Re: [PATCH 11/14] dt-bindings: media: i2c: Add A83T MIPI CSI-2 bindings documentation

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Hi Paul,

On Fri, Oct 23, 2020 at 07:45:43PM +0200, Paul Kocialkowski wrote:
> This introduces YAML bindings documentation for the A83T MIPI CSI-2
> controller.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  .../media/allwinner,sun8i-a83t-mipi-csi2.yaml | 158 ++++++++++++++++++
>  1 file changed, 158 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/allwinner,sun8i-a83t-mipi-csi2.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun8i-a83t-mipi-csi2.yaml b/Documentation/devicetree/bindings/media/allwinner,sun8i-a83t-mipi-csi2.yaml
> new file mode 100644
> index 000000000000..2384ae4e7be0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun8i-a83t-mipi-csi2.yaml
> @@ -0,0 +1,158 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/allwinner,sun8i-a83t-mipi-csi2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner A83T MIPI CSI-2 Device Tree Bindings
> +
> +maintainers:
> +  - Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> +
> +properties:
> +  compatible:
> +    const: allwinner,sun8i-a83t-mipi-csi2
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Bus Clock
> +      - description: Module Clock
> +      - description: MIPI-specific Clock
> +      - description: Misc CSI Clock
> +
> +  clock-names:
> +    items:
> +      - const: bus
> +      - const: mod
> +      - const: mipi
> +      - const: misc
> +
> +  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

Again, if this is D-PHY only, you can remove this.

> +
> +              clock-lanes:
> +                maxItems: 1
> +
> +              data-lanes:
> +                minItems: 1
> +                maxItems: 4

Does the device support lane reordering? If not, you can remove
clock-lanes.

> +
> +            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

Is it a MIPI CSI-2 D-PHY -> MIPI CSI-2 D-PHY device? I call that "cable".
:-)

> +
> +            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-a83t-ccu.h>
> +    #include <dt-bindings/reset/sun8i-a83t-ccu.h>
> +
> +    mipi_csi2: mipi-csi2@1cb1000 {
> +        compatible = "allwinner,sun8i-a83t-mipi-csi2";
> +        reg = <0x01cb1000 0x1000>;
> +        interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&ccu CLK_BUS_CSI>,
> +                 <&ccu CLK_CSI_SCLK>,
> +                 <&ccu CLK_MIPI_CSI>,
> +                 <&ccu CLK_CSI_MISC>;
> +        clock-names = "bus", "mod", "mipi", "misc";
> +        resets = <&ccu RST_BUS_CSI>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            mipi_csi2_in: port@0 {
> +                reg = <0>;
> +
> +                mipi_csi2_in_ov8865: endpoint {
> +                    bus-type = <4>; /* MIPI CSI-2 D-PHY */
> +                    clock-lanes = <0>;
> +                    data-lanes = <1 2 3 4>;
> +
> +                    remote-endpoint = <&ov8865_out_mipi_csi2>;
> +                };
> +            };
> +
> +            mipi_csi2_out: port@1 {
> +                reg = <1>;
> +
> +                mipi_csi2_out_csi: endpoint {
> +                    bus-type = <4>; /* MIPI CSI-2 D-PHY */
> +                    remote-endpoint = <&csi_in_mipi_csi2>;
> +                };
> +            };
> +        };
> +    };
> +
> +...

-- 
Regards,

Sakari Ailus