Re: [PATCH 2/2] media: dt-bindings: media: i2c: Add IMX300 CMOS sensor binding

[Rob Herring <robh@kernel.org>]

On Sun, Oct 18, 2020 at 02:31:06PM +0200, kholk11@gmail.com wrote:
> From: AngeloGioacchino Del Regno <kholk11@gmail.com>
> 
> Add YAML device tree binding for IMX300 CMOS image sensor, and
> the relevant MAINTAINERS entries.
> 
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
> ---
>  .../devicetree/bindings/media/i2c/imx300.yaml | 115 ++++++++++++++++++

sony,imx300.yaml

>  MAINTAINERS                                   |   8 ++
>  2 files changed, 123 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx300.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/imx300.yaml b/Documentation/devicetree/bindings/media/i2c/imx300.yaml
> new file mode 100644
> index 000000000000..82fb19c5018c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/imx300.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/imx300.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sony 1/2.3-Inch 8Mpixel Stacked CMOS Digital Image Sensor
> +
> +maintainers:
> +  - AngeloGioacchino Del Regno <kholk11@gmail.com>
> +
> +description: |-
> +  The Sony IMX300 is a 1/2.3-inch Stacked CMOS (Exmor-RS) digital image
> +  sensor with a pixel size of 1.08um and an active array size of
> +  5948H x 4140V. It is programmable through I2C interface at address 0x10.
> +  Image data is sent through MIPI CSI-2, which is configured as either 2 or
> +  4 data lanes.
> +
> +properties:
> +  compatible:
> +    const: sony,imx300
> +
> +  reg:
> +    description: I2C device address
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  VDIG-supply:
> +    description:
> +      Digital I/O voltage supply, 1.15-1.20 volts
> +
> +  VANA-supply:
> +    description:
> +      Analog voltage supply, 2.2 volts
> +
> +  VDDL-supply:
> +    description:
> +      Digital core voltage supply, 1.8 volts
> +
> +  reset-gpios:
> +    description: |-
> +      Reference to the GPIO connected to the xclr pin, if any.
> +      Must be released (set high) after all supplies are applied.
> +
> +  # See ../video-interfaces.txt for more details
> +  port:
> +    type: object
> +    properties:
> +      endpoint:
> +        type: object
> +        properties:
> +          data-lanes:
> +            description: |-
> +              The sensor supports either two-lane, or four-lane operation.
> +              If this property is omitted four-lane operation is assumed.
> +              For four-lane operation the property must be set to <0 1 2 3>.
> +            items:
> +              - const: 0
> +              - const: 1
> +              - const: 2
> +              - const: 3
> +
> +          clock-noncontinuous:
> +            type: boolean
> +            description: |-
> +              MIPI CSI-2 clock is non-continuous if this property is present,
> +              otherwise it's continuous.

No need to redefine a common property. Just 'clock-noncontinuous: true' 
to indicate using it.

> +
> +          link-frequencies:
> +            $ref: /schemas/types.yaml#/definitions/uint64-array
> +            description:
> +              Allowed data bus frequencies.

Any constraints on frequencies?

> +
> +        required:
> +          - link-frequencies
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - VANA-supply
> +  - VDIG-supply
> +  - VDDL-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        imx300: sensor@10 {
> +            compatible = "sony,imx300";
> +            reg = <0x10>;
> +            clocks = <&imx300_xclk>;
> +            VANA-supply = <&imx300_vana>;   /* 2.2v */
> +            VDIG-supply = <&imx300_vdig>;   /* 1.2v */
> +            VDDL-supply = <&imx300_vddl>;   /* 1.8v */
> +
> +            port {
> +                imx300_0: endpoint {
> +                    remote-endpoint = <&csi1_ep>;
> +                    data-lanes = <0 1 2 3>;
> +                    clock-noncontinuous;
> +                    link-frequencies = /bits/ 64 <780000000 480000000>;
> +                };
> +            };
> +        };
> +    };
> +
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c66710dd7e0a..231937d9d16a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -16279,6 +16279,14 @@ T:	git git://linuxtv.org/media_tree.git
>  F:	Documentation/devicetree/bindings/media/i2c/imx290.txt
>  F:	drivers/media/i2c/imx290.c
>  
> +SONY IMX300 SENSOR DRIVER
> +M:	AngeloGioacchino Del Regno <kholk11@gmail.com>
> +L:	linux-media@vger.kernel.org
> +S:	Maintained
> +T:	git git://linuxtv.org/media_tree.git
> +F:	Documentation/devicetree/bindings/media/i2c/imx300.yaml
> +F:	drivers/media/i2c/imx300.c
> +
>  SONY IMX319 SENSOR DRIVER
>  M:	Bingbu Cao <bingbu.cao@intel.com>
>  L:	linux-media@vger.kernel.org
> -- 
> 2.28.0
>