Re: [PATCH v6 1/2] dt-bindings: media: i2c: Add bindings for Maxim Integrated MAX9286

[Rob Herring <robh@kernel.org>]

On Wed, Dec 11, 2019 at 12:44:58PM +0000, Kieran Bingham wrote:
> 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>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
>  .../bindings/media/i2c/maxim,max9286.yaml     | 289 ++++++++++++++++++
>  1 file changed, 289 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml

A couple of nits, with those fixed:

Reviewed-by: Rob Herring <robh@kernel.org>

> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> new file mode 100644
> index 000000000000..d37ea2c432f6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> @@ -0,0 +1,289 @@
> +# SPDX-License-Identifier: GPL-2.0-only

Dual license new bindings please:

(GPL-2.0-only OR BSD-2-Clause)

> +# Copyright (C) 2019 Renesas Electronics Corp.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/maxim,max9286.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim Integrated Quad GMSL Deserializer
> +
> +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: -|

I usually see '|-', but I guess that works.

> +  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.
> +
> +properties:
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  compatible:
> +    const: maxim,max9286
> +
> +  reg:
> +    description: I2C device address
> +    maxItems: 1
> +
> +  poc-supply:
> +    description: Regulator providing Power over Coax to the cameras
> +    maxItems: 1
> +
> +  enable-gpios:
> +    description: GPIO connected to the \#PWDN pin with inverted polarity
> +    maxItems: 1
> +
> +  ports:
> +    type: object
> +    description: -|
> +      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
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +      port@[0-3]:
> +        type: object
> +        properties:
> +          reg:
> +            enum: [ 0, 1, 2, 3 ]
> +
> +          endpoint:
> +            type: object
> +
> +            properties:
> +              remote-endpoint:
> +                description: -|
> +                 phandle to the remote GMSL source endpoint subnode in the
> +                 remote node port.
> +                maxItems: 1

This is not an array. You can just drop and assume it has a type defined 
elsewhere.

> +
> +            required:
> +              - remote-endpoint
> +
> +        required:
> +          - reg
> +          - endpoint
> +
> +        additionalProperties: false
> +
> +      port@4:
> +        type: object
> +        properties:
> +          reg:
> +            const: 4
> +
> +          endpoint:
> +            type: object
> +
> +            properties:
> +              remote-endpoint:
> +                description: phandle to the remote CSI-2 sink endpoint.
> +                maxItems: 1

And here.

> +
> +              data-lanes:
> +                description: array of physical CSI-2 data lane indexes.
> +
> +            required:
> +              - remote-endpoint
> +              - data-lanes
> +
> +        required:
> +          - reg
> +          - endpoint
> +
> +        additionalProperties: false
> +
> +    required:
> +      - port@4
> +
> +  i2c-mux:
> +    type: object
> +    description: -|
> +      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.
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +  additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +  - i2c-mux
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c@e66d8000 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      reg = <0 0xe66d8000 0 0x40>;
> +
> +      gmsl-deserializer@2c {
> +        compatible = "maxim,max9286";
> +        reg = <0x2c>;
> +        poc-supply = <&camera_poc_12v>;
> +        enable-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
> +
> +        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-mux {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          i2c@0 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            reg = <0>;
> +
> +            camera@51 {
> +              reg = <0x51>;
> +
> +              port {
> +                rdacm20_out0: endpoint {
> +                  remote-endpoint = <&max9286_in0>;
> +                };
> +              };
> +
> +            };
> +          };
> +
> +          i2c@1 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <1>;
> +
> +            camera@52 {
> +              reg = <0x52>;
> +
> +              port {
> +                rdacm20_out1: endpoint {
> +                  remote-endpoint = <&max9286_in1>;
> +                };
> +              };
> +            };
> +          };
> +
> +          i2c@2 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <2>;
> +
> +            camera@53 {
> +              reg = <0x53>;
> +
> +              port {
> +                rdacm20_out2: endpoint {
> +                  remote-endpoint = <&max9286_in2>;
> +                };
> +              };
> +            };
> +          };
> +
> +          i2c@3 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <3>;
> +
> +            camera@54 {
> +              reg = <0x54>;
> +
> +              port {
> +                rdacm20_out3: endpoint {
> +                  remote-endpoint = <&max9286_in3>;
> +                };
> +              };
> +            };
> +          };
> +        };
> +      };
> +    };
> -- 
> 2.20.1
>