linux-kernel - [PATCH 2/8] dt-bindings: usb: fix reg-property port-number range

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Date:   Thu,  9 Nov 2017 18:07:17 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Alan Stern <stern@...land.harvard.edu>,
        Peter Chen <peter.chen@....com>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 2/8] dt-bindings: usb: fix reg-property port-number range

The USB hub port-number range for USB 2.0 is 1-255 and not 1-31 which
reflects an arbitrary limit set by the current Linux implementation.

Note that for USB 3.1 hubs the valid range is 1-15.

Increase the documented valid range in the binding to 255, which is the
maximum allowed by the specifications.

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 Documentation/devicetree/bindings/usb/usb-device.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt
index 4df7e22e0084..b749fb9f2674 100644
--- a/Documentation/devicetree/bindings/usb/usb-device.txt
+++ b/Documentation/devicetree/bindings/usb/usb-device.txt
@@ -11,7 +11,7 @@ Required properties:
   be used, but a device adhering to this binding may leave out all except
   for usbVID,PID.
 - reg: the port number which this device is connecting to, the range
-  is 1-31.
+  is 1-255.
 
 Example:
 
-- 
2.15.0