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media: dt-bindings: media: i2c: Add bindings for IMI RDACM2x

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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>
This commit is contained in:
Jacopo Mondi 2020-07-15 11:43:41 +02:00 committed by Mauro Carvalho Chehab
parent 66d8c9d242
commit e9f8176897
2 changed files with 161 additions and 0 deletions
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159
Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml Normal file
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# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
# Copyright (C) 2019 Renesas Electronics Corp.
%YAML 1.2
---
$id: http://devicetree.org/schemas/media/i2c/imi,rdacm2x-gmsl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: IMI D&D RDACM20 and RDACM21 Automotive Camera Platforms
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 IMI D&D RDACM20 and RDACM21 are GMSL-compatible camera designed for
automotive applications.
The RDACM20 camera module encloses a Maxim Integrated MAX9271 GMSL serializer,
coupled with an OV10635 image sensor and an embedded MCU. Both the MCU and
the image sensor are connected to the serializer local I2C bus and are
accessible by the host SoC by direct addressing.
The RDACM21 camera module encloses the same serializer, coupled with an
OV10640 image sensor and an OV490 ISP. Only the OV490 ISP is interfaced to
the serializer local I2C bus while the image sensor is not accessible from
the host SoC.
They both connect to a remote GMSL endpoint through a coaxial cable.
IMI RDACM20
+---------------+ +--------------------------------+
| GMSL | <- Video Stream | <- Video--------\ |
| |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV10635 |
| de-serializer | <- I2C messages -> | \<-->MCU |
+---------------+ +--------------------------------+
IMI RDACM21
+---------------+ +--------------------------------+
| GMSL | <- Video Stream | <- Video--------\ |
| |< === GMSL Link ====== >|MAX9271<- I2C bus-> <-->OV490 |
| | <- I2C messages -> | | |
| de-serializer | | OV10640 <-------| |
+---------------+ +--------------------------------+
Both camera modules serialize video data generated by the embedded camera
sensor on the GMSL serial channel to a remote GMSL de-serializer. They also
receive and transmit I2C messages encapsulated and transmitted on the GMSL
bidirectional control channel.
All I2C traffic received on the GMSL link not directed to the serializer is
propagated on the local I2C bus to the remote device there connected. All the
I2C traffic generated on the local I2C bus not directed to the serializer is
propagated to the remote de-serializer encapsulated in the GMSL control
channel.
The RDACM20 and RDACM21 DT node should be a direct child of the GMSL
deserializer's I2C bus corresponding to the GMSL link that the camera is
attached to.
properties:
'#address-cells':
const: 1
'#size-cells':
const: 0
compatible:
enum:
- imi,rdacm20
- imi,rdacm21
reg:
description: -|
I2C device addresses, the first to be assigned to the serializer, the
following ones to be assigned to the remote devices.
For RDACM20 the second entry of the property is assigned to the
OV10635 image sensor and the optional third one to the embedded MCU.
For RDACM21 the second entry is assigned to the OV490 ISP and the optional
third one ignored.
minItems: 2
maxItems: 3
port:
type: object
additionalProperties: false
description: -|
Connection to the remote GMSL endpoint are modelled using the OF graph
bindings in accordance with the video interface bindings defined in
Documentation/devicetree/bindings/media/video-interfaces.txt.
The device node contains a single "port" child node with a single
"endpoint" sub-device.
properties:
endpoint:
type: object
additionalProperties: false
properties:
remote-endpoint:
description: -|
phandle to the remote GMSL endpoint sub-node in the remote node
port.
maxItems: 1
required:
- remote-endpoint
required:
- endpoint
required:
- compatible
- reg
- port
examples:
- |
i2c@e66d8000 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0 0xe66d8000>;
camera@31 {
compatible = "imi,rdacm20";
reg = <0x31>, <0x41>, <0x51>;
port {
rdacm20_out0: endpoint {
remote-endpoint = <&max9286_in0>;
};
};
};
};
- |
i2c@e66d8000 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0 0xe66d8000>;
camera@31 {
compatible = "imi,rdacm21";
reg = <0x31>, <0x41>;
port {
rdacm21_out0: endpoint {
remote-endpoint = <&max9286_in0>;
};
};
};
};

2
Documentation/devicetree/bindings/vendor-prefixes.yaml
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@ -469,6 +469,8 @@ patternProperties:
description: ILI Technology Corporation (ILITEK)
"^img,.*":
description: Imagination Technologies Ltd.
"^imi,.*":
description: Integrated Micro-Electronics Inc.
"^incircuit,.*":
description: In-Circuit GmbH
"^inet-tek,.*":