diff mbox series

[v9,1/4] dt-bindings: media: i2c: Add bindings for Maxim Integrated MAX9286

Message ID 20200512155105.1068064-2-kieran.bingham+renesas@ideasonboard.com (mailing list archive)
State Superseded
Delegated to: Kieran Bingham
Headers show
Series MAX9286 GMSL Support (+RDACM20) | expand

Commit Message

Kieran Bingham May 12, 2020, 3:51 p.m. UTC
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>
Reviewed-by: Rob Herring <robh@kernel.org>

---

v7:
 - Collect Rob's RB tag
 - Remove redundant maxItems from remote-endpoints
 - Fix SPDX licence tag

 .../bindings/media/i2c/maxim,max9286.yaml     | 287 ++++++++++++++++++
 1 file changed, 287 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml

Comments

Rob Herring May 12, 2020, 10:33 p.m. UTC | #1
On Tue, 12 May 2020 16:51:02 +0100, 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>
> Reviewed-by: Rob Herring <robh@kernel.org>
> 
> ---
> 
> v7:
>  - Collect Rob's RB tag
>  - Remove redundant maxItems from remote-endpoints
>  - Fix SPDX licence tag
> 
>  .../bindings/media/i2c/maxim,max9286.yaml     | 287 ++++++++++++++++++
>  1 file changed, 287 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> 


My bot found errors running 'make dt_binding_check' on your patch:

/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml: properties: {'enum': ['$ref', 'additionalItems', 'additionalProperties', 'allOf', 'anyOf', 'const', 'contains', 'default', 'dependencies', 'deprecated', 'description', 'else', 'enum', 'if', 'items', 'maxItems', 'maximum', 'minItems', 'minimum', 'multipleOf', 'not', 'oneOf', 'pattern', 'patternProperties', 'properties', 'propertyNames', 'required', 'then', 'unevaluatedProperties']} is not allowed for 'additionalProperties'
Documentation/devicetree/bindings/Makefile:12: recipe for target 'Documentation/devicetree/bindings/media/i2c/maxim,max9286.example.dts' failed
make[1]: *** [Documentation/devicetree/bindings/media/i2c/maxim,max9286.example.dts] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:1300: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2

See https://patchwork.ozlabs.org/patch/1288573

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.
Rob Herring May 12, 2020, 10:36 p.m. UTC | #2
On Tue, May 12, 2020 at 04:51:02PM +0100, 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>
> Reviewed-by: Rob Herring <robh@kernel.org>
> 
> ---
> 
> v7:
>  - Collect Rob's RB tag
>  - Remove redundant maxItems from remote-endpoints
>  - Fix SPDX licence tag
> 
>  .../bindings/media/i2c/maxim,max9286.yaml     | 287 ++++++++++++++++++
>  1 file changed, 287 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> 
> 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..f9d3e5712c59
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> @@ -0,0 +1,287 @@
> +# SPDX-License-Identifier: (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: |
> +  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.
> +
> +            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.
> +
> +              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

Wrong indentation. Should be 2 more or this is a DT property.

> +
> +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>;
> +                };
> +              };
> +            };
> +          };
> +        };
> +      };
> +    };
> -- 
> 2.25.1
>
Jacopo Mondi May 13, 2020, 12:28 p.m. UTC | #3
Hi Rob,

On Tue, May 12, 2020 at 05:36:10PM -0500, Rob Herring wrote:
> On Tue, May 12, 2020 at 04:51:02PM +0100, 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>
> > Reviewed-by: Rob Herring <robh@kernel.org>
> >
> > ---
> >
> > v7:
> >  - Collect Rob's RB tag
> >  - Remove redundant maxItems from remote-endpoints
> >  - Fix SPDX licence tag
> >
> >  .../bindings/media/i2c/maxim,max9286.yaml     | 287 ++++++++++++++++++
> >  1 file changed, 287 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> >
> > 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..f9d3e5712c59
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> > @@ -0,0 +1,287 @@
> > +# SPDX-License-Identifier: (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: |
> > +  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.
> > +
> > +            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.
> > +
> > +              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
>
> Wrong indentation. Should be 2 more or this is a DT property.
>

Thanks, updating the dt tools helped spotting the error locally as
well.

This fixes the error reported in the previous email, now I get a
Documentation/devicetree/bindings/media/i2c/maxim,max9286.example.dt.yaml:
gmsl-deserializer@2c: i2c-mux: 'i2c@0', 'i2c@1', 'i2c@2', 'i2c@3' do not match any of the regexes: 'pinctrl-[0-9]+'

which makes me think the i2c-mux child nodes are under-specified in
this bindings.

I have expanded them and will reply with a fixup to be applied on top
of this patch to ease review and eventually include in v10.

Thanks
  j

> > +
> > +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>;
> > +                };
> > +              };
> > +            };
> > +          };
> > +        };
> > +      };
> > +    };
> > --
> > 2.25.1
> >
diff mbox series

Patch

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..f9d3e5712c59
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
@@ -0,0 +1,287 @@ 
+# SPDX-License-Identifier: (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: |
+  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.
+
+            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.
+
+              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>;
+                };
+              };
+            };
+          };
+        };
+      };
+    };