# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/media/allwinner,sun4i-a10-csi.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Allwinner A10 CMOS Sensor Interface (CSI) Device Tree Bindings

maintainers:
  - Chen-Yu Tsai <wens@csie.org>
  - Maxime Ripard <mripard@kernel.org>

description: |-
  The Allwinner A10 and later has a CMOS Sensor Interface to retrieve
  frames from a parallel or BT656 sensor.

properties:
  compatible:
    oneOf:
      - const: allwinner,sun4i-a10-csi1
      - const: allwinner,sun7i-a20-csi0
      - items:
        - const: allwinner,sun7i-a20-csi1
        - const: allwinner,sun4i-a10-csi1
      - items:
        - const: allwinner,sun8i-r40-csi0
        - const: allwinner,sun7i-a20-csi0

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    oneOf:
      - items:
        - description: The CSI interface clock
        - description: The CSI DRAM clock

      - items:
        - description: The CSI interface clock
        - description: The CSI ISP clock
        - description: The CSI DRAM clock

  clock-names:
    oneOf:
      - items:
        - const: bus
        - const: ram

      - items:
        - const: bus
        - const: isp
        - const: ram

  resets:
    maxItems: 1

  # FIXME: This should be made required eventually once every SoC will
  # have the MBUS declared.
  interconnects:
    maxItems: 1

  # FIXME: This should be made required eventually once every SoC will
  # have the MBUS declared.
  interconnect-names:
    const: dma-mem

  # See ./video-interfaces.txt for details
  port:
    type: object
    additionalProperties: false

    properties:
      endpoint:
        type: object

        properties:
          bus-width:
            enum: [8, 16]

          data-active: true
          hsync-active: true
          pclk-sample: true
          remote-endpoint: true
          vsync-active: true

        required:
          - bus-width
          - data-active
          - hsync-active
          - pclk-sample
          - remote-endpoint
          - vsync-active

    required:
      - endpoint

required:
  - compatible
  - reg
  - interrupts
  - clocks

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/sun7i-a20-ccu.h>
    #include <dt-bindings/reset/sun4i-a10-ccu.h>

    csi0: csi@1c09000 {
        compatible = "allwinner,sun7i-a20-csi0";
        reg = <0x01c09000 0x1000>;
        interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&ccu CLK_AHB_CSI0>, <&ccu CLK_CSI_SCLK>, <&ccu CLK_DRAM_CSI0>;
        clock-names = "bus", "isp", "ram";
        resets = <&ccu RST_CSI0>;

        port {
            csi_from_ov5640: endpoint {
                remote-endpoint = <&ov5640_to_csi>;
                bus-width = <8>;
                hsync-active = <1>; /* Active high */
                vsync-active = <0>; /* Active low */
                data-active = <1>;  /* Active high */
                pclk-sample = <1>;  /* Rising */
            };
        };
    };

...