Re: [PATCH 07/14] dt-bindings: media: i2c: Add A31 MIPI CSI-2 bindings documentation

[Maxime Ripard <maxime@cerno.tech>]

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i2c? :)

On Fri, Oct 23, 2020 at 07:45:39PM +0200, Paul Kocialkowski wrote:
> This introduces YAML bindings documentation for the A31 MIPI CSI-2
> controller.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  .../media/allwinner,sun6i-a31-mipi-csi2.yaml  | 168 ++++++++++++++++++
>  1 file changed, 168 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/allwinner,sun6i-a31-mipi-csi2.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-mipi-csi2.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-mipi-csi2.yaml
> new file mode 100644
> index 000000000000..9adc0bc27033
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-mipi-csi2.yaml
> @@ -0,0 +1,168 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/allwinner,sun6i-a31-mipi-csi2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner A31 MIPI CSI-2 Device Tree Bindings
> +
> +maintainers:
> +  - Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: allwinner,sun6i-a31-mipi-csi2
> +      - items:
> +          - const: allwinner,sun8i-v3s-mipi-csi2
> +          - const: allwinner,sun6i-a31-mipi-csi2
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Bus Clock
> +      - description: Module Clock
> +
> +  clock-names:
> +    items:
> +      - const: bus
> +      - const: mod
> +
> +  phys:
> +    items:
> +      - description: MIPI D-PHY
> +
> +  phy-names:
> +    items:
> +      - const: dphy
> +
> +  resets:
> +    maxItems: 1
> +
> +  # See ./video-interfaces.txt for details
> +  ports:
> +    type: object
> +
> +    properties:
> +      port@0:
> +        type: object
> +        description: Input port, connect to a MIPI CSI-2 sensor
> +
> +        properties:
> +          reg:
> +            const: 0
> +
> +          endpoint:
> +            type: object
> +
> +            properties:
> +              remote-endpoint: true
> +
> +              bus-type:
> +                const: 4
> +
> +              clock-lanes:
> +                maxItems: 1
> +
> +              data-lanes:
> +                minItems: 1
> +                maxItems: 4
> +
> +            required:
> +              - bus-type
> +              - data-lanes
> +              - remote-endpoint
> +
> +            additionalProperties: false
> +
> +        required:
> +          - endpoint
> +
> +        additionalProperties: false
> +
> +      port@1:
> +        type: object
> +        description: Output port, connect to a CSI controller
> +
> +        properties:
> +          reg:
> +            const: 1
> +
> +          endpoint:
> +            type: object
> +
> +            properties:
> +              remote-endpoint: true
> +
> +              bus-type:
> +                const: 4

That one seems a bit weird. If the input and output ports are using the
same format, what is that "bridge" supposed to be doing?

> +            additionalProperties: false
> +
> +        required:
> +          - endpoint
> +
> +        additionalProperties: false
> +
> +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>
> +
> +    mipi_csi2: mipi-csi2@1cb1000 {

The unit name should be pretty standard, with the list here:

https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter2-devicetree-basics.rst#generic-names-recommendation

there's nothing really standing out for us in that list, but given that
there's dsi, we should stick with csi

Maxime

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