linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: dwc3: Document role-switch-reset-quirk

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Date:   Tue, 26 Oct 2021 18:25:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: dwc3: Document
 role-switch-reset-quirk

On Sun, Oct 17, 2021 at 02:59:03PM +0200, Sven Peter wrote:
> The dwc3 controller on the Apple M1 must be reset whenever a
> device is unplugged from the root port and triggers a role
> switch notification. Document the quirk to enable this behavior.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 25ac2c93dc6c..9635e20cab68 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -226,6 +226,12 @@ properties:
>        avoid -EPROTO errors with usbhid on some devices (Hikey 970).
>      type: boolean
>  
> +  snps,role-switch-reset-quirk:
> +    description:
> +      When set, DWC3 will be reset and reinitialized whenever a role switch
> +      is performed.
> +    type: boolean

This binding is a example of why we don't do a property per quirk. We 
end up with a gazillion of them.

Imply this from the SoC specific compatible (I don't recall seeing one 
for the M1, so that's a problem).

Rob