FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/media/i2c/maxim,max9286.yaml

     # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
     # Copyright (C) 2019 Renesas Electronics Corp.
     %YAML 1.2
     ---
     $id: http://devicetree.org/schemas/media/i2c/maxim,max9286.yaml#
     $schema: http://devicetree.org/meta-schemas/core.yaml#
     
     title: Maxim Integrated Quad GMSL Deserializer
     
    maintainers:
      - Jacopo Mondi <jacopo+renesas@jmondi.org>
      - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
      - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
      - Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
    
    description: |
      The MAX9286 deserializer receives video data on up to 4 Gigabit Multimedia
      Serial Links (GMSL) and outputs them on a CSI-2 D-PHY port using up to 4 data
      lanes.
    
      In addition to video data, the GMSL links carry a bidirectional control
      channel that encapsulates I2C messages. The MAX9286 forwards all I2C traffic
      not addressed to itself to the other side of the links, where a GMSL
      serializer will output it on a local I2C bus. In the other direction all I2C
      traffic received over GMSL by the MAX9286 is output on the local I2C bus.
    
    properties:
      '#address-cells':
        const: 1
    
      '#size-cells':
        const: 0
    
      compatible:
        const: maxim,max9286
    
      reg:
        description: I2C device address
        maxItems: 1
    
      poc-supply:
        description: Regulator providing Power over Coax to the cameras
    
      enable-gpios:
        description: GPIO connected to the \#PWDN pin with inverted polarity
        maxItems: 1
    
      gpio-controller: true
    
      '#gpio-cells':
        const: 2
    
      maxim,reverse-channel-microvolt:
        minimum: 30000
        maximum: 200000
        default: 170000
        description: |
          Initial amplitude of the reverse control channel, in micro volts.
    
          The initial amplitude shall be adjusted to a value compatible with the
          configuration of the connected remote serializer.
    
          Some camera modules (for example RDACM20) include an on-board MCU that
          pre-programs the embedded serializer with power supply noise immunity
          (high-threshold) enabled. A typical value of the deserializer's reverse
          channel amplitude to communicate with pre-programmed serializers is
          170000 micro volts.
    
          A typical value for the reverse channel amplitude to communicate with
          a remote serializer whose high-threshold noise immunity is not enabled
          is 100000 micro volts
    
      maxim,gpio-poc:
        $ref: '/schemas/types.yaml#/definitions/uint32-array'
        minItems: 2
        maxItems: 2
        description: |
          Index of the MAX9286 gpio output line (0 or 1) that controls Power over
          Coax to the cameras and its associated polarity flag.
    
          The property accepts an array of two unsigned integers, the first being
          the gpio line index (0 or 1) and the second being the gpio line polarity
          flag (GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW) as defined in
          <include/dt-bindings/gpio/gpio.h>.
    
          When the remote cameras power is controlled by one of the MAX9286 gpio
          lines, this property has to be used to specify which line among the two
          available ones controls the remote camera power enablement.
    
          When this property is used it is not possible to register a gpio
          controller as the gpio lines are controlled directly by the MAX9286 and
          not available for consumers, nor the 'poc-supply' property should be
          specified.
    
      ports:
        $ref: /schemas/graph.yaml#/properties/ports
    
        properties:
          port@0:
           $ref: /schemas/graph.yaml#/properties/port
           description: GMSL Input 0
   
         port@1:
           $ref: /schemas/graph.yaml#/properties/port
           description: GMSL Input 1
   
         port@2:
           $ref: /schemas/graph.yaml#/properties/port
           description: GMSL Input 2
   
         port@3:
           $ref: /schemas/graph.yaml#/properties/port
           description: GMSL Input 3
   
         port@4:
           $ref: /schemas/graph.yaml#/$defs/port-base
           unevaluatedProperties: false
           description: CSI-2 Output
   
           properties:
             endpoint:
               $ref: /schemas/media/video-interfaces.yaml#
               unevaluatedProperties: false
   
               properties:
                 data-lanes: true
   
               required:
                 - data-lanes
   
       required:
         - port@4
   
     i2c-mux:
       type: object
       $ref: /schemas/i2c/i2c-mux.yaml#
       unevaluatedProperties: false
       description: |
         Each GMSL link is modelled as a child bus of an i2c bus multiplexer/switch.
   
       patternProperties:
         "^i2c@[0-3]$":
           type: object
           description: |
             Child node of the i2c bus multiplexer which represents a GMSL link.
             Each serializer device on the GMSL link remote end is represented with
             an i2c-mux child node. The MAX9286 chip supports up to 4 GMSL
             channels.
   
           properties:
             reg:
               description: The index of the GMSL channel.
               maxItems: 1
   
           patternProperties:
             "^camera@[a-f0-9]+$":
               type: object
               description: |
                 The remote camera device, composed by a GMSL serializer and a
                 connected video source.
   
