[PATCH 1/2] dt-bindings: usb: generic-ehci: add a quirk property to avoid stuck

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>]

Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to
be getting stuck very rarely after a full/low usb device was
disconnected. To detect/recover from such a situation, the controllers
require a special way which poll the EHCI PORTSC register and changes
the OHCI functional state.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/generic-ehci.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic-ehci.yaml b/Documentation/devicetree/bindings/usb/generic-ehci.yaml
index 10edd05..c3d2dae 100644
--- a/Documentation/devicetree/bindings/usb/generic-ehci.yaml
+++ b/Documentation/devicetree/bindings/usb/generic-ehci.yaml
@@ -63,6 +63,11 @@ properties:
     description:
       Set this flag to force EHCI reset after resume.
 
+  needs-polling-to-avoid-stuck:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Set this flag to avoid getting EHCI stuck.
+
   companion:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
-- 
2.7.4