linux-kernel - [PATCH 1/2] dt-bindings: usb: xhci: Allow "iommus" and "dr

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Message-ID: <20250919223433.2399927-1-robh@kernel.org>
Date: Fri, 19 Sep 2025 17:34:31 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: usb: xhci: Allow "iommus" and "dr_mode" properties

Allow "iommus" property as it's reasonable for any XHCI controller to be
behind an IOMMU. Allow "dr_mode" as an XHCI controller can be part of a
dual-role controller.

In particular, the Marvell Armada 8K XHCI controller uses both of these
properties.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 Documentation/devicetree/bindings/usb/generic-xhci.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic-xhci.yaml b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
index a2b94a138999..8875911b43cc 100644
--- a/Documentation/devicetree/bindings/usb/generic-xhci.yaml
+++ b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
@@ -53,6 +53,14 @@ properties:
 
   dma-coherent: true
 
+  dr_mode:
+    enum:
+      - host
+      - otg
+
+  iommus:
+    maxItems: 1
+
   power-domains:
     maxItems: 1
 
-- 
2.51.0