Re: [PATCH 4/4] usb: register usb port to usb_bus_type

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On 2013/3/29 2:44, Alan Stern wrote:
On Thu, 28 Mar 2013, Greg KH wrote:

ls /sys/bus/usb/devices
1-0:1.0    2-0:1.0  port1-1      port1-1.3  port2-1.2  port2-2  port4-3
1-1        2-1      port1-1.1    port1-1.4  port2-1.3  port3-1  port4-4
1-1.1      2-1:1.0  port1-1.2    port1-1.5  port2-1.4  port3-2  usb1
1-1:1.0    3-0:1.0  port1-1.2.1  port1-1.6  port2-1.5  port3-3  usb2
1-1.1:1.0  3-1      port1-1.2.2  port1-2    port2-1.6  port3-4  usb3
1-1.2      3-1:1.0  port1-1.2.3  port2-1    port2-1.7  port4-1  usb4
1-1.2:1.0  4-0:1.0  port1-1.2.4  port2-1.1  port2-1.8  port4-2

What does it look like if you reverse the naming scheme (hub dev name +
"port")?  Doesn't that show the devices in a bit more logical way?
Hi Greg:
	Do you mean e.g "port1.2-1", originally it's "port2-1.1".
2-1 is hub dev name?

No, I mean "2-1.port1" as these are the ports on the device, the device
prefix should go first, right?

	If right, how about root hub port and it should be port2.usb1?

"usb1.port2"

Is this a good idea?  There are userspace programs that look through
the list of files in /sys/bus/usb/devices, and they probably expect
filenames beginning with a number or with 'usb' to be USB devices and
After updating

ls /sys/bus/usb/devices
1-0:1.0  1-1.1:1.0  1-1.4      1-1.port3  2-1:1.0    2-1.6      2-1.port2  2-1.port6  usb1.port1  usb2.port1  usb3.port1  usb4 usb4.port4
1-1      1-1.1:1.1  1-1.4:1.0  1-1.port4  2-1.5      2-1.6:1.0 2-1.port3  3-0:1.0    usb1.port2  usb2.port2  usb3.port2  usb4.port1
1-1.1    1-1.2      1-1.port1  2-0:1.0    2-1.5:1.0  2-1.6:1.1 2-1.port4  4-0:1.0    usb1.port3  usb2.port3  usb3.port3  usb4.port2
1-1:1.0  1-1.2:1.0  1-1.port2  2-1        2-1.5:1.1  2-1.port1 2-1.port5  usb1       usb2        usb3        usb3.port4  usb4.port3
interfaces.

Alan Stern


--
Best Regards
Tianyu Lan
linux kernel enabling team
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