linux-kernel - Re: [PATCH v4 01/18] dt-bindings: usb: usb-hcd: Detach generic USB controller properties

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Date:   Fri, 13 Nov 2020 14:04:19 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        Roger Quadros <rogerq@...com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        "Martin Blumenstingl" <martin.blumenstingl@...glemail.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-snps-arc@...ts.infradead.org>, <linux-mips@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 01/18] dt-bindings: usb: usb-hcd: Detach generic USB
 controller properties

On Wed, 2020-11-11 at 12:08 +0300, Serge Semin wrote:
> There can be three distinctive types of the USB controllers: USB hosts,
> USB peripherals/gadgets and USB OTG, which can switch from one role to
> another. In order to have that hierarchy handled in the DT binding files,
> we need to collect common properties in a common DT schema and specific
> properties in dedicated schemas. Seeing the usb-hcd.yaml DT schema is
> dedicated for the USB host controllers only, let's move some common
> properties from there into the usb.yaml schema. So the later would be
> available to evaluate all currently supported types of the USB
> controllers.
> 
> While at it add an explicit "additionalProperties: true" into the
> usb-hcd.yaml as setting the additionalProperties/unevaluateProperties
> properties is going to be get mandatory soon.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v4:
> - This is a new patch created as a result of the comment left
>   by Chunfeng Yun in v3
> ---
>  .../devicetree/bindings/usb/usb-hcd.yaml      | 14 ++-------
>  .../devicetree/bindings/usb/usb.yaml          | 29 +++++++++++++++++++
>  2 files changed, 32 insertions(+), 11 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/usb/usb.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-hcd.yaml b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> index 7263b7f2b510..81f3ad1419d8 100644
> --- a/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> +++ b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> @@ -9,18 +9,10 @@ title: Generic USB Host Controller Device Tree Bindings
>  maintainers:
>    - Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>  
> -properties:
> -  $nodename:
> -    pattern: "^usb(@.*)?"
> +allOf:
> +  - $ref: usb.yaml#
>  
> -  phys:
> -    $ref: /schemas/types.yaml#/definitions/phandle-array
> -    description:
> -      List of all the USB PHYs on this HCD
> -
> -  phy-names:
> -    description:
> -      Name specifier for the USB PHY
> +additionalProperties: true
This seems already added by the applied patch 6a0e321ea735 "dt-bindings:
Explicitly allow additional properties in common schemas"

>  
>  examples:
>    - |
> diff --git a/Documentation/devicetree/bindings/usb/usb.yaml b/Documentation/devicetree/bindings/usb/usb.yaml
> new file mode 100644
> index 000000000000..941ad59fbac5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb.yaml
> @@ -0,0 +1,29 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/usb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic USB Controller Device Tree Bindings
> +
> +maintainers:
> +  - Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> +
> +select: false
> +
> +properties:
> +  $nodename:
> +    pattern: "^usb(@.*)?"
> +
> +  phys:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      List of all the USB PHYs on this HCD
> +
> +  phy-names:
> +    description:
> +      Name specifier for the USB PHY
> +
> +additionalProperties: true
> +
> +...