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Date: Wed, 29 Apr 2020 20:44:03 -0500
From: Rob Herring <robh@...nel.org>
To: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Kieran Bingham <kieran.bingham@...asonboard.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Jacopo Mondi <jacopo@...ndi.org>,
Niklas Söderlund
<niklas.soderlund@...natech.se>, sakari.ailus@....fi,
Hans Verkuil <hverkuil@...all.nl>,
Hyun Kwon <hyunk@...inx.com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Jacopo Mondi <jacopo+renesas@...ndi.org>
Subject: Re: [PATCH v8 3/4] dt-bindings: media: i2c: Add bindings for IMI
RDACM2x
On Fri, Apr 17, 2020 at 11:34:23AM +0100, Kieran Bingham wrote:
> From: Jacopo Mondi <jacopo+renesas@...ndi.org>
>
> 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@...ndi.org>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> ---
> v2:
> - Provide imi vendor prefix
> - Fix minor spelling
>
> v3:
> - update binding descriptions
>
> v4:
> - No change
>
> v5:
> - Specify optional third reg address for the MCU
>
> v7:
> [Jacopo]
> - Rename to imi,rdacm2x-gmsl.yaml
> - Exand bindings to describe RDACM21
> ---
> .../bindings/media/i2c/imi,rdacm2x-gmsl.yaml | 161 ++++++++++++++++++
> .../devicetree/bindings/vendor-prefixes.yaml | 2 +
> 2 files changed, 163 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml b/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
> new file mode 100644
> index 000000000000..8476e99b46b5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/imi,rdacm2x-gmsl.yaml
> @@ -0,0 +1,161 @@
> +# 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@...ndi.org>
> + - Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> + - Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> + - Niklas Söderlund <niklas.soderlund+renesas@...natech.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:
> + oneOf:
> + - items:
> + - enum:
You can drop oneOf and items.
> + - 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@...d8000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + reg = <0 0xe66d8000 0 0x40>;
> +
> + camera@31 {
> + compatible = "imi,rdacm20";
> + reg = <0x31>, <0x41>, <0x51>;
> +
> + port {
> + rdacm20_out0: endpoint {
> + remote-endpoint = <&max9286_in0>;
> + };
> + };
> + };
> + };
> +
> + - |
> + i2c@...d8000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + reg = <0 0xe66d8000 0 0x40>;
> +
> + camera@31 {
> + compatible = "imi,rdacm21";
> + reg = <0x31>, <0x41>;
> +
> + port {
> + rdacm21_out0: endpoint {
> + remote-endpoint = <&max9286_in0>;
> + };
> + };
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> index d3891386d671..dcbecdc58731 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> @@ -453,6 +453,8 @@ patternProperties:
> description: Ingenieurburo Fur Ic-Technologie (I/F/I)
> "^ilitek,.*":
> description: ILI Technology Corporation (ILITEK)
> + "^imi,.*":
> + description: Integrated Micro-Electronics Inc.
> "^img,.*":
Alphabetical order...
With those fixes,
Reviewed-by: Rob Herring <robh@...nel.org>
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