linux-kernel - [PATCH v1 1/3] dt-bindings: usb: dwc3: Add a property to reserve endpoints

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Message-ID: <20250116154117.148915-2-andriy.shevchenko@linux.intel.com>
Date: Thu, 16 Jan 2025 17:40:46 +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>,
	Ferry Toth <fntoth@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/3] 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>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 1cd0ca90127d..2ae8e5e85f78 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -109,6 +109,16 @@ properties:
   resets:
     minItems: 1
 
+  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
+    maxItems: 30
+    items:
+      minimum: 2
+      maximum: 31
+
   snps,usb2-lpm-disable:
     description: Indicate if we don't want to enable USB2 HW LPM for host
       mode.
-- 
2.43.0.rc1.1336.g36b5255a03ac