From: Ikjoon Jang <ikjn@chromium.org>
To: devicetree@vger.kernel.org
Cc: GregKroah-Hartman <gregkh@linuxfoundation.org>,
RobHerring <robh+dt@kernel.org>,
MarkRutland <mark.rutland@arm.com>,
AlanStern <stern@rowland.harvard.edu>,
SuwanKim <suwan.kim027@gmail.com>,
"GustavoA . R . Silva" <gustavo@embeddedor.com>,
IkjoonJang <ikjn@chromium.org>, JohanHovold <johan@kernel.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
drinkcat@chromium.org
Subject: [PATCH v4 1/2] dt-bindings: usb: add "hub,interval" property
Date: Tue, 3 Dec 2019 18:15:36 +0800 [thread overview]
Message-ID: <20191203101536.199222-1-ikjn@chromium.org> (raw)
Add "hub,interval" property to usb-device, so hub device can override
endpoint descriptor's bInterval.
When we know reducing autosuspend delay for built-in HIDs is better for
power saving, we can reduce it to the optimal value. But if a parent hub
has a long bInterval, mouse lags a lot from more frequent autosuspend.
So this enables overriding bInterval for a hard wired hub device only
when we know that reduces the power consumption.
Signed-off-by: Ikjoon Jang <ikjn@chromium.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 */
--
2.24.0.393.g34dc348eaf-goog
next reply other threads:[~2019-12-03 10:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 10:15 Ikjoon Jang [this message]
2019-12-16 15:38 ` [PATCH v4 1/2] dt-bindings: usb: add "hub,interval" property Rob Herring
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