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Subject[PATCH v4 1/4] dt-bindings: media: i2c: Add bindings for Maxim Integrated MAX9286
Date
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

The MAX9286 deserializes video data received on up to 4 Gigabit
Multimedia Serial Links (GMSL) and outputs them on a CSI-2 port using up
to 4 data lanes.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

---
v3:
- Update binding descriptions

v4:
- Define the use of a CSI2 D-PHY
- Rename pwdn-gpios to enable-gpios (with inverted polarity)
- Remove clock-lanes mapping support
- rewrap text blocks
- Fix typos
---
.../bindings/media/i2c/maxim,max9286.txt | 182 ++++++++++++++++++
1 file changed, 182 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.txt b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.txt
new file mode 100644
index 000000000000..672f6a4d417d
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.txt
@@ -0,0 +1,182 @@
+Maxim Integrated Quad GMSL Deserializer
+---------------------------------------
+
+The MAX9286 deserializer receives video data on up to 4 Gigabit Multimedia
+Serial Links (GMSL) and outputs them on a CSI-2 D-PHY port using up to 4 data
+lanes.
+
+In addition to video data, the GMSL links carry a bidirectional control channel
+that encapsulates I2C messages. The MAX9286 forwards all I2C traffic not
+addressed to itself to the other side of the links, where a GMSL serializer
+will output it on a local I2C bus. In the other direction all I2C traffic
+received over GMSL by the MAX9286 is output on the local I2C bus.
+
+Required Properties:
+
+- compatible: Shall be "maxim,max9286"
+- reg: I2C device address
+
+Optional Properties:
+
+- poc-supply: Regulator providing Power over Coax to the cameras
+- enable-gpios: GPIO connected to the #PWDN pin with inverted polarity
+
+Required endpoint nodes:
+-----------------------
+
+The connections to the MAX9286 GMSL and its endpoint nodes are modeled using
+the OF graph bindings in accordance with the video interface bindings defined
+in Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+The following table lists the port number corresponding to each device port.
+
+ Port Description
+ ----------------------------------------
+ Port 0 GMSL Input 0
+ Port 1 GMSL Input 1
+ Port 2 GMSL Input 2
+ Port 3 GMSL Input 3
+ Port 4 CSI-2 Output
+
+Optional Endpoint Properties for GMSL Input Ports (Port [0-3]):
+
+- remote-endpoint: phandle to the remote GMSL source endpoint subnode in the
+ remote node port.
+
+Required Endpoint Properties for CSI-2 Output Port (Port 4):
+
+- remote-endpoint: phandle to the remote CSI-2 sink endpoint node.
+- data-lanes: array of physical CSI-2 data lane indexes.
+
+Required i2c-mux nodes:
+----------------------
+
+Each GMSL link is modeled as a child bus of an i2c bus multiplexer/switch, in
+accordance with bindings described in
+Documentation/devicetree/bindings/i2c/i2c-mux.txt. The serializer device on the
+remote end of the GMSL link shall be modelled as a child node of the
+corresponding I2C bus.
+
+Required i2c child bus properties:
+- all properties described as required i2c child bus nodes properties in
+ Documentation/devicetree/bindings/i2c/i2c-mux.txt.
+
+Example:
+-------
+
+ gmsl-deserializer@2c {
+ compatible = "maxim,max9286";
+ reg = <0x2c>;
+ poc-supply = <&camera_poc_12v>;
+ enable-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+ max9286_in0: endpoint {
+ remote-endpoint = <&rdacm20_out0>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ max9286_in1: endpoint {
+ remote-endpoint = <&rdacm20_out1>;
+ };
+ };
+
+ port@2 {
+ reg = <2>;
+ max9286_in2: endpoint {
+ remote-endpoint = <&rdacm20_out2>;
+ };
+ };
+
+ port@3 {
+ reg = <3>;
+ max9286_in3: endpoint {
+ remote-endpoint = <&rdacm20_out3>;
+ };
+ };
+
+ port@4 {
+ reg = <4>;
+ max9286_out: endpoint {
+ data-lanes = <1 2 3 4>;
+ remote-endpoint = <&csi40_in>;
+ };
+ };
+ };
+
+ i2c@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+
+ camera@51 {
+ compatible = "imi,rdacm20";
+ reg = <0x51 0x61>;
+
+ port {
+ rdacm20_out0: endpoint {
+ remote-endpoint = <&max9286_in0>;
+ };
+ };
+
+ };
+ };
+
+ i2c@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <1>;
+
+ camera@52 {
+ compatible = "imi,rdacm20";
+ reg = <0x52 0x62>;
+ port {
+ rdacm20_out1: endpoint {
+ remote-endpoint = <&max9286_in1>;
+ };
+ };
+ };
+ };
+
+ i2c@2 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <2>;
+
+ camera@53 {
+ compatible = "imi,rdacm20";
+ reg = <0x53 0x63>;
+ port {
+ rdacm20_out2: endpoint {
+ remote-endpoint = <&max9286_in2>;
+ };
+ };
+ };
+ };
+
+ i2c@3 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <3>;
+
+ camera@54 {
+ compatible = "imi,rdacm20";
+ reg = <0x54 0x64>;
+ port {
+ rdacm20_out3: endpoint {
+ remote-endpoint = <&max9286_in3>;
+ };
+ };
+ };
+ };
+ };
--
2.17.1
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