linux-kernel - Re: [RFC v4 1/5] dt-bindings: usb: Add bindings to support multiport properties

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Date:   Mon, 16 Jan 2023 10:34:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com, quic_wcheng@...cinc.com,
        quic_jackp@...cinc.com, quic_harshq@...cinc.com
Subject: Re: [RFC v4 1/5] dt-bindings: usb: Add bindings to support multiport
 properties

On Sun, Jan 15, 2023 at 05:11:42PM +0530, Krishna Kurapati wrote:
> Add bindings to indicate properties required to support multiport
> on Snps Dwc3 controller.
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  .../devicetree/bindings/usb/snps,dwc3.yaml    | 53 ++++++++++++++++---
>  1 file changed, 47 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 6d78048c4613..3ea051beb2f8 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -81,15 +81,26 @@ properties:
>  
>    phys:
>      minItems: 1
> -    maxItems: 2
> +    maxItems: 8
>  
>    phy-names:
>      minItems: 1
> -    maxItems: 2
> -    items:
> -      enum:
> -        - usb2-phy
> -        - usb3-phy
> +    maxItems: 8
> +    oneOf:
> +    - items:
> +        enum:
> +          - usb2-phy
> +          - usb3-phy
> +    - items:
> +        enum:
> +          - usb2-phy_port0
> +          - usb2-phy_port1
> +          - usb2-phy_port2
> +          - usb2-phy_port3
> +          - usb3-phy_port0
> +          - usb3-phy_port1
> +          - usb3-phy_port2
> +          - usb3-phy_port3

usbN-portM

>  
>    resets:
>      minItems: 1
> @@ -360,6 +371,22 @@ properties:
>      description:
>        Enable USB remote wakeup.
>  
> +  num-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      This property indicates the number of ports present on the target that
> +      are to be serviced by the DWC3 controller.
> +    minimum: 1
> +    maximum: 4
> +
> +  num-ss-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      This property indicates the number of SS capable ports present on the
> +      target that are to be serviced by the DWC3 controller.
> +    minimum: 1
> +    maximum: 4

This information is redundant. 'phy-names' tells you how many ports of 
each.

> +
>  unevaluatedProperties: false
>  
>  required:
> @@ -388,4 +415,18 @@ examples:
>        snps,dis_u2_susphy_quirk;
>        snps,dis_enblslpm_quirk;
>      };
> +  - |
> +    usb@...00000 {
> +      compatible = "snps,dwc3";
> +      reg = <0x4a000000 0xcfff>;
> +      interrupts = <0 92 4>;
> +      clocks = <&clk 1>, <&clk 2>, <&clk 3>;
> +      clock-names = "bus_early", "ref", "suspend";
> +      num-ports = <2>;
> +      num-ss-ports = <1>;
> +      phys = <&usb2_phy0>, <&usb3_phy0>, <&usb2_phy1>;
> +      phy-names = "usb2-phy_port0", "usb3-phy_port0", "usb2-phy_port1";
> +      snps,dis_u2_susphy_quirk;
> +      snps,dis_enblslpm_quirk;
> +    };

Does a different number of phys really need its own example?

Rob