linux-kernel - Re: [PATCH v6 1/6] dt-bindings: media: Add Allwinner A31 ISP bindings documentation

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Date:   Sat, 27 Aug 2022 00:12:59 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v6 1/6] dt-bindings: media: Add Allwinner A31 ISP
 bindings documentation

Hi Paul,

Thank you for the patch.

On Fri, Aug 26, 2022 at 08:41:39PM +0200, Paul Kocialkowski wrote:
> This introduces YAML bindings documentation for the Allwinner A31 Image
> Signal Processor (ISP).
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../media/allwinner,sun6i-a31-isp.yaml        | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/allwinner,sun6i-a31-isp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-isp.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-isp.yaml
> new file mode 100644
> index 000000000000..2fda6e05e16c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-isp.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/allwinner,sun6i-a31-isp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner A31 Image Signal Processor Driver (ISP) Device Tree Bindings
> +
> +maintainers:
> +  - Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - allwinner,sun6i-a31-isp
> +      - allwinner,sun8i-v3s-isp
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Bus Clock
> +      - description: Module Clock
> +      - description: DRAM Clock
> +
> +  clock-names:
> +    items:
> +      - const: bus
> +      - const: mod
> +      - const: ram
> +
> +  resets:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: CSI0 input port
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: CSI1 input port
> +
> +    anyOf:
> +      - required:
> +          - port@0
> +      - required:
> +          - port@1

I'd still like to see all ports that exist in the hardware being
mandatory. I assume at least one of the A31 and V3s has two connected
ports in the SoC or you wouldn't declare them both here :-)

Apart from that, this looks good.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/sun8i-v3s-ccu.h>
> +    #include <dt-bindings/reset/sun8i-v3s-ccu.h>
> +
> +    isp: isp@...8000 {
> +        compatible = "allwinner,sun8i-v3s-isp";
> +        reg = <0x01cb8000 0x1000>;
> +        interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&ccu CLK_BUS_CSI>,
> +             <&ccu CLK_CSI1_SCLK>,
> +             <&ccu CLK_DRAM_CSI>;
> +        clock-names = "bus", "mod", "ram";
> +        resets = <&ccu RST_BUS_CSI>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +
> +                isp_in_csi0: endpoint {
> +                    remote-endpoint = <&csi0_out_isp>;
> +                };
> +            };
> +        };
> +    };
> +
> +...

-- 
Regards,

Laurent Pinchart