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Date:   Sun, 17 Oct 2021 14:59:03 +0200
From:   Sven Peter <>
To:     Felipe Balbi <>
Cc:     Sven Peter <>, Rob Herring <>,
        Greg Kroah-Hartman <>,
        Hector Martin <>,
        Alyssa Rosenzweig <>,
        Mark Kettenis <>,,,
Subject: [PATCH 1/2] dt-bindings: usb: dwc3: Document role-switch-reset-quirk

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 <>
 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
       True when DWC3 asserts output signal utmi_l1_suspend_n, false when

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