[1/2] dt-bindings: usb: add "hub,interval" property
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Message ID 20191117033230.259647-1-ikjn@chromium.org
State New
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Series
  • usb: override hub device bInterval with device node
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Commit Message

Ikjoon Jang Nov. 17, 2019, 3:32 a.m. UTC
Add "hub,interval" property to usb-device, so hub device can override
endpoint descriptor's bInterval.

Some existing hub devices have adjustable interval so the device is
allowed to use different bInterval. This is useful when the hub's default
bInterval is too big, so child device's waking up from autosuspend
takes much time.

Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
---
 Documentation/devicetree/bindings/usb/usb-device.txt | 4 ++++
 1 file changed, 4 insertions(+)

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt
index 036be172b1ae..44bef2ff2704 100644
--- a/Documentation/devicetree/bindings/usb/usb-device.txt
+++ b/Documentation/devicetree/bindings/usb/usb-device.txt
@@ -66,6 +66,9 @@  Required properties for host-controller nodes with device nodes:
 - #size-cells: shall be 0
 
 
+Optional properties for hub nodes
+- hub,interval: bInterval of status change endpoint. The range is 1-255.
+
 Example:
 
 &usb1 {	/* host controller */
@@ -75,6 +78,7 @@  Example:
 	hub@1 {		/* hub connected to port 1 */
 		compatible = "usb5e3,608";
 		reg = <1>;
+		hub,interval = <8>;
 	};
 
 	device@2 {	/* device connected to port 2 */