linux-kernel - Re: [PATCH v2 1/3] dt-bindings: media: imx258: Add bindings for IMX258 sensor

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Message-ID: <20200914201310.GA154873@bogus>
Date:   Mon, 14 Sep 2020 14:13:10 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: media: imx258: Add bindings for
 IMX258 sensor

On Wed, Sep 02, 2020 at 09:18:08AM +0200, Krzysztof Kozlowski wrote:
> Add bindings for the IMX258 camera sensor.  The bindings, just like the
> driver, are quite limited, e.g. do not support regulator supplies.

Bindings should be complete, not what a driver happens to currently 
support.

> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> 
> ---
> 
> Changes since v1:
> 1. None
> ---
>  .../devicetree/bindings/media/i2c/imx258.yaml      | 92 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 93 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx258.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/imx258.yaml b/Documentation/devicetree/bindings/media/i2c/imx258.yaml
> new file mode 100644
> index 000000000000..ef789ad31143
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/imx258.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/imx258.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sony IMX258 13 Mpixel CMOS Digital Image Sensor
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzk@...nel.org>
> +
> +description: |-
> +  IMX258 is a diagonal 5.867mm (Type 1/3.06) 13 Mega-pixel CMOS active pixel
> +  type stacked image sensor with a square pixel array of size 4208 x 3120. It
> +  is programmable through I2C interface.  Image data is sent through MIPI
> +  CSI-2.
> +
> +properties:
> +  compatible:
> +    const: sony,imx258
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-frequency:
> +    description: Frequency of input clock if clock is not provided
> +    deprecated: true

Why are we adding something deprecated on a new binding?

> +    const: 19200000
> +
> +  reg:
> +    maxItems: 1
> +
> +  # See ../video-interfaces.txt for more details
> +  port:
> +    type: object
> +    properties:
> +      endpoint:
> +        type: object
> +        properties:
> +          data-lanes:
> +            items:
> +              - const: 1
> +              - const: 2
> +              - const: 3
> +              - const: 4

If this is the only config, why does it need to be in DT?

> +
> +          link-frequencies:
> +            allOf:
> +              - $ref: /schemas/types.yaml#/definitions/uint64-array
> +            description:
> +              Allowed data bus frequencies.
> +
> +        required:
> +          - data-lanes
> +          - link-frequencies
> +
> +required:
> +  - compatible
> +  - reg
> +  - port
> +
> +
> +if:
> +  not:
> +    required:
> +      - clocks
> +then:
> +  required:
> +    - clock-frequency
> +
> +unevaluatedProperties: false

additionalProperties

> +
> +examples:
> +  - |
> +    i2c0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        sensor@6c {
> +            compatible = "sony,imx258";
> +            reg = <0x6c>;
> +            clocks = <&imx258_clk>;
> +
> +            port {
> +                imx258_ep: endpoint {
> +                    remote-endpoint = <&csi1_ep>;
> +                    data-lanes = <1 2 3 4>;
> +                    link-frequencies = /bits/ 64 <320000000>;
> +                };
> +            };
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dc2aa691b75a..cca13d483d22 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -16130,6 +16130,7 @@ M:	Sakari Ailus <sakari.ailus@...ux.intel.com>
>  L:	linux-media@...r.kernel.org
>  S:	Maintained
>  T:	git git://linuxtv.org/media_tree.git
> +F:	Documentation/devicetree/bindings/media/i2c/imx258.yaml
>  F:	drivers/media/i2c/imx258.c
>  
>  SONY IMX274 SENSOR DRIVER
> -- 
> 2.7.4
>