linux-kernel - [PATCH v3 1/4] dt-bindings: usb: dwc3: Add a property to reserve endpoints

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Message-ID: <20250212193116.2487289-2-andriy.shevchenko@linux.intel.com>
Date: Wed, 12 Feb 2025 21:28:01 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Felipe Balbi <balbi@...nel.org>,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Ferry Toth <fntoth@...il.com>
Subject: [PATCH v3 1/4] dt-bindings: usb: dwc3: Add a property to reserve endpoints

Some of the endpoints may be reserved by hardware for different purposes,
e.g., tracing control and output. This is the case, for instance, on
Intel Merrifield and Moorefield platforms that reserve a few and USB driver
may not use them for the regular transfers. Add the respective bindings.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Tested-by: Ferry Toth <fntoth@...il.com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
---
 .../devicetree/bindings/usb/snps,dwc3-common.yaml     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
index c956053fd036..71249b6ba616 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
@@ -65,6 +65,17 @@ properties:
       mode.
     type: boolean
 
+  snps,reserved-endpoints:
+    description:
+      Reserve endpoints for other needs, e.g, for tracing control and output.
+      When set, the driver will avoid using them for the regular USB transfers.
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    minItems: 1
+    maxItems: 30
+    items:
+      minimum: 2
+      maximum: 31
+
   snps,dis-start-transfer-quirk:
     description:
       When set, disable isoc START TRANSFER command failure SW work-around
-- 
2.45.1.3035.g276e886db78b