Re: [PATCH 1/2] dt-bindings: media: i2c: Add bindings for Maxim Integrated MAX9286

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CC devicetree

cover letter at
https://lore.kernel.org/linux-renesas-soc/20190809040558.10698-1-niklas.soderlund+renesas@xxxxxxxxxxxx/

On Fri, Aug 9, 2019 at 6:07 AM Niklas Söderlund
<niklas.soderlund+renesas@xxxxxxxxxxxx> wrote:
> From: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxxx>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> ---
>  .../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 0000000000000000..afff77a55bb70744
> --- /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 modelled 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 modelled 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_HIGH>;
> +
> +               #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>;
> +                                       };
> +                               };
> +                       };
> +               };
> +       };
> --
> 2.22.0
>



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