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    ACPI: Allow ACPI binding with USB-3.0 hub · 1033f904
    Lan Tianyu 提交于
    A USB port's position and connectability can't be identified on some boards
    via USB hub registers. ACPI _UPC and _PLD can help to resolve this issue
    and so it is necessary to bind USB with ACPI. This patch is to allow ACPI
    binding with USB-3.0 hub.
    
    Current ACPI only can bind one struct-device to one ACPI device node.
    This can not work with USB-3.0 hub, because the USB-3.0 hub has two logical
    devices. Each works for USB-2.0 and USB-3.0 devices. In the Linux USB subsystem,
    those two logical hubs are treated as two seperate devices that have two struct
    devices. But in the ACPI DSDT, these two logical hubs share one ACPI device
    node. So there is a requirement to bind multi struct-devices to one ACPI
    device node. This patch is to resolve such problem.
    
    Following is the ACPI device nodes' description under xhci hcd.
    
    Device (XHC)
                Device (RHUB)
                    Device (HSP1)
                    Device (HSP2)
                    Device (HSP3)
                    Device (HSP4)
                    Device (SSP1)
                    Device (SSP2)
                    Device (SSP3)
                    Device (SSP4)
    
    Topology in the Linux
    
    	device XHC
    	   USB-2.0 logical hub    USB-3.0 logical hub
    		HSP1			SSP1
    		HSP2			SSP2
    		HSP3			SSP3
    		HSP4			SSP4
    
    This patch also modifies the output of /proc/acpi/wakeup. One ACPI node
    can be associated with multiple devices:
    
    XHC		S4	*enabled	pci:0000:00:14.0
    RHUB	S0	disabled	usb:usb1
    			disabled	usb:usb2
    Signed-off-by: NLan Tianyu <tianyu.lan@intel.com>
    Acked-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
    Signed-off-by: NLen Brown <len.brown@intel.com>
    1033f904
proc.c 11.1 KB