On Fri, Jan 05, 2018 at 06:14:07PM -0800, Hyun Kwon wrote:
> 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>
> ---
> .../bindings/dma/xilinx/xilinx_dpdma.txt | 64 ++++++++++++++++++++++
> 1 file changed, 64 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt
> new file mode 100644
> index 0000000..51016d8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dpdma.txt
Use the compatible string plus .txt for the filename.
> @@ -0,0 +1,64 @@
> +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".
xlnx,zynqmp-dpdam
> + - 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".
No. This is an abuse of compatible strings.
Why do you need these? You have the DMA channel numbering fixed.
> +
> +Example:
> +
> + xlnx_dpdma: axidpdma@43c10000 {
dma-controller@
> + 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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