linux-kernel - Re: [PATCH v3 1/3] dt-bindings: usb: dwc3: Add support for multiport related properties

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Date:   Thu, 9 Jun 2022 09:38:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Harsh Agarwal <quic_harshq@...cinc.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com, quic_jackp@...cinc.com,
        ahalaney@...hat.com
Subject: Re: [PATCH v3 1/3] dt-bindings: usb: dwc3: Add support for multiport
 related properties

On Wed, Jun 08, 2022 at 11:06:25PM +0530, Harsh Agarwal wrote:
> Added support for multiport, mport, num_usb2_phy and num_usb3_phy
> properties. These properties are used to support devices having
> a multiport controller.
> 
> Signed-off-by: Harsh Agarwal <quic_harshq@...cinc.com>
> ---
>  .../devicetree/bindings/usb/snps,dwc3.yaml         | 53 ++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index d41265b..9332fa2 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -343,6 +343,32 @@ properties:
>        This port is used with the 'usb-role-switch' property  to connect the
>        dwc3 to type C connector.
>  
> +  multiport:

Again, I don't think this is going to play well if you need to describe 
USB devices in your DT. For example, a USB hub with additional DT 
properties.

> +    description:
> +      If a single USB controller supports multiple ports, then it's referred to as
> +      a multiport controller. Each port of the multiport controller can support
> +      either High Speed or Super Speed or both and have their own PHY phandles. Each
> +      port is represented by "mport" node and all the "mport" nodes are grouped
> +      together inside the "multiport" node where individual "mport" node defines the
> +      PHYs supported by that port.
> +
> +  num_usb2_phy:
> +    description: Total number of HS-PHYs defined by the multiport controller.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  num_usb3_phy:
> +    description: Total number of SS-PHYs defined by the multiport controller.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  mport:
> +    description: Each mport node represents one port of the multiport controller.
> +    oneOf:
> +      - required:
> +        - usb-phy

This is deprecated. Why are you adding it?

> +      - required:
> +        - phys
> +        - phy-names

Other multi port USB hosts just have a list of phys. Why can't you just 
use phy-names to identify each phy:

phy-names = "port0-hs", "port0-ss", "port1-hs", "port1-ss", "port2-hs", 
  "port3-hs";

Rob