media: dt-bindings: media: i2c: Add bindings for IMI RDACM2x
The IMI RDACM20 and IMI RDACM21 are Gigabit Multimedia Serial Link (GMSL) camera capable of transmitting video and I2C control messages on a coax cable physical link for automotive applications. Document their device tree bindings. Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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Jacopo Mondi
Mauro Carvalho Chehab
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# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
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# Copyright (C) 2019 Renesas Electronics Corp.
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/media/i2c/imi,rdacm2x-gmsl.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: IMI D&D RDACM20 and RDACM21 Automotive Camera Platforms
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maintainers:
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- Jacopo Mondi <jacopo+renesas@jmondi.org>
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- Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
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- Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
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- Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
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description: -|
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The IMI D&D RDACM20 and RDACM21 are GMSL-compatible camera designed for
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automotive applications.
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The RDACM20 camera module encloses a Maxim Integrated MAX9271 GMSL serializer,
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coupled with an OV10635 image sensor and an embedded MCU. Both the MCU and
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the image sensor are connected to the serializer local I2C bus and are
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accessible by the host SoC by direct addressing.
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The RDACM21 camera module encloses the same serializer, coupled with an
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OV10640 image sensor and an OV490 ISP. Only the OV490 ISP is interfaced to
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the serializer local I2C bus while the image sensor is not accessible from
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the host SoC.
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They both connect to a remote GMSL endpoint through a coaxial cable.
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IMI RDACM20
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+---------------+ +--------------------------------+
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| GMSL | <- Video Stream | <- Video--------\ |
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| |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV10635 |
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| de-serializer | <- I2C messages -> | \<-->MCU |
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+---------------+ +--------------------------------+
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IMI RDACM21
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+---------------+ +--------------------------------+
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| GMSL | <- Video Stream | <- Video--------\ |
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| |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV490 |
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| | <- I2C messages -> | | |
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| de-serializer | | OV10640 <-------| |
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+---------------+ +--------------------------------+
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Both camera modules serialize video data generated by the embedded camera
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sensor on the GMSL serial channel to a remote GMSL de-serializer. They also
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receive and transmit I2C messages encapsulated and transmitted on the GMSL
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bidirectional control channel.
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All I2C traffic received on the GMSL link not directed to the serializer is
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propagated on the local I2C bus to the remote device there connected. All the
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I2C traffic generated on the local I2C bus not directed to the serializer is
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propagated to the remote de-serializer encapsulated in the GMSL control
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channel.
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The RDACM20 and RDACM21 DT node should be a direct child of the GMSL
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deserializer's I2C bus corresponding to the GMSL link that the camera is
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attached to.
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properties:
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'#address-cells':
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const: 1
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'#size-cells':
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const: 0
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compatible:
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enum:
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- imi,rdacm20
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- imi,rdacm21
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reg:
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description: -|
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I2C device addresses, the first to be assigned to the serializer, the
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following ones to be assigned to the remote devices.
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For RDACM20 the second entry of the property is assigned to the
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OV10635 image sensor and the optional third one to the embedded MCU.
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For RDACM21 the second entry is assigned to the OV490 ISP and the optional
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third one ignored.
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minItems: 2
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maxItems: 3
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port:
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type: object
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additionalProperties: false
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description: -|
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Connection to the remote GMSL endpoint are modelled using the OF graph
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bindings in accordance with the video interface bindings defined in
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Documentation/devicetree/bindings/media/video-interfaces.txt.
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The device node contains a single "port" child node with a single
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"endpoint" sub-device.
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properties:
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endpoint:
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type: object
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additionalProperties: false
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properties:
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remote-endpoint:
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description: -|
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phandle to the remote GMSL endpoint sub-node in the remote node
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port.
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maxItems: 1
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required:
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- remote-endpoint
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required:
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- endpoint
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required:
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- compatible
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- reg
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- port
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examples:
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- |
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i2c@e66d8000 {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0 0xe66d8000>;
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camera@31 {
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compatible = "imi,rdacm20";
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reg = <0x31>, <0x41>, <0x51>;
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port {
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rdacm20_out0: endpoint {
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remote-endpoint = <&max9286_in0>;
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};
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};
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};
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};
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- |
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i2c@e66d8000 {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0 0xe66d8000>;
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camera@31 {
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compatible = "imi,rdacm21";
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reg = <0x31>, <0x41>;
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port {
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rdacm21_out0: endpoint {
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remote-endpoint = <&max9286_in0>;
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};
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};
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};
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};
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@ -469,6 +469,8 @@ patternProperties:
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description: ILI Technology Corporation (ILITEK)
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"^img,.*":
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description: Imagination Technologies Ltd.
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"^imi,.*":
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description: Integrated Micro-Electronics Inc.
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"^incircuit,.*":
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description: In-Circuit GmbH
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"^inet-tek,.*":
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