linux-kernel - Re: [PATCH v3 1/4] dt-bindings: media: platform: visconti: Add Toshiba Visconti Video Input Interface bindings

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Message-ID: <20220810153802.GA585-robh@kernel.org>
Date:   Wed, 10 Aug 2022 09:38:02 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/4] dt-bindings: media: platform: visconti: Add
 Toshiba Visconti Video Input Interface bindings

On Wed, Aug 10, 2022 at 10:28:19PM +0900, Yuji Ishikawa wrote:
> Adds the Device Tree binding documentation that allows to describe
> the Video Input Interface found in Toshiba Visconti SoCs.
> 
> Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> Reviewed-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> ---
> Chengelog v2:
> - no change
> 
> Changelog v3:
> - no change
> ---
>  .../bindings/media/toshiba,visconti-viif.yaml | 103 ++++++++++++++++++
>  1 file changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/toshiba,visconti-viif.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/toshiba,visconti-viif.yaml b/Documentation/devicetree/bindings/media/toshiba,visconti-viif.yaml
> new file mode 100644
> index 000000000..848ea5019
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/toshiba,visconti-viif.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/toshiba,visconti-viif.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Toshiba Visconti5 SoC Video Input Interface Device Tree Bindings
> +
> +maintainers:
> +  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> +
> +description: |

Don't need '|' if no formatting.

> +  Toshiba Visconti5 SoC Video Input Interface (VIIF) receives MIPI CSI2 video stream,
> +  processes the stream with embedded image signal processor (L1ISP, L2ISP), then stores pictures to main memory.

Wrap lines at 80 char.

> +
> +properties:
> +  compatible:
> +    const: toshiba,visconti-viif
> +
> +  reg:
> +    items:
> +      - description: registers for capture control
> +      - description: registers for CSI2 receiver control
> +
> +  interrupts:
> +    items:
> +      - description: Sync Interrupt
> +      - description: Status (Error) Interrupt
> +      - description: CSI2 Receiver Interrupt
> +      - description: L1ISP Interrupt
> +
> +  index:
> +    enum: [0, 1]

No, we don't do indices in DT. Why do you need this?

> +
> +  port:
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    unevaluatedProperties: false
> +    description: Input port node, single endpoint describing the CSI-2 transmitter.
> +
> +    properties:
> +      endpoint:
> +        $ref: video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          data-lanes:
> +            description: VIIF supports 2 or 4 data lines
> +            items:
> +              minItems: 1
> +              maxItems: 4
> +              items:
> +                - const: 1
> +                - const: 2
> +                - const: 3
> +                - const: 4

blank line

> +          clock-lanes:
> +            description: VIIF supports 1 clock line
> +            const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - port
> +
> +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>;
> +
> +        viif0: viif@...00000 {

Drop unused labels.

> +            compatible = "toshiba,visconti-viif";
> +            reg = <0 0x1c000000 0 0x6000>,
> +                  <0 0x1c008000 0 0x400>;
> +            interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
> +            index = <0>;
> +            status = "disabled";

Why is your example disabled? Don't put 'status' in examples.

> +
> +            port {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                csi_in0: endpoint {
> +                    remote-endpoint = <&imx219_out0>;
> +                    bus-type = <4>;
> +                    data-lanes = <1 2>;
> +                    clock-lanes = <0>;
> +                    clock-noncontinuous;
> +                    link-frequencies = /bits/ 64 <456000000>;
> +                };
> +            };
> +        };
> +    };
> +
> -- 
> 2.17.1
> 
> 
>