linux-kernel - Re: [PATCH v2 1/2] media: dt-bindings: Add ST VD56G3 camera sensor binding

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Date: Tue, 21 May 2024 19:37:47 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sylvain Petinot <sylvain.petinot@...s.st.com>,
 benjamin.mugnier@...s.st.com, mchehab@...nel.org, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] media: dt-bindings: Add ST VD56G3 camera sensor
 binding

On 21/05/2024 18:29, Sylvain Petinot wrote:
> Add devicetree bindings Documentation for ST VD56G3 & ST VD66GY camera
> sensors. Update MAINTAINERS file.
> 

A nit, subject: drop second/last, redundant "binding". The "dt-bindings"
prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18


> Signed-off-by: Sylvain Petinot <sylvain.petinot@...s.st.com>
> ---
>  .../bindings/media/i2c/st,st-vd56g3.yaml      | 132 ++++++++++++++++++
>  MAINTAINERS                                   |   9 ++
>  2 files changed, 141 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/st,st-vd56g3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/st,st-vd56g3.yaml b/Documentation/devicetree/bindings/media/i2c/st,st-vd56g3.yaml
> new file mode 100644
> index 000000000000..22cb2557e311
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/st,st-vd56g3.yaml

Why duplicated 'st'?

> @@ -0,0 +1,132 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (c) 2024 STMicroelectronics SA.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/st,st-vd56g3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STMicroelectronics VD56G3 Global Shutter Image Sensor
> +
> +maintainers:
> +  - Benjamin Mugnier <benjamin.mugnier@...s.st.com>
> +  - Sylvain Petinot <sylvain.petinot@...s.st.com>
> +
> +description: |-
> +  The STMicroelectronics VD56G3 is a 1.5 M pixel global shutter image sensor

This claims device is VD56G3, not ST-VD56G3.

> +  with an active array size of 1124 x 1364 (portrait orientation). It is
> +  programmable through I2C, the address is fixed to 0x10. The sensor output is
> +  available via CSI-2, which is configured as either 1 or 2 data lanes. The
> +  sensor provides 8 GPIOS that can be used for external LED signal
> +  (synchronized with sensor integration periods)
> +
> +properties:
> +  compatible:
> +    enum:
> +      - st,st-vd56g3
> +      - st,st-vd66gy
> +    description:
> +      Two variants are availables; VD56G3 is a monochrome sensor while VD66GY
> +      is a colour variant.
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  vcore-supply:
> +    description: Digital core power supply (1.15V)
> +
> +  vddio-supply:
> +    description: Digital IO power supply (1.8V)
> +
> +  vana-supply:
> +    description: Analog power supply (2.8V)
> +
> +  reset-gpios:
> +    description: Sensor reset active low GPIO (XSHUTDOWN)
> +    maxItems: 1
> +
> +  st,leds:
> +    description:
> +      Sensor's GPIOs used for external LED control. Signal being the enveloppe
> +      of the integration time.

More information is needed. GPIOs coming from LED or SoC? What's the
meaning of values?

> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 8
> +    items:
> +      minimum: 0
> +      maximum: 7
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/$defs/port-base

missing additionalProperties: false

> +
> +    properties:
> +      endpoint:
> +        $ref: /schemas/media/video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          data-lanes:
> +            minItems: 1
> +            maxItems: 2
> +            items:
> +              enum: [1, 2]


> +
> +          link-frequencies:
> +            minItems: 1

maxItems is enough

> +            maxItems: 1
> +            items:
> +              enum: [402000000, 750000000]
> +
> +          lane-polarities:
> +            minItems: 1
> +            maxItems: 3
> +            description: Any lane can be inverted or not.
> +
> +        required:
> +          - data-lanes
> +          - link-frequencies
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - vcore-supply
> +  - vddio-supply
> +  - vana-supply
> +  - reset-gpios
> +  - port
> +


Not a video-interface-device.yaml type of device?

Best regards,
Krzysztof