USB: document ehci-hcd's "companion" sysfs attribute
This patch (as1484) adds documentation for ehci-hcd's "companion" sysfs attribute, which was added to the kernel over four years ago but never documented. Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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