linux-kernel - [PATCH 1/2] dt-bindings: usb: add "hub,interval" property

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Date:   Sun, 17 Nov 2019 11:32:30 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Suwan Kim <suwan.kim027@...il.com>,
        "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        Johan Hovold <johan@...nel.org>,
        Nicolas Boitchat <drinkcat@...omium.org>,
        Ikjoon Jang <ikjn@...omium.org>
Subject: [PATCH 1/2] dt-bindings: usb: add "hub,interval" property

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@...omium.org>
---
 Documentation/devicetree/bindings/usb/usb-device.txt | 4 ++++
 1 file changed, 4 insertions(+)

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 */
-- 
2.24.0.432.g9d3f5f5b63-goog