linux-kernel - Re: [PATCH 8/9] media: dt-bindings: Add Intel Displayport RX IP

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Date: Thu, 15 Feb 2024 17:26:23 +0000
From: Conor Dooley <conor@...nel.org>
To: Paweł Anikiel <panikiel@...gle.com>
Cc: airlied@...il.com, akpm@...ux-foundation.org, conor+dt@...nel.org,
	daniel@...ll.ch, dinguyen@...nel.org, hverkuil-cisco@...all.nl,
	krzysztof.kozlowski+dt@...aro.org,
	maarten.lankhorst@...ux.intel.com, mchehab@...nel.org,
	mripard@...nel.org, robh+dt@...nel.org, tzimmermann@...e.de,
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	chromeos-krk-upstreaming@...gle.com, ribalda@...omium.org
Subject: Re: [PATCH 8/9] media: dt-bindings: Add Intel Displayport RX IP

Yo,

On Mon, Feb 12, 2024 at 01:13:22PM +0000, Paweł Anikiel wrote:
> The Intel Displayport RX IP is a part of the DisplayPort Intel FPGA IP
> Core. It implements a DisplayPort 1.4 receiver capable of HBR3 video
> capture and Multi-Stream Transport. The user guide can be found here:
> 
> https://www.intel.com/programmable/technical-pdfs/683273.pdf
> 
> Signed-off-by: Paweł Anikiel <panikiel@...gle.com>
> ---
>  .../devicetree/bindings/media/intel,dprx.yaml | 125 ++++++++++++++++++
>  1 file changed, 125 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/intel,dprx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/intel,dprx.yaml b/Documentation/devicetree/bindings/media/intel,dprx.yaml
> new file mode 100644
> index 000000000000..3ed37e0a4a94
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/intel,dprx.yaml
> @@ -0,0 +1,125 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/intel,dprx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Intel DisplayPort RX IP
> +
> +maintainers:
> +  - Paweł Anikiel <panikiel@...gle.com>
> +
> +properties:
> +  compatible:
> +    const: intel,dprx

Please version this compatible, given that is it for an FPGA IP.
I could not find an example of another intel IP that had versioning, but
there's plenty of xilinx stuff you can get inspiration from.

> +  reg:
> +    items:
> +      - description: core registers
> +      - description: irq registers
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  intel,has-mst:

Mostly this looks fine, but this property drew my eye.
Firstly, I'd probably call this "intel,multi-stream-support" rather than
"intel,has-mst".

> +    type: boolean
> +    description: The device supports Multi-Stream Transport

Secondly, there are many many configuration parameters for this IP,
but you have chosen to document just one.
Are all other configuration parameters currently in their default
states or ignored by the driver? If not, please at least document all
configuration settings that you rely on - for example the max stream
count or audio packet encoding.

> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +    description: SST main link
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: MST virtual channel 0 or SST main link
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: MST virtual channel 1
> +
> +      port@2:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: MST virtual channel 2
> +
> +      port@3:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: MST virtual channel 3
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +allOf:
> +  - if:
> +      required:
> +        - intel,has-mst
> +    then:
> +      required:
> +        - ports
> +    else:
> +      required:
> +        - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dprx@...62000 {

"dprx" isn't a class of device, please try to use a generic node name
here.

Thanks,
Conor.

> +        compatible = "intel,dprx";
> +        reg = <0xc0062000 0x800>,
> +              <0xc0060f80 0x10>;
> +        interrupts = <GIC_SPI 27 IRQ_TYPE_LEVEL_HIGH>;
> +        intel,has-mst;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                dprx_mst_0: endpoint {
> +                    remote-endpoint = <&fb_mst0_0>;
> +                };
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +                dprx_mst_1: endpoint {
> +                    remote-endpoint = <&fb_mst1_0>;
> +                };
> +            };
> +
> +            port@2 {
> +                reg = <2>;
> +                dprx_mst_2: endpoint {
> +                    remote-endpoint = <&fb_mst2_0>;
> +                };
> +            };
> +
> +            port@3 {
> +                reg = <3>;
> +                dprx_mst_3: endpoint {
> +                    remote-endpoint = <&fb_mst3_0>;
> +                };
> +            };
> +        };
> +    };
> +
> +  - |
> +    dprx@...64000 {
> +        compatible = "intel,dprx";
> +        reg = <0xc0064000 0x800>,
> +              <0xc0060fe0 0x10>;
> +        interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
> +
> +        port {
> +            dprx_sst_0: endpoint {
> +                remote-endpoint = <&fb_sst_0>;
> +            };
> +        };
> +    };
> -- 
> 2.43.0.687.g38aa6559b0-goog
> 

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