               properties:
                 compatible:
                   description: The remote device compatible string.
   
                 reg:
                   minItems: 2
                   maxItems: 3
                   description: |
                     The I2C addresses to be assigned to the remote devices through
                     address reprogramming. The number of entries depends on the
                     requirements of the currently connected remote device.
   
                 port:
                   $ref: /schemas/graph.yaml#/properties/port
                   description: Connection to the MAX9286 sink.
   
               required:
                 - compatible
                 - reg
                 - port
   
               additionalProperties: false
   
   required:
     - compatible
     - reg
     - ports
     - i2c-mux
   
   # If 'maxim,gpio-poc' is present, then 'poc-supply' and 'gpio-controller'
   # are not allowed.
   if:
     required:
       - maxim,gpio-poc
   then:
     properties:
       poc-supply: false
       gpio-controller: false
   
   additionalProperties: false
   
   examples:
     - |
       #include <dt-bindings/gpio/gpio.h>
   
       i2c@e66d8000 {
           #address-cells = <1>;
           #size-cells = <0>;
   
           reg = <0 0xe66d8000>;
   
           gmsl-deserializer@2c {
               compatible = "maxim,max9286";
               reg = <0x2c>;
               poc-supply = <&camera_poc_12v>;
               enable-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
   
               gpio-controller;
               #gpio-cells = <2>;
   
               maxim,reverse-channel-microvolt = <170000>;
   
               ports {
                   #address-cells = <1>;
                   #size-cells = <0>;
   
                   port@0 {
                       reg = <0>;
   
                       max9286_in0: endpoint {
                           remote-endpoint = <&rdacm20_out0>;
                       };
                   };
   
                   port@1 {
                       reg = <1>;
   
                       max9286_in1: endpoint {
                           remote-endpoint = <&rdacm20_out1>;
                       };
                   };
   
                   port@2 {
                       reg = <2>;
   
                       max9286_in2: endpoint {
                           remote-endpoint = <&rdacm20_out2>;
                       };
                   };
   
                   port@3 {
                       reg = <3>;
   
                       max9286_in3: endpoint {
                           remote-endpoint = <&rdacm20_out3>;
                       };
                   };
   
                   port@4 {
                       reg = <4>;
   
                       max9286_out: endpoint {
                           data-lanes = <1 2 3 4>;
                           remote-endpoint = <&csi40_in>;
                       };
                   };
               };
   
               i2c-mux {
                   #address-cells = <1>;
                   #size-cells = <0>;
   
                   i2c@0 {
                       #address-cells = <1>;
                       #size-cells = <0>;
                       reg = <0>;
   
                       camera@51 {
                           compatible = "imi,rdacm20";
                           reg = <0x51>, <0x61>;
   
                           port {
                               rdacm20_out0: endpoint {
                                   remote-endpoint = <&max9286_in0>;
                               };
                           };
   
                       };
                   };
   
                   i2c@1 {
                       #address-cells = <1>;
                       #size-cells = <0>;
                       reg = <1>;
   
                       camera@52 {
                           compatible = "imi,rdacm20";
                           reg = <0x52>, <0x62>;
   
                           port {
                               rdacm20_out1: endpoint {
                                   remote-endpoint = <&max9286_in1>;
                               };
                           };
                       };
                   };
   
                   i2c@2 {
                       #address-cells = <1>;
                       #size-cells = <0>;
                       reg = <2>;
   
                       camera@53 {
                           compatible = "imi,rdacm20";
                           reg = <0x53>, <0x63>;
   
                           port {
                               rdacm20_out2: endpoint {
                                   remote-endpoint = <&max9286_in2>;
                               };
                           };
                       };
                   };
   
                   i2c@3 {
                       #address-cells = <1>;
                       #size-cells = <0>;
                       reg = <3>;
   
                       camera@54 {
                           compatible = "imi,rdacm20";
                           reg = <0x54>, <0x64>;
   
                           port {
                               rdacm20_out3: endpoint {
                                   remote-endpoint = <&max9286_in3>;
                               };
                           };
                       };
                   };
               };
           };
   
           /*
           * Example of a deserializer that controls the camera Power over Coax
           * through one of its gpio lines.
           */
           gmsl-deserializer@6c {
               compatible = "maxim,max9286";
               reg = <0x6c>;
               enable-gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
   
               /*
               * The remote camera power is controlled by MAX9286 GPIO line #0.
               * No 'poc-supply' nor 'gpio-controller' are specified.
               */
               maxim,gpio-poc = <0 GPIO_ACTIVE_LOW>;
   
               /*
               * Do not describe connections as they're the same as in the previous
               * example.
               */
               ports {
                   #address-cells = <1>;
                   #size-cells = <0>;
   
                   port@4 {
                       reg = <4>;
                   };
               };
   
               i2c-mux {
                   #address-cells = <1>;
                   #size-cells = <0>;
               };
           };
       };

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