linux-kernel - Re: [v3 PATCH] dt-binding: usb: add usb-role-switch property

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Date:   Fri, 17 May 2019 16:27:21 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Biju Das <biju.das@...renesas.com>,
        Yu Chen <chenyu56@...wei.com>, Min Guo <min.guo@...iatek.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: Re: [v3 PATCH] dt-binding: usb: add usb-role-switch property

On Wed, May 08, 2019 at 05:17:44PM +0800, Chunfeng Yun wrote:
> Add a property usb-role-switch to tell the driver that use
> USB Role Switch framework to handle the role switch,
> it's useful when the driver has already supported other ways,
> such as extcon framework etc.
> 
> Cc: Biju Das <biju.das@...renesas.com>
> Cc: Yu Chen <chenyu56@...wei.com>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Who is meant to pick this? Can you include this in your series where
you introduce that USB Type-B GPIO connector driver?

FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> v3:
>     add property type, modify description suggested by Heikki
> 
> v2:
>     describe it in terms of h/w functionality suggested by Rob
> 
> v1:
>     the property is discussed in:
>     [v2,2/7] dt-bindings: usb: renesas_usb3: add usb-role-switch property
>     https://patchwork.kernel.org/patch/10852497/
> 
>     Mediatek and Hisilicon also try to use it:
>     [v4,3/6] dt-bindings: usb: mtu3: add properties about USB Role Switch
>     https://patchwork.kernel.org/patch/10918385/
>     [v4,6/6] usb: mtu3: register a USB Role Switch for dual role mode
>     https://patchwork.kernel.org/patch/10918367/
> 
>     [v6,10/13] usb: dwc3: Registering a role switch in the DRD code
>     https://patchwork.kernel.org/patch/10909981/
> ---
>  Documentation/devicetree/bindings/usb/generic.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
> index 0a74ab8dfdc2..cf5a1ad456e6 100644
> --- a/Documentation/devicetree/bindings/usb/generic.txt
> +++ b/Documentation/devicetree/bindings/usb/generic.txt
> @@ -30,6 +30,10 @@ Optional properties:
>  			optional for OTG device.
>   - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
>  			optional for OTG device.
> + - usb-role-switch: boolean, indicates that the device is capable of assigning
> +			the USB data role (USB host or USB device) for a given
> +			USB connector, such as Type-C, Type-B(micro).
> +			see connector/usb-connector.txt.
>  
>  This is an attribute to a USB controller such as:
>  
> -- 
> 2.21.0

thanks,

-- 
heikki