Bindings/media/i2c/imi,rdacm2x-gmsl.yaml

   1 # SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
   2 # Copyright (C) 2019 Renesas Electronics Corp.
   3 %YAML 1.2
   4 ---
   5 $id: http://devicetree.org/schemas/media/i2c/imi,rdacm2x-gmsl.yaml#
   6 $schema: http://devicetree.org/meta-schemas/core.yaml#
   7
   8 title: IMI D&D RDACM20 and RDACM21 Automotive Camera Platforms
   9
  10 maintainers:
  11   - Jacopo Mondi <jacopo+renesas@jmondi.org>
  12   - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
  13   - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
  14   - Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
  15
  16 description: -|
  17   The IMI D&D RDACM20 and RDACM21 are GMSL-compatible camera designed for
  18   automotive applications.
  19
  20   The RDACM20 camera module encloses a Maxim Integrated MAX9271 GMSL serializer,
  21   coupled with an OV10635 image sensor and an embedded MCU. Both the MCU and
  22   the image sensor are connected to the serializer local I2C bus and are
  23   accessible by the host SoC by direct addressing.
  24
  25   The RDACM21 camera module encloses the same serializer, coupled with an
  26   OV10640 image sensor and an OV490 ISP. Only the OV490 ISP is interfaced to
  27   the serializer local I2C bus while the image sensor is not accessible from
  28   the host SoC.
  29
  30   They both connect to a remote GMSL endpoint through a coaxial cable.
  31
  32                                                    IMI RDACM20
  33   +---------------+                        +--------------------------------+
  34   |      GMSL     |   <- Video Stream      |       <- Video--------\        |
  35   |               |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV10635 |
  36   | de-serializer |   <- I2C messages ->   |                   \<-->MCU     |
  37   +---------------+                        +--------------------------------+
  38
  39                                                    IMI RDACM21
  40   +---------------+                        +--------------------------------+
  41   |      GMSL     |   <- Video Stream      |       <- Video--------\        |
  42   |               |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV490   |
  43   |               |   <- I2C messages ->   |                          |     |
  44   | de-serializer |                        |          OV10640 <-------|     |
  45   +---------------+                        +--------------------------------+
  46
  47   Both camera modules serialize video data generated by the embedded camera
  48   sensor on the GMSL serial channel to a remote GMSL de-serializer. They also
  49   receive and transmit I2C messages encapsulated and transmitted on the GMSL
  50   bidirectional control channel.
  51
  52   All I2C traffic received on the GMSL link not directed to the serializer is
  53   propagated on the local I2C bus to the remote device there connected. All the
  54   I2C traffic generated on the local I2C bus not directed to the serializer is
  55   propagated to the remote de-serializer encapsulated in the GMSL control
  56   channel.
  57
  58   The RDACM20 and RDACM21 DT node should be a direct child of the GMSL
  59   deserializer's I2C bus corresponding to the GMSL link that the camera is
  60   attached to.
  61
  62 properties:
  63   '#address-cells':
  64     const: 1
  65
  66   '#size-cells':
  67     const: 0
  68
  69   compatible:
  70     enum:
  71       - imi,rdacm20
  72       - imi,rdacm21
  73
  74   reg:
  75     description: -|
  76       I2C device addresses, the first to be assigned to the serializer, the
  77       following ones to be assigned to the remote devices.
  78
  79       For RDACM20 the second entry of the property is assigned to the
  80       OV10635 image sensor and the optional third one to the embedded MCU.
  81
  82       For RDACM21 the second entry is assigned to the OV490 ISP and the optional
  83       third one ignored.
  84
  85     minItems: 2
  86     maxItems: 3
  87
  88   port:
  89     $ref: /schemas/graph.yaml#/properties/port
  90     description:
  91       Connection to the remote GMSL endpoint.
  92
  93 required:
  94   - compatible
  95   - reg
  96   - port
  97
  98 additionalProperties: false
  99
 100 examples:
 101   - |
 102     i2c@e66d8000 {
 103       #address-cells = <1>;
 104       #size-cells = <0>;
 105
 106       reg = <0 0xe66d8000>;
 107
 108       camera@31 {
 109         compatible = "imi,rdacm20";
 110         reg = <0x31>, <0x41>, <0x51>;
 111
 112         port {
 113           rdacm20_out0: endpoint {
 114             remote-endpoint = <&max9286_in0>;
 115           };
 116         };
 117       };
 118     };
 119
 120   - |
 121     i2c@e66d8000 {
 122       #address-cells = <1>;
 123       #size-cells = <0>;
 124
 125       reg = <0 0xe66d8000>;
 126
 127       camera@31 {
 128         compatible = "imi,rdacm21";
 129         reg = <0x31>, <0x41>;
 130
 131         port {
 132           rdacm21_out0: endpoint {
 133             remote-endpoint = <&max9286_in0>;
 134           };
 135         };
 136       };
 137     };