Re: [PATCH v2 2/5] dt-bindings: media: Add bindings for ARM mali-c55

[Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>]

Hi Dan,

Thank you for the patch.

On Wed, Feb 14, 2024 at 02:19:03PM +0000, Daniel Scally wrote:
> Add the yaml binding for ARM's Mali-C55 Image Signal Processor.
> 
> Acked-by: Nayden Kanchev <nayden.kanchev@xxxxxxx>
> Signed-off-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
> ---
> Changes in v2:
> 
> 	- Added clocks information
> 	- Fixed the warnings raised by Rob
> 
>  .../bindings/media/arm,mali-c55.yaml          | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/arm,mali-c55.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/arm,mali-c55.yaml b/Documentation/devicetree/bindings/media/arm,mali-c55.yaml
> new file mode 100644
> index 000000000000..30038cfec3a4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/arm,mali-c55.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/arm,mali-c55.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ARM Mali-C55 Image Signal Processor
> +
> +maintainers:
> +  - Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
> +  - Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
> +
> +properties:
> +  compatible:
> +    const: arm,mali-c55
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: ISP video clock

I wonder if we need this clock. Granted, it's an input clock to the ISP,
but it's part of the input video bus. I don't expect anyone would ever
need to control it manually, it should be provided by the video source
automatically.

> +      - description: ISP AXI clock
> +      - description: ISP AHB-lite clock

These two other clocks look good to me.

> +
> +  clock-names:
> +    items:
> +      - const: vclk
> +      - const: aclk
> +      - const: hclk
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/properties/endpoint
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mali_c55: isp@400000 {
> +      compatible = "arm,mali-c55";
> +      reg = <0x400000 0x200000>;
> +      clocks = <&clk 0>, <&clk 1>, <&clk 2>;
> +      clock-names = "vclk", "aclk", "hclk";
> +      interrupts = <0>;
> +
> +      ports {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        port@0 {
> +          reg = <0>;
> +          isp_in: endpoint {
> +              remote-endpoint = <&mipi_out>;
> +          };
> +        };
> +      };
> +    };
> +...

-- 
Regards,

Laurent Pinchart