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

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Message-ID: <CANAwSgQ6H9FUEBKz7sCf4kUZSMnCfyXG-cpGTMZoT15W9187Kg@mail.gmail.com>
Date:   Sun, 19 Nov 2023 20:57:28 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Conor Dooley <conor@...nel.org>
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

Hi Conor,

On Sun, 19 Nov 2023 at 19:28, Conor Dooley <conor@...nel.org> wrote:
>
> 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.
>
Ok, GL3523 integrates Genesys Logic self-developed USB 3.1 Gen 1
Super Speed transmitter/receiver physical layer (PHY) and USB 2.0
High-Speed PHY

peer-hub is used to cross-connect those phy nodes so that it can help
hub power on/off simultaneously.

/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci-hcd/2p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
        ID 05e3:0610 Genesys Logic, Inc. Hub
        |__ Port 003: Dev 004, If 0, Class=Vendor Specific Class,
Driver=cp210x, 12M
            ID 10c4:ea60 Silicon Labs CP210x UART Bridge
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 5000M
        ID 05e3:0620 Genesys Logic, Inc. GL3523 Hub
        |__ Port 001: Dev 003, If 0, Class=Mass Storage,
Driver=usb-storage, 5000M
            ID 174c:55aa ASMedia Technology Inc. ASM1051E SATA 6Gb/s
bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge,
ASM1153E SATA 6Gb/s bridge

Thanks
-Anand

> 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
> >