linux-kernel - Re: [PATCH v3 1/2] dt-bindings: usb: Add the binding example for the Genesys Logic GL3523 hub

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Date:   Sun, 19 Nov 2023 13:58:00 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Icenowy Zheng <uwu@...nowy.me>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: usb: Add the binding example for the
 Genesys Logic GL3523 hub

On Sun, Nov 19, 2023 at 08:04:50AM +0530, Anand Moon wrote:
> Add the binding example for the USB3.1 Genesys Logic GL3523
> integrates with USB 3.1 Gen 1 Super Speed and USB 2.0 High-Speed
> hub.

But no comment in the commit message about the new property for the
"peer hub". $subject saying "dt-bindings: usb: Add the binding example
for the Genesys Logic GL3523 hub" is misleading when the meaningful
parts of the patch are unrelated to the example.

> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> V3: fix the dt_binding_check error, added new example for Genesys GL3523
> v2: added Genesys GL3523 binding
> v1: none
> ---
>  .../bindings/usb/genesys,gl850g.yaml          | 63 +++++++++++++++++--
>  1 file changed, 59 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> index ee08b9c3721f..f8e88477fa11 100644
> --- a/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> +++ b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> @@ -9,9 +9,6 @@ title: Genesys Logic USB hub controller
>  maintainers:
>    - Icenowy Zheng <uwu@...nowy.me>
>  
> -allOf:
> -  - $ref: usb-device.yaml#
> -
>  properties:
>    compatible:
>      enum:
> @@ -27,12 +24,44 @@ properties:
>  
>    vdd-supply:
>      description:
> -      the regulator that provides 3.3V core power to the hub.
> +      phandle to the regulator that provides power to the hub.
> +
> +  peer-hub:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      phandle to the peer hub on the controller.

What is this, why is it needed? Please explain it in your commit
message.

Thanks,
Conor.

>  
>  required:
>    - compatible
>    - reg
>  
> +allOf:
> +  - $ref: usb-device.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - usb5e3,608
> +    then:
> +      properties:
> +        peer-hub: false
> +        vdd-supply: false
> +        reset-gpios: true
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - usb5e3,610
> +              - usb5e3,620
> +    then:
> +      properties:
> +        peer-hub: true
> +        vdd-supply: true
> +        reset-gpios: true
> +
>  additionalProperties: false
>  
>  examples:
> @@ -49,3 +78,29 @@ examples:
>              reset-gpios = <&pio 7 2 GPIO_ACTIVE_LOW>;
>          };
>      };
> +
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    usb {
> +        dr_mode = "host";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        /* 2.0 hub on port 1 */
> +        hub_2_0: hub@1 {
> +            compatible = "usb5e3,610";
> +            reg = <1>;
> +            peer-hub = <&hub_3_0>;
> +            reset-gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
> +            vdd-supply = <&vcc_5v>;
> +        };
> +
> +        /* 3.1 hub on port 4 */
> +        hub_3_0: hub@2 {
> +            compatible = "usb5e3,620";
> +            reg = <2>;
> +            peer-hub = <&hub_2_0>;
> +            reset-gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
> +            vdd-supply = <&vcc_5v>;
> +        };
> +    };
> -- 
> 2.42.0
> 

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