Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019 NXP
%YAML 1.2
---
$id: "http://devicetree.org/schemas/display/imx/nxp,imx8mq-dcss.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: iMX8MQ Display Controller Subsystem (DCSS)

maintainers:
  - Laurentiu Palcu <laurentiu.palcu@nxp.com>

description:

  The DCSS (display controller sub system) is used to source up to three
  display buffers, compose them, and drive a display using HDMI 2.0a(with HDCP
  2.2) or MIPI-DSI. The DCSS is intended to support up to 4kp60 displays. HDR10
  image processing capabilities are included to provide a solution capable of
  driving next generation high dynamic range displays.

properties:
  compatible:
    const: nxp,imx8mq-dcss

  reg:
    items:
      - description: DCSS base address and size, up to IRQ steer start
      - description: DCSS BLKCTL base address and size

  interrupts:
    items:
      - description: Context loader completion and error interrupt
      - description: DTG interrupt used to signal context loader trigger time
      - description: DTG interrupt for Vblank

  interrupt-names:
    items:
      - const: ctxld
      - const: ctxld_kick
      - const: vblank

  clocks:
    items:
      - description: Display APB clock for all peripheral PIO access interfaces
      - description: Display AXI clock needed by DPR, Scaler, RTRAM_CTRL
      - description: RTRAM clock
      - description: Pixel clock, can be driven either by HDMI phy clock or MIPI
      - description: DTRC clock, needed by video decompressor

  clock-names:
    items:
      - const: apb
      - const: axi
      - const: rtrm
      - const: pix
      - const: dtrc

  assigned-clocks:
    items:
      - description: Phandle and clock specifier of IMX8MQ_CLK_DISP_AXI_ROOT
      - description: Phandle and clock specifier of IMX8MQ_CLK_DISP_RTRM
      - description: Phandle and clock specifier of either IMX8MQ_VIDEO2_PLL1_REF_SEL or
                     IMX8MQ_VIDEO_PLL1_REF_SEL

  assigned-clock-parents:
    items:
      - description: Phandle and clock specifier of IMX8MQ_SYS1_PLL_800M
      - description: Phandle and clock specifier of IMX8MQ_SYS1_PLL_800M
      - description: Phandle and clock specifier of IMX8MQ_CLK_27M

  assigned-clock-rates:
    items:
      - description: Must be 800 MHz
      - description: Must be 400 MHz

  port:
    $ref: /schemas/graph.yaml#/properties/port
    description:
      A port node pointing to the input port of a HDMI/DP or MIPI display bridge.

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/imx8mq-clock.h>
    dcss: display-controller@32e00000 {
        compatible = "nxp,imx8mq-dcss";
        reg = <0x32e00000 0x2d000>, <0x32e2f000 0x1000>;
        interrupts = <6>, <8>, <9>;
        interrupt-names = "ctxld", "ctxld_kick", "vblank";
        interrupt-parent = <&irqsteer>;
        clocks = <&clk IMX8MQ_CLK_DISP_APB_ROOT>, <&clk IMX8MQ_CLK_DISP_AXI_ROOT>,
                 <&clk IMX8MQ_CLK_DISP_RTRM_ROOT>, <&clk IMX8MQ_VIDEO2_PLL_OUT>,
                 <&clk IMX8MQ_CLK_DISP_DTRC>;
        clock-names = "apb", "axi", "rtrm", "pix", "dtrc";
        assigned-clocks = <&clk IMX8MQ_CLK_DISP_AXI>, <&clk IMX8MQ_CLK_DISP_RTRM>,
                          <&clk IMX8MQ_VIDEO2_PLL1_REF_SEL>;
        assigned-clock-parents = <&clk IMX8MQ_SYS1_PLL_800M>, <&clk IMX8MQ_SYS1_PLL_800M>,
                                 <&clk IMX8MQ_CLK_27M>;
        assigned-clock-rates = <800000000>,
                               <400000000>;
        port {
            dcss_out: endpoint {
                remote-endpoint = <&hdmi_in>;
            };
        };
    };