linux-kernel - Re: [PATCH v5 1/4] dt-bindings: media: Document bindings for DW MIPI CSI-2 Host

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Message-ID: <3a0980ef-7128-1153-7016-6bb44760bf3b@kernel.org>
Date:   Tue, 20 Dec 2022 15:16:37 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>,
        linux-media@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, luis.oliveira@...opsys.com,
        Luis Oliveira <lolivei@...opsys.com>
Subject: Re: [PATCH v5 1/4] dt-bindings: media: Document bindings for DW MIPI
 CSI-2 Host

On 16/12/2022 15:37, Eugen Hristev wrote:
> Add bindings for Synopsys DesignWare MIPI CSI-2 host.
> 
> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
> [eugen.hristev@...rochip.com: reworked binding, converted to yaml]
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> ---

1. Please use scripts/get_maintainers.pl to get a list of necessary
people and lists to CC.  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older kernel, gives you outdated entries.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.

You did not CC anyone, so who is supposed to take this patch?

2. Subject: drop second, redundant "bindings for".

>  .../bindings/media/snps,dw-csi.yaml           | 149 ++++++++++++++++++
>  1 file changed, 149 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/snps,dw-csi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-csi.yaml b/Documentation/devicetree/bindings/media/snps,dw-csi.yaml
> new file mode 100644
> index 000000000000..439eadc8e517
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,dw-csi.yaml
> @@ -0,0 +1,149 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/snps,dw-csi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Synopsys DesignWare CSI-2 Host controller (csi2host)
> +
> +maintainers:
> +  - Eugen Hristev <eugen.hristev@...rochip.com>
> +
> +description:
> +  CSI2HOST is used to receive image coming from an MIPI CSI-2 compatible
> +  camera. It will convert the incoming CSI-2 stream into a dedicated
> +  interface called the Synopsys IDI (Image Data Interface).
> +  This interface is a 32-bit SoC internal only, and can be assimilated
> +  with a CSI-2 interface.
> +
> +properties:
> +  compatible:
> +    const: snps,dw-csi
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    description:
> +      CSI2HOST can have two clocks connected. One clock is the
> +      peripheral clock for the inside functionality of the hardware block.
> +      This is named 'perclk'. The second clock can be the phy clock,
> +      which is used to clock the phy via an internal link.
> +      This clock is named 'phyclk', phy clock.
> +    items:
> +      - const: perclk
> +      - const: phyclk

Drop "clk" from both


> +
> +  phys:
> +    maxItems: 1
> +    description: MIPI D-PHY
> +
> +  phy-names:
> +    items:
> +      - const: dphy
> +
> +  resets:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  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 input port.
> +
> +        properties:
> +          endpoint:
> +            $ref: video-interfaces.yaml#
> +            unevaluatedProperties: false
> +            description: Endpoint connected to input device
> +
> +            properties:
> +              bus-type:
> +                const: 4
> +
> +              data-lanes:
> +                minItems: 1
> +                maxItems: 4
> +                items:
> +                  maximum: 4
> +
> +              clock-lanes:
> +                maxItems: 1
> +
> +              remote-endpoint: true
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description:
> +          Output port node, single endpoint describing the output port.
> +
> +        properties:
> +          endpoint:
> +            unevaluatedProperties: false
> +            $ref: video-interfaces.yaml#
> +            description: Endpoint connected to output device
> +
> +            properties:
> +              bus-type:
> +                const: 4
> +
> +              remote-endpoint: true
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - ports

reg? phys? interrupts? All others?

> +
> +examples:
> +  - |
> +    csi2: csi2@...0 {

Generic node names, so "csi"

> +        compatible = "snps,dw-csi";
> +        reg = <0x03000 0x7FF>;

lowercase hex

> +        phys = <&mipi_dphy_rx>;
> +        phy-names = "dphy";
> +        resets = <&dw_rst 1>;
> +        interrupts = <2>;
> +

Best regards,
Krzysztof