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

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Date: Fri, 31 May 2024 15:07:35 +0900
From: Daehwan Jung <dh10.jung@...sung.com>
To: 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>
Cc: linux-usb@...r.kernel.org (open list:USB SUBSYSTEM),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE
	TREE BINDINGS), linux-kernel@...r.kernel.org (open list), Daehwan Jung
	<dh10.jung@...sung.com>
Subject: [PATCH v2 3/5] dt-bindings: usb: xhci: Add 'write-64-hi-lo-quirk'
 quirk

xHCI specification 5.1 "Register Conventions" states that 64 bit
registers should be written in low-high order. All writing operations
in xhci is done low-high order following the spec.

Add a new quirk to support workaround for high-low order.

Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
---
 Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
index 4238ae8..447d331 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
@@ -25,6 +25,10 @@ properties:
     description: Set if the controller has broken port disable mechanism
     type: boolean
 
+  write-64-hi-lo-quirk:
+    description: Set if the controller has a limitation of high-low order
+    type: boolean
+
   imod-interval-ns:
     description: Interrupt moderation interval
     default: 5000
-- 
2.7.4