linux-kernel - Re: [PATCH 1/2] media: dt-bindings: imx519: Add IMX519 DT bindings

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Message-ID: <7dea9abf-4ab4-55ec-5a00-829840b221c2@kernel.org>
Date:   Fri, 28 Jul 2023 10:18:53 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Umang Jain <umang.jain@...asonboard.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Lee Jackson <lee.jackson@...ucam.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Shawn Tu <shawnx.tu@...el.com>,
        Nicholas Roth <nicholas@...hemail.net>,
        Mikhail Rudenko <mike.rudenko@...il.com>,
        kieran.bingham@...asonboard.com,
        Marco Felsch <m.felsch@...gutronix.de>,
        jacopo.mondi@...asonboard.com
Subject: Re: [PATCH 1/2] media: dt-bindings: imx519: Add IMX519 DT bindings

On 27/07/2023 17:41, Umang Jain wrote:
> From: Lee Jackson <lee.jackson@...ucam.com>
> 
> Add YAML device tree binding documentation for IMX519 CMOS
> image sensor.

Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC (and consider --no-git-fallback argument). It might
happen, that command when run on an older kernel, gives you outdated
entries. Therefore please be sure you base your patches on recent Linux
kernel.

> 
> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> ---
>  .../bindings/media/i2c/sony,imx519.yaml       | 113 ++++++++++++++++++

A nit, subject: drop second/last, redundant "DT bindings". The
"dt-bindings" prefix is already stating that these are bindings.

>  1 file changed, 113 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/sony,imx519.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/sony,imx519.yaml b/Documentation/devicetree/bindings/media/i2c/sony,imx519.yaml
> new file mode 100644
> index 000000000000..6f38b09890d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/sony,imx519.yaml
> @@ -0,0 +1,113 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/imx519.yaml#

Please test.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sony 1/2.5-Inch 16Mpixel CMOS Digital Image Sensor
> +
> +maintainers:
> +  - Lee Jackson <lee.jackson@...ucam.com>
> +
> +description: |-
> +  The Sony IMX519 is a 1/2.5-inch CMOS active pixel digital image sensor
> +  with an active array size of 4656H x 3496V. It is programmable through
> +  I2C interface. The I2C address is fixed to 0x1A as per sensor data sheet.
> +  Image data is sent through MIPI CSI-2, which is configured as either 2 or
> +  4 data lanes.
> +
> +properties:
> +  compatible:
> +    const: sony,imx519
> +
> +  reg:
> +    description: I2C device address

Drop description, it's obvious.

> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  VDIG-supply:

lowercase

> +    description:
> +      Digital I/O voltage supply, 1.05 volts
> +
> +  VANA-supply:

lowercase

> +    description:
> +      Analog voltage supply, 2.8 volts
> +
> +  VDDL-supply:

lowercase

> +    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 and INCK are applied.
> +
> +  # See ../video-interfaces.txt for more details
> +  port:

That's not how this is done. Open existing bindings, e.g. imx219, 258 or
any other and look. Please, do not write patches entirely different than
all other drivers/bindings. There is a reason why some things work but
other don't

> +    type: object
> +    properties:
> +      endpoint:
> +        type: object
> +        properties:
> +          data-lanes:
> +            description: |-
> +              The sensor supports either two-lane, or four-lane operation.
> +              For two-lane operation the property must be set to <1 2>.
> +            items:
> +              - const: 1
> +              - const: 2
> +
> +          clock-noncontinuous:
> +            type: boolean
> +            description: |-
> +              MIPI CSI-2 clock is non-continuous if this property is present,
> +              otherwise it's continuous.
> +
> +          link-frequencies:
> +            allOf:
> +              - $ref: /schemas/types.yaml#/definitions/uint64-array
> +            description:
> +              Allowed data bus frequencies.
> +
> +        required:
> +          - link-frequencies
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - VANA-supply
> +  - VDIG-supply
> +  - VDDL-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c0 {

i2c

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        imx519: sensor@1a {

drop the label imx519.

Best regards,
Krzysztof