linux-kernel - Re: [PATCH v12 1/8] dt-bindings: media: platform: visconti: Add Toshiba Visconti MIPI CSI-2 Receiver

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Message-ID: <20250102092925.GC554@pendragon.ideasonboard.com>
Date: Thu, 2 Jan 2025 11:29:25 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v12 1/8] dt-bindings: media: platform: visconti: Add
 Toshiba Visconti MIPI CSI-2 Receiver

Hello Ishikawa-san,

Thank you for the patch.

On Mon, Nov 25, 2024 at 06:21:39PM +0900, Yuji Ishikawa wrote:
> Adds the Device Tree binding documentation that allows to describe
> the MIPI CSI-2 Receiver found in Toshiba Visconti SoCs.
> 
> Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> Reviewed-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> ---
> 
> Changelog v12:
> - Newly add bindings for CSI2RX driver 
> 
>  .../media/toshiba,visconti5-csi2rx.yaml       | 104 ++++++++++++++++++
>  1 file changed, 104 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yaml b/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yaml
> new file mode 100644
> index 000000000000..5488072bc82a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/toshiba,visconti5-csi2rx.yaml
> @@ -0,0 +1,104 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/toshiba,visconti5-csi2rx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Toshiba Visconti5 SoC MIPI CSI-2 receiver
> +
> +maintainers:
> +  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> +
> +description: |-

As Krzysztof mentioned, '|-' isn't needed. See
https://yaml-multiline.info/ for more information. The literal block
style indicator ('|') is only needed when line breaks need to be
preserved, e.g. when the description contains ASCII art.

> +  Toshiba Visconti5 SoC MIPI CSI-2 receiver device receives MIPI CSI-2 video
> +  stream. Use with VIIF device. T.B.D

T.B.D ?

> +
> +properties:
> +  compatible:
> +    const: toshiba,visconti5-csi2rx
> +
> +  reg:
> +    items:
> +      - description: Registers for CSI2 receiver control
> +
> +  interrupts:
> +    items:
> +      - description: CSI2 Receiver Interrupt
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description:
> +          Input port node, single endpoint describing the CSI-2 transmitter.
> +
> +        properties:
> +          endpoint:
> +            $ref: video-interfaces.yaml#

Please use a full path for the ref:

            $ref: /schemas/media/video-interfaces.yaml#

> +            unevaluatedProperties: false
> +
> +            properties:
> +              data-lanes:
> +                description: CSI2 receiver supports 1, 2, 3 or 4 data lanes

You can drop the description. The video-interfaces.yaml schema has a
more complete description, and the fact that the receiver supports
between 1 and 4 lanes is conveyed by minItems and items below.

> +                minItems: 1
> +                items:
> +                  - const: 1
> +                  - const: 2
> +                  - const: 3
> +                  - const: 4
> +            required:
> +              - data-lanes
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Output port node, single endpoint describing the Visconti VIIF.
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        csi2rx@...08000 {

Node names should describe the function of the node, not the precise
model of the device. "csi2" would be a more appropriate name.

> +            compatible = "toshiba,visconti5-csi2rx";
> +            reg = <0 0x1c008000 0 0x400>;
> +            interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {
> +                    reg = <0>;
> +                    csi2rx_in0: endpoint {
> +                        data-lanes = <1 2>;
> +                        remote-endpoint = <&imx219_out0>;
> +                    };
> +                };
> +                port@1 {
> +                    reg = <1>;
> +                    csi2rx_out0: endpoint {
> +                        remote-endpoint = <&csi_in0>;
> +                    };
> +                };
> +            };
> +        };
> +    };

-- 
Regards,

Laurent Pinchart