linux-kernel - [PATCH v3 2/3] dt-bindings: usb: snps,dwc3: Add allow-rtsusp-on-u3 property

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Message-Id: <20230711174320.24058-3-quic_eserrao@quicinc.com>
Date:   Tue, 11 Jul 2023 10:43:19 -0700
From:   Elson Roy Serrao <quic_eserrao@...cinc.com>
To:     Thinh.Nguyen@...opsys.com, stern@...land.harvard.edu
Cc:     gregkh@...uxfoundation.org, rogerq@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        quic_wcheng@...cinc.com, quic_jackp@...cinc.com,
        Elson Roy Serrao <quic_eserrao@...cinc.com>
Subject: [PATCH v3 2/3] dt-bindings: usb: snps,dwc3: Add allow-rtsusp-on-u3 property

This property allows dwc3 runtime suspend when bus suspend interrupt
is received even with cable connected. This would allow the dwc3
controller to enter low power mode during bus suspend scenario.

This property would particularly benefit dwc3 IPs where hibernation is
not enabled and the dwc3 low power mode entry/exit is handled by the
glue driver. The assumption here is that the platform using this dt
property is capable of detecting resume events to bring the controller
out of suspend.

Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index a696f23730d3..18ad99a26dd9 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -403,6 +403,11 @@ properties:
     description:
       Enable USB remote wakeup.
 
+  snps,allow-rtsusp-on-u3:
+    description:
+      If True then dwc3 runtime suspend is allowed during bus suspend
+      case even with the USB cable connected.
+
 unevaluatedProperties: false
 
 required:
-- 
2.17.1