linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: Add binding for onboard USB hubs

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Message-ID: <20200915142145.GA1861636@bogus>
Date:   Tue, 15 Sep 2020 08:21:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frank Rowand <frowand.list@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        linux-usb@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        devicetree@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Peter Chen <peter.chen@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: Add binding for onboard USB hubs

On Mon, Sep 14, 2020 at 11:27:48AM -0700, Matthias Kaehlcke wrote:
> Onboard USB hubs need to be powered and may require initiaization of
> other resources (like GPIOs or clocks) to work properly. This adds
> a device tree binding for these hubs.

We already have bindings for these. 2 in fact as I2C controlled hubs are 
often described under the I2C bus.

> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> 
>  .../bindings/usb/onboard_usb_hub.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> new file mode 100644
> index 000000000000..f82d8f459eed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/onboard_usb_hub.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binding for onboard USB hubs
> +
> +maintainers:
> +  - Matthias Kaehlcke <mka@...omium.org>
> +
> +allOf:
> +  - $ref: /schemas/usb/onboard_usb_hub.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - onboard-usb-hub
> +      - realtek,rts5411
> +
> +  power-off-in-suspend:
> +    description:
> +      The hub should be powered off during system suspend. When the
> +      "wakeup-source" property is also provided the hub is only powered
> +      off during suspend when no wakeup capable descendants are connected.
> +    type: boolean
> +
> +  vdd-supply:
> +    description:
> +      phandle to the regulator that provides power to the hub.
> +
> +  wakeup-source:
> +    description:
> +      Wakeup capable USB devices connected to this hub can be used as
> +      wakeup source.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - vdd-supply
> +
> +examples:
> +  - |
> +    usb_hub: usb-hub {
> +        compatible = "realtek,rts5411", "onboard-usb-hub";
> +        vdd-supply = <&pp3300_hub>;
> +        power-off-in-suspend;
> +        wakeup-source;

This is the hub device?

> +    };
> +
> +    &usb_1_dwc3 {
> +	dr_mode = "host";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	/* 2.0 hub on port 1 */
> +	hub@1 {
> +		compatible = "usbbda,5411";
> +		reg = <1>;
> +		hub = <&usb_hub>;

Or this node is?

> +	};
> +
> +	/* 3.0 hub on port 2 */
> +	hub@2 {
> +		compatible = "usbbda,411";
> +		reg = <2>;
> +		hub = <&usb_hub>;

Or this node is?

The hub node belongs here.

If you really have it connected to 2 upstream ports, then just do 
one node with 'reg = <1 2>;'.

Rob

> +	};
> +
> +...
> -- 
> 2.28.0.618.gf4bc123cb7-goog
>