linux-kernel - [PATCH v1 1/2] dt-bindings: usb: snps,dwc3: Add property for imod

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Message-ID: <20250202035100.31235-1-badhri@google.com>
Date: Sun,  2 Feb 2025 03:50:59 +0000
From: Badhri Jagan Sridharan <badhri@...gle.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org, 
	felipe.balbi@...ux.intel.com, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, johnyoun@...opsys.com
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, jameswei@...gle.com, 
	Badhri Jagan Sridharan <badhri@...gle.com>, stable@...nel.org
Subject: [PATCH v1 1/2] dt-bindings: usb: snps,dwc3: Add property for imod

This change adds `snps,device-mode-intrpt-mod-interval`
which allows enabling interrupt moderation through
snps,dwc3 node.

`snps,device-mode-intrpt-mod-interval`specifies the
minimum inter-interrupt interval in 250ns increments
during device mode operation. A value of 0 disables
the interrupt throttling logic and interrupts are
generated immediately if event count becomes non-zero.
Otherwise, the interrupt is signaled when all of the
following conditons are met which are, EVNT_HANDLER_BUSY
is 0, event count is non-zero and at least 250ns increments
of this value has elapsed since the last time interrupt
was de-asserted.

Cc: stable@...nel.org
Fixes: cf40b86b6ef6 ("usb: dwc3: Implement interrupt moderation")
Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
 .../devicetree/bindings/usb/snps,dwc3-common.yaml   | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
index c956053fd036..3957f1dac3c4 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
@@ -375,6 +375,19 @@ properties:
     items:
       enum: [1, 4, 8, 16, 32, 64, 128, 256]
 
+  snps,device-mode-intrpt-mod-interval:
+    description:
+      Specifies the minimum inter-interrupt interval in 250ns increments
+      during device mode operation. A value of 0 disables the interrupt
+      throttling logic and interrupts are generated immediately if event
+      count becomes non-zero. Otherwise, the interrupt is signaled when
+      all of the following conditons are met which are, EVNT_HANDLER_BUSY
+      is 0, event count is non-zero and at least 250ns increments of this
+      value has elapsed since the last time interrupt was de-asserted.
+    $ref: /schemas/types.yaml#/definitions/uint16
+    minimum: 0
+    maximum: 255
+
   num-hc-interrupters:
     maximum: 8
     default: 1

base-commit: 72deda0abee6e705ae71a93f69f55e33be5bca5c
-- 
2.48.1.362.g079036d154-goog