linux-kernel - Re: [PATCH v4 1/2] dt-bindings: usb: Add binding for discrete onboard USB hubs

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Message-ID: <20200929201701.GA1080459@bogus>
Date:   Tue, 29 Sep 2020 15:17:01 -0500
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>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Bastien Nocera <hadess@...ess.net>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org, Peter Chen <peter.chen@....com>
Subject: Re: [PATCH v4 1/2] dt-bindings: usb: Add binding for discrete
 onboard USB hubs

On Mon, Sep 28, 2020 at 10:13:54AM -0700, Matthias Kaehlcke wrote:
> Discrete onboard USB hubs (an example for such a hub is the Realtek
> RTS5411) need to be powered and may require initialization of other
> resources (like GPIOs or clocks) to work properly. This adds a device
> tree binding for these hubs.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> 
> (no changes since v3)
> 
> Changes in v3:
> - updated commit message
> - removed recursive reference to $self
> - adjusted 'compatible' definition to support multiple entries
> - changed USB controller phandle to be a node
> 
> Changes in v2:
> - removed 'wakeup-source' and 'power-off-in-suspend' properties
> - consistently use spaces for indentation in example
> 
>  .../bindings/usb/onboard_usb_hub.yaml         | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> new file mode 100644
> index 000000000000..c9783da3e75c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
> +%YAML 1.2
> +---
> +$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>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - realtek,rts5411
> +      - const: onboard-usb-hub
> +
> +  vdd-supply:
> +    description:
> +      phandle to the regulator that provides power to the hub.
> +
> +required:
> +  - compatible
> +  - vdd-supply
> +
> +examples:
> +  - |
> +    usb_hub: usb-hub {
> +        compatible = "realtek,rts5411", "onboard-usb-hub";
> +        vdd-supply = <&pp3300_hub>;
> +    };

As I said in prior version, this separate node and 'hub' phandle is not 
going to work. You are doing this because you want a platform driver for 
"realtek,rts5411". That may be convenient for Linux, but doesn't reflect 
the h/w.

Rob