linux-kernel - Re: [PATCH v2 3/5] dt-bindings: usb: xhci: Add 'write-64-hi-lo-quirk' quirk

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Date: Tue, 4 Jun 2024 00:30:32 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Jung Daehwan <dh10.jung@...sung.com>
CC: Krzysztof Kozlowski <krzk@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE  TREE BINDINGS" <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] dt-bindings: usb: xhci: Add 'write-64-hi-lo-quirk'
 quirk

On Mon, Jun 03, 2024, Jung Daehwan wrote:
> 
> This issue is not specific on SoC side but dwc3 controller. I think it's
> better to add it to dwc3 directly but I can't find dts for dwc3. Dts for
> SoC, which uses dwc3 would be needed in this case, right?
> 

This quirk applies across different DWC_usb3x versions. IMO, you can
just pass the xhci quirk flag along the dwc3_xhci_plat_quirk->quirks
without needing to introduce a new xhci DTS binding. However, to do
this, you should extract the xhci quirk flags to a separate header so
that dwc3 can include and use them.

BR,
Thinh