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@xxxxxxxxxxxxx> > --- > 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
