[PATCH v6 2/5] dt-bindings: display: xlnx: Add ZynqMP DP subsystem bindings

[Hyun Kwon <hyun.kwon@xilinx.com>]

This add a dt binding for ZynqMP DP subsystem.

Signed-off-by: Hyun Kwon <hyun.kwon@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
v6
- Add more descriptions and references
- Remove the description for child node
v4
- Specify phy related descriptions
- Specify dma related descriptions
- Remove ports
- Remove child nodes for layers
- Update the example accordingly
v2
- Group multiple ports under 'ports'
- Replace linux specific terms with generic hardware descriptions
---
---
 .../bindings/display/xlnx/xlnx,zynqmp-dpsub.txt    | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.txt

diff --git a/Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.txt b/Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.txt
new file mode 100644
index 0000000..ec8a58a
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/xlnx/xlnx,zynqmp-dpsub.txt
@@ -0,0 +1,77 @@
+Xilinx ZynqMP DisplayPort subsystem
+-----------------------------------
+
+The DisplayPort subsystem of Xilinx ZynqMP (Zynq UltraScale+ MPSoC) implements
+the display and audio pipelines based on the DisplayPort v1.2 standard.
+The subsystem includes multiple functional blocks as below:
+
+	buffer manager <-> blender & mixer <-> DP Tx
+
+The buffer manager interacts with external interface such as DMA engines or
+live streams. The blender and mixer blends the incoming video / audio streams
+into single stream. The DP Tx converts and transmits the stream into DisplayPort
+protocol through external phy. The subsystem supports 2 video and 2 audio
+streams, and various pixel formats / depths up to 4K@30 resolution.
+
+Please refer to "Zynq UltraScale+ Device Technical Reference Manual" [UG1085]
+for more details.
+
+Required properties:
+
+- compatible: Must be "xlnx,zynqmp-dpsub-1.7".
+
+- reg: Physical base address and length of the registers set for the device.
+- reg-names: Must be "dp", "blend", "av_buf", and "aud" to map logical register
+  partitions.
+
+- interrupts: Interrupt number.
+- interrupts-parent: phandle for interrupt controller.
+
+- clocks: phandles for axi, audio, non-live video, and live video clocks.
+  axi clock is required. Audio clock is optional. If not present, audio will
+  be disabled. One of non-live or live video clock should be present.
+- clock-names: The identification strings are required. "aclk" for axi clock.
+  "dp_aud_clk" for audio clock. "dp_vtc_pixel_clk_in" for non-live video clock.
+  "dp_live_video_in_clk" for live video clock (clock from programmable logic).
+
+- phys: phandles for phy specifier. The number of lanes is configurable
+  between 1 and 2. The number of phandles should be 1 or 2.
+- phy-names: The identifier strings. "dp-phy" followed by index, 0 or 1.
+  For single lane, only "dp-phy0" is required. For dual lane, both "dp-phy0"
+  and "dp-phy1" are required where "dp-phy0" is the primary lane.
+
+- power-domains: phandle for the corresponding power domain
+
+- dmas: phandles for DMA channels as defined in
+  Documentation/devicetree/bindings/dma/dma.txt.
+- dma-names: The identifier strings are required. "gfx0" for graphics layer
+  dma channel. "vid" followed by index (0 - 2) for video layer dma channels.
+
+Example:
+	zynqmp-display-subsystem@fd4a0000 {
+		compatible = "xlnx,zynqmp-dpsub-1.7";
+		reg = <0x0 0xfd4a0000 0x0 0x1000>,
+		      <0x0 0xfd4aa000 0x0 0x1000>,
+		      <0x0 0xfd4ab000 0x0 0x1000>,
+		      <0x0 0xfd4ac000 0x0 0x1000>;
+		reg-names = "dp", "blend", "av_buf", "aud";
+		interrupts = <0 119 4>;
+		interrupt-parent = <&gic>;
+
+		clock-names = "dp_apb_clk", "dp_aud_clk", "dp_live_video_in_clk";
+		clocks = <&dp_aclk>, <&clkc 17>, <&si570_1>;
+
+		phys = <&lane1>, <&lane0>;
+		phy-names = "dp-phy0", "dp-phy1";
+
+		power-domains = <&pd_dp>;
+
+		dma-names = "vid0", "vid1", "vid2", "gfx0";
+		dmas = <&xlnx_dpdma 0>,
+		       <&xlnx_dpdma 1>,
+		       <&xlnx_dpdma 2>,
+		       <&xlnx_dpdma 3>;
+	};
+};
+
+[UG1085] https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
-- 
2.7.4

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