Required properties:
+- dmas: a list of <[DPDMA device phandle] [Channel ID]> pairs. "Channel ID"
+ is defined as video0 = 0, video1 = 1, video2 = 2, graphics = 3, audio0 = 4,
+ and audio1 = 5.
+
+Example:
+
+ xlnx_drm {
+ ...
+ dmas = <&xlnx_dpdma 3>;
+ dma-names = "dma";
+ ...
+ };
--
2.7.4
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