From: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
The IMI RDACM20 is a Gigabit Multimedia Serial Link (GMSL) camera
capable of transmitting video and I2C control messages on a coax cable
physical link for automotive applications.
Document its device tree binding interface.
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
v2:
- Provide imi vendor prefix
- Fix minor spelling
v3:
- update binding descriptions
v4:
- No change
v5:
- Specify optional third reg address for the MCU
---
.../bindings/media/i2c/imi,rdacm20.txt | 66 +++++++++++++++++++
.../devicetree/bindings/vendor-prefixes.yaml | 2 +
2 files changed, 68 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/i2c/imi,rdacm20.txt
diff --git a/Documentation/devicetree/bindings/media/i2c/imi,rdacm20.txt b/Documentation/devicetree/bindings/media/i2c/imi,rdacm20.txt
new file mode 100644
index 000000000000..4731aafed63f
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/imi,rdacm20.txt
@@ -0,0 +1,66 @@
+IMI D&D RDACM20 Automotive Camera Platform
+------------------------------------------
+
+The IMI D&D RDACM20 is a GMSL-compatible camera designed for automotive
+applications. It encloses a Maxim Integrated MAX9271 GMSL serializer, an
+Omnivision OV10635 camera sensor and an embedded MCU, and connects 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 |
+ --------------- --------------------------------
+
+The RDACM20 transmits video data generated by the embedded camera sensor on the
+GMSL serial channel to a remote GMSL de-serializer, as well as it receives and
+transmits I2C messages encapsulated in 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 embedded camera sensor and MCU. All
+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 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.
+
+Required Properties:
+
+- compatible: Shall be "imi,rdacm20".
+- reg: I2C device addresses, the first to be assigned to the serializer
+ the second to be assigned to the camera sensor. An optional third address can
+ be provided to specify the MCU address if present.
+
+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.
+
+Required endpoint properties:
+
+- remote-endpoint: phandle to the remote GMSL endpoint sub-node in the remote
+ node port.
+
+Example:
+-------
+
+ i2c@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+
+ camera@51 {
+ compatible = "imi,rdacm20";
+ reg = <0x31 0x41 0x51>;
+
+ port {
+ rdacm20_out0: endpoint {
+ remote-endpoint = <&max9286_in0>;
+ };
+ };
+
+ };
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 6046f4555852..80042764d2c6 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -429,6 +429,8 @@ patternProperties:
description: Ingenieurburo Fur Ic-Technologie (I/F/I)
"^ilitek,.*":
description: ILI Technology Corporation (ILITEK)
+ "^imi,.*":
+ description: Integrated Micro-Electronics Inc.
"^img,.*":
description: Imagination Technologies Ltd.
"^incircuit,.*":
--
2.20.1
