linux-kernel - Re: [PATCH v2 3/7] dt-bindings: usb: Add Type-C switch binding

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Message-ID: <20220613203804.3d23gxidkw657ggq@notapiano>
Date:   Mon, 13 Jun 2022 16:38:04 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        bleung@...omium.org, swboyd@...omium.org,
        heikki.krogerus@...ux.intel.com,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Pin-Yen Lin <treapking@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Xin Ji <xji@...logixsemi.com>
Subject: Re: [PATCH v2 3/7] dt-bindings: usb: Add Type-C switch binding

Hi Prashant,

thanks for the patch. Please see sugestions below.

On Thu, Jun 09, 2022 at 06:09:42PM +0000, Prashant Malani wrote:
> Introduce a binding which represents a component that can control the
> routing of USB Type-C data lines as well as address data line
> orientation (based on CC lines' orientation).
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> ---
> 
> Changes since v1:
> - Removed "items" from compatible.
> - Fixed indentation in example.
> 
>  .../devicetree/bindings/usb/typec-switch.yaml | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/typec-switch.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/typec-switch.yaml b/Documentation/devicetree/bindings/usb/typec-switch.yaml
> new file mode 100644
> index 000000000000..78b0190c8543
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/typec-switch.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/typec-switch.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: USB Type-C Switch
> +
> +maintainers:
> +  - Prashant Malani <pmalani@...omium.org>
> +
> +description:
> +  A USB Type-C switch represents a component which routes USB Type-C data
> +  lines to various protocol host controllers (e.g USB, VESA DisplayPort,
> +  Thunderbolt etc.) depending on which mode the Type-C port, port partner
> +  and cable are operating in. It can also modify lane routing based on
> +  the orientation of a connected Type-C peripheral.
> +
> +properties:
> +  compatible:
> +    const: typec-switch
> +
> +  mode-switch:
> +    type: boolean
> +    description: Specify that this switch can handle alternate mode switching.
> +
> +  orientation-switch:
> +    type: boolean
> +    description: Specify that this switch can handle orientation switching.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    description: OF graph binding modelling data lines to the Type-C switch.
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Link between the switch and a Type-C connector.

Since you have a single port, you can omit the ports node.

> +
> +    required:
> +      - port@0
> +
> +required:
> +  - compatible
> +  - ports
> +
> +anyOf:
> +  - required:
> +      - mode-switch
> +  - required:
> +      - orientation-switch
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    drm-bridge {
> +        usb-switch {
> +            compatible = "typec-switch";
> +            mode-switch;
> +            orientation-switch;
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                port@0 {
> +                    reg = <0>;
> +                    anx_ep: endpoint {
> +                        remote-endpoint = <&typec_controller>;
> +                    };
> +                };
> +            };

So instead of ports you would have just 

               port {
                   anx_ep: endpoint {
                       remote-endpoint = <&typec_controller>;
                   };
               };

And the same simplification on patch 4, for the anx7625 dt-binding.

Thanks,
Nícolas

> +        };
> +    };
> -- 
> 2.36.1.476.g0c4daa206d-goog
>