linux-kernel - [PATCH 4.14 126/164] dt-bindings: usb: fix reg-property port-number range

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Date:   Tue, 12 Dec 2017 13:45:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 126/164] dt-bindings: usb: fix reg-property port-number range

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>


[ Upstream commit f42ae7b0540937e00fe005812997f126aaac4bc2 ]

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>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Documentation/devicetree/bindings/usb/usb-device.txt |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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: