diff options
Diffstat (limited to 'Documentation/devicetree/bindings/display/xylon,logicvc-display.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/display/xylon,logicvc-display.yaml | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/display/xylon,logicvc-display.yaml b/Documentation/devicetree/bindings/display/xylon,logicvc-display.yaml new file mode 100644 index 000000000..fc02c5d50 --- /dev/null +++ b/Documentation/devicetree/bindings/display/xylon,logicvc-display.yaml @@ -0,0 +1,301 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2019 Bootlin +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/display/xylon,logicvc-display.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Xylon LogiCVC display controller + +maintainers: + - Paul Kocialkowski <paul.kocialkowski@bootlin.com> + +description: | + The Xylon LogiCVC is a display controller that supports multiple layers. + It is usually implemented as programmable logic and was optimized for use + with Xilinx Zynq-7000 SoCs and Xilinx FPGAs. + + Because the controller is intended for use in a FPGA, most of the + configuration of the controller takes place at logic configuration bitstream + synthesis time. As a result, many of the device-tree bindings are meant to + reflect the synthesis configuration and must not be configured differently. + Matching synthesis parameters are provided when applicable. + + Layers are declared in the "layers" sub-node and have dedicated configuration. + In version 3 of the controller, each layer has fixed memory offset and address + starting from the video memory base address for its framebuffer. In version 4, + framebuffers are configured with a direct memory address instead. + +properties: + compatible: + enum: + - xylon,logicvc-3.02.a-display + - xylon,logicvc-4.01.a-display + + reg: + maxItems: 1 + + clocks: + minItems: 1 + maxItems: 4 + + clock-names: + minItems: 1 + items: + # vclk is required and must be provided as first item. + - const: vclk + # Other clocks are optional and can be provided in any order. + - enum: + - vclk2 + - lvdsclk + - lvdsclkn + - enum: + - vclk2 + - lvdsclk + - lvdsclkn + - enum: + - vclk2 + - lvdsclk + - lvdsclkn + + interrupts: + maxItems: 1 + + memory-region: + maxItems: 1 + + xylon,display-interface: + enum: + # Parallel RGB interface (C_DISPLAY_INTERFACE == 0) + - parallel-rgb + # ITU-T BR656 interface (C_DISPLAY_INTERFACE == 1) + - bt656 + # 4-bit LVDS interface (C_DISPLAY_INTERFACE == 2) + - lvds-4bits + # 3-bit LVDS interface (C_DISPLAY_INTERFACE == 4) + - lvds-3bits + # DVI interface (C_DISPLAY_INTERFACE == 5) + - dvi + description: Display output interface (C_DISPLAY_INTERFACE). + + xylon,display-colorspace: + enum: + # RGB colorspace (C_DISPLAY_COLOR_SPACE == 0) + - rgb + # YUV 4:2:2 colorspace (C_DISPLAY_COLOR_SPACE == 1) + - yuv422 + # YUV 4:4:4 colorspace (C_DISPLAY_COLOR_SPACE == 2) + - yuv444 + description: Display output colorspace (C_DISPLAY_COLOR_SPACE). + + xylon,display-depth: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: Display output depth (C_PIXEL_DATA_WIDTH). + + xylon,row-stride: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: Fixed number of pixels in a framebuffer row (C_ROW_STRIDE). + + xylon,dithering: + $ref: "/schemas/types.yaml#/definitions/flag" + description: Dithering module is enabled (C_XCOLOR) + + xylon,background-layer: + $ref: "/schemas/types.yaml#/definitions/flag" + description: | + The last layer is used to display a black background (C_USE_BACKGROUND). + The layer must still be registered. + + xylon,layers-configurable: + $ref: "/schemas/types.yaml#/definitions/flag" + description: | + Configuration of layers' size, position and offset is enabled + (C_USE_SIZE_POSITION). + + layers: + type: object + + properties: + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + patternProperties: + "^layer@[0-9]+$": + type: object + + properties: + reg: + maxItems: 1 + + xylon,layer-depth: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: Layer depth (C_LAYER_X_DATA_WIDTH). + + xylon,layer-colorspace: + enum: + # RGB colorspace (C_LAYER_X_TYPE == 0) + - rgb + # YUV packed colorspace (C_LAYER_X_TYPE == 0) + - yuv + description: Layer colorspace (C_LAYER_X_TYPE). + + xylon,layer-alpha-mode: + enum: + # Alpha is configured layer-wide (C_LAYER_X_ALPHA_MODE == 0) + - layer + # Alpha is configured per-pixel (C_LAYER_X_ALPHA_MODE == 1) + - pixel + description: Alpha mode for the layer (C_LAYER_X_ALPHA_MODE). + + xylon,layer-base-offset: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: | + Offset in number of lines (C_LAYER_X_OFFSET) starting from the + video RAM base (C_VMEM_BASEADDR), only for version 3. + + xylon,layer-buffer-offset: + $ref: "/schemas/types.yaml#/definitions/uint32" + description: | + Offset in number of lines (C_BUFFER_*_OFFSET) starting from the + layer base offset for the second buffer used in double-buffering. + + xylon,layer-primary: + $ref: "/schemas/types.yaml#/definitions/flag" + description: | + Layer should be registered as a primary plane (exactly one is + required). + + additionalProperties: false + + required: + - reg + - xylon,layer-depth + - xylon,layer-colorspace + - xylon,layer-alpha-mode + + required: + - "#address-cells" + - "#size-cells" + - layer@0 + + additionalProperties: false + + description: | + The description of the display controller layers, containing layer + sub-nodes that each describe a registered layer. + + port: + $ref: /schemas/graph.yaml#/properties/port + description: | + Video output port, typically connected to a panel or bridge. + +additionalProperties: false + +required: + - compatible + - reg + - clocks + - clock-names + - interrupts + - xylon,display-interface + - xylon,display-colorspace + - xylon,display-depth + - xylon,row-stride + - layers + - port + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + + logicvc: logicvc@43c00000 { + compatible = "xylon,logicvc-3.02.a", "syscon", "simple-mfd"; + reg = <0x43c00000 0x6000>; + + #address-cells = <1>; + #size-cells = <1>; + + logicvc_display: display@0 { + compatible = "xylon,logicvc-3.02.a-display"; + reg = <0x0 0x6000>; + + memory-region = <&logicvc_cma>; + + clocks = <&logicvc_vclk 0>, <&logicvc_lvdsclk 0>; + clock-names = "vclk", "lvdsclk"; + + interrupt-parent = <&intc>; + interrupts = <0 34 IRQ_TYPE_LEVEL_HIGH>; + + xylon,display-interface = "lvds-4bits"; + xylon,display-colorspace = "rgb"; + xylon,display-depth = <16>; + xylon,row-stride = <1024>; + + xylon,layers-configurable; + + layers { + #address-cells = <1>; + #size-cells = <0>; + + layer@0 { + reg = <0>; + xylon,layer-depth = <16>; + xylon,layer-colorspace = "rgb"; + xylon,layer-alpha-mode = "layer"; + xylon,layer-base-offset = <0>; + xylon,layer-buffer-offset = <480>; + xylon,layer-primary; + }; + + layer@1 { + reg = <1>; + xylon,layer-depth = <16>; + xylon,layer-colorspace = "rgb"; + xylon,layer-alpha-mode = "layer"; + xylon,layer-base-offset = <2400>; + xylon,layer-buffer-offset = <480>; + }; + + layer@2 { + reg = <2>; + xylon,layer-depth = <16>; + xylon,layer-colorspace = "rgb"; + xylon,layer-alpha-mode = "layer"; + xylon,layer-base-offset = <960>; + xylon,layer-buffer-offset = <480>; + }; + + layer@3 { + reg = <3>; + xylon,layer-depth = <16>; + xylon,layer-colorspace = "rgb"; + xylon,layer-alpha-mode = "layer"; + xylon,layer-base-offset = <480>; + xylon,layer-buffer-offset = <480>; + }; + + layer@4 { + reg = <4>; + xylon,layer-depth = <16>; + xylon,layer-colorspace = "rgb"; + xylon,layer-alpha-mode = "layer"; + xylon,layer-base-offset = <8192>; + xylon,layer-buffer-offset = <480>; + }; + }; + + port { + #address-cells = <1>; + #size-cells = <0>; + + logicvc_output: endpoint@0 { + reg = <0>; + remote-endpoint = <&panel_input>; + }; + }; + }; + }; |